Hydrologic report for St. Lucie County and preferred database development

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Technical Memorandum EMA # 401 HI-ydrologic Report for St. Lucie County and Preferred Database Development January 2002 by John H. Raymond Environmental Monitoring and Assessment Department Hydrology and Hydraulics Division South Florida Water Management District 3301 Gun Club Road West Palm Beach, FL 33406

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EXECUTIVE SUMMARY This report presents a summary of the hydrometeorologic data (rainfall, evaporation, stage and flow) for St. Lucic County available from the South Florida Water Management District Corporate Database DBHYDRO. A good set of continuous data existing for each site, or preferred data set, is also developed. Prefen-ed dbkeys (database identification key) are assigned to store these preferred data sets in DBHYDRO. Procedures are presented for selecting and developing each preferred data set. Selection of climatic data sites is based on spatial and temporal distribution. Four rainfall stations out of 27 and two pan evaporation stations out of five have been selected to better describe the rainfall and evaporation distribution in the area. Monthly and yearly statistics (mean, median, standard deviation, maximum and minimum values) for the seleclted stations, as well as monthly and yearly areal rainfall for the county (tabular and graphical formats), are reported. Wet season, as depicted from the areal rainfall, goes from June to October and accounts for 61 percent (32.38 inches) of the total annual mean rainfall (52.74 inches). September is the wettest month with a mean monthly rainfall of 7.68 inches. Drought periods have been observed in the county during the 86-year period of record (19141999). The wettest and driest years were 1947 (77.76 inches) and 1917 (32.05 inches), respectively. More than 70 percent of the evaporation occurs during the period March to September. Mean monthly pan evaporation values vary from 5.10 to 5.32 inches in the two selected pan evaporation sites, while mean annual values vary from 61.20 to 63.89 inches. Flow data are presented for three major structures, namely S-49, S-50 and S-99, while stage data are presented For most of the major canals and structures located in the county (C-23, C-25, G-78, G-79, G-81, S-49, S-50 and S-99). Historical daily data and corresponding monthly and annual statistics are also presented. Rainfall plays a major role in the St. Lucie hydrologic system. The C-23, C-24 and C-25 drainage basins (53 percent being in St. Lucie County) drain an average of 1.4 million acre-feet annually, with 70 percent going into groundwater storage and consumptive use (irrigation, water supply), and the remaining 30 percent leaving the system through structures S-49, S-97 and S-99. A rainfall-runoff model presented for the three drainage basins depicts a poor relationship (r2 = 0.56). However a strong relationship (r? = 0.99) is found in plotting a double mass curve for cumulative runoff and rainfall, which shows that the rainfall-runoff relationship is relatively constant through the years.

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ACIKNOWLEDGEMENTS The author would like to thank the following District staff for reviewing the drafts of this report: Wossenu AbLew, Susan Bennett, Emile Damisse, Scott lluebner, Nagendra Khanal, Ken Konyha, Davies Mtundu, Chandra Pathak, and Robb Startzman.

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TABLE OF CONTENTS E X E C U T IV E SU M M A R Y ...................................................................... ......................... ACKNOWLEDGEMENTS ................... ............................................ii.... u TA BLE O F C O N TEN T S ..................................................... ............................................ LIST O F T A BL ES ..................................................................................................... v LIST O F FIG UR ES ............... .............................................................. vi 1. INTRODUCTION................................................................. 1 2. CLIM ATIC DATA ........................................................... ........ .......... .... 4 2.1 E X IST IN G D A T A .................................................................................... 4 2.1.1 R ainfall .....;...................................................................................... 4 2.1.2 E vaporation ........................................................................ ......... 4 2.1.3 Other Climatic Data .......................................... ................. 4 2.2 METHODOLOGY .................................... 4 2.2.1 Station and Site Selection .......................................................9......... 2.2.2 Q A /Q C ............................................................. .......................... 10 2.2.3 Estim ating Areal Rainfall ......................................................... .12 2.3 SUMMARY OF CLIMATIC DATA ................................. ......... 14 2.3.1 R ainfall .......................... ...... .......... ...................................... .. 14 2.3.2 Evaporation ...................... ............................ 14 3. SURFACE WATER DATA ........................................................ .. ..... ..... 21 3.1 EX ISTIN G D ATA ............................................. .......... ........... 21 3.1.1 Flow ........................................................ 21 3.1.2 Stage ............................................................................................. 25 3.2 M ETHODOLOG Y ............................ .............................................. 25 3.2.1 Station and Site Selection............................................................. 25 3.2.2 Q A /Q C ............................................................. .............. ........... 28 3.3 SUMMARY OF SURFACE WATER DATA ........................................ 28 3.3.1 F low .............................................................. ......................... 28 3.3 .2 S tage .................................... ......... ............................................ 35 3.4 HYDROLOGIC SYSTEM AND WATER BUDGET ............................42 4. S U M M A R Y ............................................ ............................................... ............. 46 R EFER EN C E S ............................................................... ............. ...... ..........48 iii

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APPENDICES APPENDIX APPENDIX APPENDIX APPENDIX APPENDIX APPENDIX APPENDIX APPENDIX ..................................................................... ............ .. ,.... ............ 4 9 A: Historical Rainfall Data ................................... .................50 B: Monthly and Annual Rainfall Statistics................. 55 C : Historical Evaporation D ata ........................................................63 D: Monthly and Annual Evaporation Statistics ............................. 66 E: Historical Daily Flow Data ....................................................... 69 F: Monthly and Annual Flow Data Statistics ................................ 72 G: Historical Daily Stage Data .....................................................76 H: Monthly and Annual Stage Data Stal.istics................................. 83

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LIST OF TABLES Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11i. Table 12. Table 13. Table BI. Table B2. Table B3. Table B4. Table B5. Table DI. Table D2. Table Fl. Table F2. Table F3. Table H1. Table H2. Table H3. Table H4. Table H5. Table H6. Table 117. Table 118. Table H9. Table H10. '.Table HI 1. 'Table HI2. annual annual annual annual annual annual annual annual annual annual annual average average average average average average average average average average average stage at C-25 (ft, NGVD) ......................... headwater stage at G-78 (ft, NGVD).......... headwater stage at G-79 (ft, NGVD).......... tailwater stage at G-79 (ft, NGVD) ............ headwater stage at G-81 (ft, NGVD).......... tailwater stage at G-81 (ft, NGVD)............ tailwater stage at S-49 (ft, NGVD) .......... headwater stage at S-49 (ft, NGVD) .......... headwater stage at S-50 (ft, NGVD) .......... headwater stage at S-99 (ft, NGVD) .......... tailwater stage at S-99 (ft. NGVD) .......... M ajor drainage basins in St. Lucic County .................................. ............ 3 Description of major structures in St. Lucie County......................... 3 Rainfall stations in St. Lucie County ...................................... ...... 6 Evaporation stations in St. Lucie County ........................................ 9 Selected rainfall sites for St. Lucie County ......................................-----........ 11 Distances between selected rainfall stations (miles) in SI. Lucie C ounty .................................................... ............................. 16 Regression relationships between selected rainfall stations (mmonthly values) within St. Lucie County ............................................. 16 Flow stations in SI. Lucie County ...................................... ....... 23 Stage monitoring stations in St. Lucie County.............................. 27 Regression relationships between flow stations (daily values) .............. 30 Regression relationships between stages (daily values)............................ 30 Flow data sum mnary ........ ......................................................................... 33 Stage data summary ..................................................... 35 Monthly and annual rainfall (inches) at station BLIJEGOOS_R.............. 56 Monthly and annual rainfall (inches) at station COW CREE_R ..............57 Monthly and annual rainfall (inches) at station FORT PIE_R........ 58 Monthly and annual rainfall (inches) at station SCOTTO G_R............ 60 Monthly and annual areal rainfall (inches) in St. Lucie County ............... 61 Monthly and annual evaporation (inches) at station FT. PI2_E-------................ 67 Monthly and annual evaporation (inches) at station FT. PWER E ............. 68 M ean daily flow at S-49 (cts) ........ ................................. ......................... 73 Mean daily flow at S-50 (cfs)...................................................... 74 Mean daily flow at S-99 (cfs).................................... ............. 75 Monthly and annual average stage at C-23 (ft, NGVD) ........................... 84 Monthly Monthly Monthly Monthly Monthly Monthly Monthly Monthly Monthly Monthly Monthly

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LIST OF FIGURES Figure 1. St. L ucie C ounty location m ap .................................................................... 2 Figure 2. Location of rainfall stations in St. Lucie County ........................................ 5 Figure 3. Rainfall data available for St. Lucie County ..................... 7 Figure 4. Daily historical rainfall data available for St. Lucie County.................. 7 Figure 5. Location of pan evaporation stations in St. Lucie County ................ 8 Figure 6. Daily historical pan evaporation data available for St. Lucie County......... 9 Figure 7. Flow chart for estimating missing daily rainfall values ............................ 13 Figure 8. Selected monitoring sites in St. Lucie County ...................................... 15 Figure 9. Statistics for monthly rainfall at station BLUT :GOOS_R (Period: 01/01/79-12/31/99) ......................... ......... 16 Figure 10. Statistics for monthly rainfall at station COW CREE..R (Period: 01/01/70-12/31/99) ..................................................................... 17 Figure 11. Statistics for monthly rainfall at station FORT PIER (Period: 01/01/14-12/31/98) ...................................................................... 17 Figure 12. Statistics for monthly rainfall at station SCOTTO G_R (Period: 01/01/60-12/31/99) ................................................................... .18 Figure 13. Daily distribution of areal rainfall in St. Lucic County............................. 18 Figure 14. Hunicane Cleo track (08/20-09/05/64) .................................................. 19 Figure 15. Yearly distribution of areal rainfall in St. Lucie County ........................... 19 Figure 16. Statistics for monthly areal rainfall in St. Lucie County (Period: 01/01/14-12/31/99) ...................................................................... 20 Figure 17. Statistics for monthly pan evaporation at station Fl'. P12_E (Period: 01/01/75-12/31/99) .................................... ............................ 20 Figure 18. Statistics for monthly pan evaporation at station FT. PIER E (Period: 01/01/82-12/31/98) ..................................................................... 21 Figure 19. Location of flow stations in St. Lucie County ........................................ 22 Figure 20. Location of stage monitoring stations in St. Lucie County...................... 26 Figure 21. Flow chart for estimating missing daily flow values ............................. 29 Figure 22. Linear and nonlinear stage relationships between S-99T and S-50H ....... 31 Figure 23. Linear and nonlinear flow relationships between S-99 and S-50.............. 32 Figure 24. Monthly statistics for mean daily flow at S-49 (Period: 01/01/62-12/31/99) ...................................................................... 33 Figure 25. Monthly statistics for mean daily flow at S-50 (Period: 01/01/65-12/31/99) ............. ... .................. ................................ 34 Figure 26. Monthly statistics for mean daily flow at S-99 (Period: 03/01/64-12/31/99).................. ........ .................................. 34 Figure 27. Monthly statistics for mean daily stage at C-23 (Period: 02/01/83-12/31/99) ................................................................... 36 Figure 28. Monthly statistics for mean daily stage at C-25 (Period: 01/01/84-12/31/99) ................................................................. 36 Figure 29. Monthly statistics for mean daily headwater stage at G-78 (Period: 01/01/86-04/30/89) .................................. ......................... 37 Figure 30. Monthly statistics for mean daily headwater stage at G-79 (Period: 01/01/87-12/31/98) ............ ............... ........... 37

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Figure 31. Monthly statistics for mean daily tailwater stage at G-79 (Period: 10/01/95-12/31/98) ................................................38 Figure 32. Monthly statistics for mean daily headwater stage at G-81 (Period: 01/01/96-09/30/98) .................................... ................................. 38 Figure 33. Monthly statistics for mean daily tailwater stage at G-81 (Period: 01/01/96-09/30/98) ...................................................................... 39 Figure 34. Monthly statistics for mean daily headwater stage at S-49 (Period: 01/01/62-12/3i/99) ..................................................................... 39 Figure 35. Monthly statistics for mean daily tailwater slage at S-49 (Period: 06/01/94-12/31/99) ................................... ...................... ........ 40 Figure 36. Monthly statistics for mean daily headwater stage at S-50 (Period: 01/01/65-12/31/99)................................................................... 40 Figure 37. Monthly statistics for mean daily headwater stage at S-99 (Period: 03/01/64-12/31/99) ............................... .............. .. .............. 41 Figure 38. Monthly statistics for mean daily tailwater stage at S-99 (Period: 03/01/64-12/31/99) .................... ......... ............................... 41 Figure 39. Schematic view of C-23, C-24 and C-25 basins hydrologic system and annual water budget. ............................................ .................. 43 Figure 40. D)aily rainfall and total outflow from the C-23, C-24 and C-25 basins (Period: 1965-1999) ......................................... ............ 44 Figure 41. Relationship between monthly rainfall and total monthly outflow from C-23, C-24 and C-25 basins (Period: 1965-1999).................... 44 Figure 42. Double mass curve for cumulative annual rainfall and cumulative total annual outflow in C-23, C-24 and C-25 basins (Period: 1965-1999).......45 Figure Al. Daily rainfall at station BLULEGOOS_R ................................................. 51 Figure A2. Annual rainfall at station BLUEGOOS_R ............................................. 51 Figure A3. Daily rainfall at station COWCREE_R .....................................................52 Figure A4. Annual rainfall at station COWCREE_R.................................................. 52 Figure AS. Daily rainfall at station FORT P _IER .................................................... 53 Figure A6. Annual rainfall at station FORT PIER .................................................... 53 Figure A7. Daily rainfall at station SCOTTOG_R................................................ ......54 Figure A8. Annual rainfall at station SCOTTOG_R .................................................. 54 Figure C1. Daily pan evaporation at station FT. PI2.... ........................................64 Figure C2. Annual pan evaporation at station FI. PI2E ....................................... 64 Figure C3. Daily pan evaporation at station FT. PIER_E ........................................... 65 Figure C4. Annual pan evaporation at station FT. PIER---------....................................... 65 Figure F l, M ean daily flow at S-49............................................................................ 70 Figure E2. M ean daily flow at S-50 .......................................................................... 70 Figure E3. Mean daily flow at S-99 ................................................. 71 Figure G I. M ean daily stage at C-23 ..........................................................................77 Figure G2. Mean daily stage at C-25..................................----------...................................---77 Figure G3. Mean daily headwater stage at G-78 .................................... ....................78 Figure G4. Mean daily headwater stage at G-79 ..................................................... 78 Figure G5. M ean daily tai]lwater stage at G-79 ...........................................................79 Figure G6. Mean daily headwater stage at G-81 .........................................................79 Figure G 7. M ean daily tailw ater stage at G -81 ........................................................... 80

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Figure GS. Figure G9. Figure G 10. Figure G11. Figure G 12. M ean daily headw ater stage at S-49 .......................................................... 80 M ean daily tailw ater stage at S-49 .......................................................... 81 Mean daily headwater stage at S-50.................................. ......... 81 Mean daily headwater stage at S-99.................. ................... 82 Mean daily tailwater stage at S-99 .................. .................................... 82

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1. INTRODUCTION St. Lucie County is in the upper east coast planning region of the South Florida Water Management District, at the northeastern corner of the District boundary with the St. Johns River Water Management District (Figure 1). The county lies between the Atlantic Ocean to the east, Okeechobee County to the west, and Martin County to the south. Five major drainage basins are in the county, namely C-23, C-24, C-25, C-59 and the North Fork of the St. Lucie River Basin, covering a total of 453.6 square miles (Table 1). The North Fork of the St. Lucie River Basin (180.7 square miles) covers about 40 percent of the total drainage-basin area. Filty-thre percent (263.5 square miles) of the C-23, C-24 and C-25 drainage basins lie in St. Lucie County. Six major water control structures are in the county, namely S-50 (fixed crest weir), S-99 (gated spillway), S-49 (gated spillway), G-78 (gated culvert), G-79 (culvert) and G-81 (steel sheet pile dam with gated weir). Structures S-48 (fixed crest weir) and S97 (gated spillway) although located on the C-23 canal, which lies in the boundary with Martin County, belong to Martin County. Hydrologic data for these two structures have been summarized in the Hydrologic Report for Martin County (Raymond, 1999) and, therefore, are not presented in this report. However, results from the analysis of the data are used in this report. The coastal structures S-49, S-50 and S-48 (for Martin County) are the most important and are designed to prevent saltwater intrusion to local groundwater by maintaining upstream water surface elevations to specified design levels. Also 5-49, a gated spillway, controls discharge from C-24 to tidewater. The other structures work as dividers between basins and control flood waters from one basin to another. A summary of the structures' informnation is given in Table 2. This report will present a summary of the hydrometeorologic information (rainfall, evaporation, flow and stage) available in the District corporate database DBHYDRO for the St. Lucie County, and a methodology to develop a best set of hydrometeor-ologic information. A good set of information developed and known as the preferred data set will be incorporated into DBHYDRO database. A set of preferred dbkeys has been assigned and are reported. The hydrometeorologic information is presented in tabular and graphical formats to give better understanding to the reader. Daily, monthly and yearly statistics (mean, median, standard deviation, maximum and minimum values) are presented for rainfall, pan evaporation, flow and stage data.

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Struc ASFW '' Lake S, S Fl 0 SFW Drain cture MD canals orida Shore MD Boundary iage Basins w -F II St. Lucie County 20 Miles Location map Figure 1. Si. .Lucie County location map ^ ...

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Table 1. Major drainage basins in St. Lucie County Basin C-24 C-59 North Fork of the St. Lucie River Total (mi ) St. Lucie County (mi) 82.7 41.8 139.0 9.4 180.7 453.6 Martin County (mi2) 0 18.7 10.9 100.6 Okeechobee County (mi2) Indian River County (mi2) 0 0 0 6 166.6 187.9 191.6 878.6 27.6 159.8 0 318.4 Table 2. Description of major structures in St. L.ucie County Specifications Maintains stage greater than 12 ft. in lower reach of C-25 if flow in the canal is adequate, to prevent saltwater intrusion to local groundwater ........... Controls water surface elevations in upper reach of C-25 (19.2 ft. .HW 20.2 ft. during wet season and 21.5 ft. 11W 22.5 ft, during dry season) and discharge to lower reach of C-25. Normally closed and functions as a divide between C-24 and C-25 basins. Can be opened to supply water from C-25 to C-24 basin during dry season, or to pass flood discharges from one basin to the other. Controls water surface elevations in C-24 and discharge from C-24 to tide water. Prevents saltwater intrusion to local groundwater when flow in the canal is adequate. When flow is adequate, 18.5 ft. HW 20.2 ft. during wet season and 19.5 ft. -HW < 21.2 ft. during dry season. Functions as a divide between C-23 and C-24 basins. Normally closed, can be opened to discharge excess water from C-23 to C-24 during a storm event, or to supply water during periods of low flow from C-23 to C-24 basin. Operated as a weir to maintain max. 11W stage of 23 ft. in C-23 South to G78. Flashboards are set at 21 ft. during wet season and at 22 fl., during dry season. Control structures S50 S99 Type Fixed crest weir Gated spillway Steel sheet, pile dam with gated weir Gated spillway Gated culvert Culvert Location (basin) C-25 C-25 C-25 C-24 C-24

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2. CLIMATIC DATA In the following section, the existing climatic data (rainfall, pan evaporation) are presented, as well as a methodology for selecting stations and sites, and for developing the preferred data set.. 2.1 EXISTING DATA 2.1.1 Rainfall Twenty-seven rainfall stations (13 active and 14 non-active) are in St. Lucie County. Figure 2 shows the locations of all the rainfall stations in the county, and Table 3 gives the description of the stations. As it can be noted in Figures 3 and 4, data availability ranges from two to 98 years, and only five stations have 30 or more years of data. The oldest station (98 years) is FORT PE_.R, a National Oceanic and Atmospheric Administration (NOAA) site, with data starting as early as 1901 and a large gap of missing data between 1909 and 1914. 2.1.2 Evaporation Five pan evaporation stations (two active and three non-active) are in St. Lucie County (Figure 5). Table 4 gives a description of the stations with associated dbkeys in DBIIYDRO database. Only the two active sites have data for more than 15 years. As it can be seen in Figure 6, although daily informalion is available for the two active pan evaporation sites, a large amount of missing daily data are observed. The only period where data were available for all the five sites was during the one-year period 1982-1983. 2.1.3 Other Climatic Data An active weather station (SVWX, Savannas Preserve weather station) is in St. Lucie County. Starting in 1997, it provides net and total solar radiation, air temperature, relative humidity and wind speed data. However, these climatic data are not part of this report. 2.2 METHODOLOGY The methodology that will be followed below has been discussed in the hydrologic report for Martin County (Raymond, 1999). It includes station and site selection, and the different methods used for climatic data quality assurance (QA/QC).

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110 ----------------------------100 .-----------90 ----------------704 ----60 -----------3 2 50 40 0r 20 Rainfall station with DBKEY Figure 3. Rainfall data available for SI. L.ucie County 14 12 10 420 7Figure 4. Daily historical rainfall data available for St. Lucic County

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Table 4. Evaporation stations in St. Lucie Counlly SI AIION ALTERNATE ID AGCY RCDR SI HI END STATION DESCRIPTION DBKFY I.,.AT LONG rs' SOUTHERN_E EVP314 WMD APAN 1961 1984 SOUTHERN FRUIT DIST 06339 271300 803052 4 SWAIN GR E EVP347 IWMD IAPAN 1982 19B3 SWAIN GROVE 106342 272110 802852 2 F .PIEH EVP37 WMD APAN 1982 2000 FT. PIERCE FIEI.D STATION 06347 272202 803052 18 FT.I ..2 E EVP15 WMD APAN 1969 2000 FT. PIFRCE 06356 272616 802059 31 MAYFLO13_E EVP306 WMD APAN 1981 1985 MAYFLOWER COHP. 06388 272701 803359 5 : YPars (roilnded) of data available Dain Figure 6. Daily historical pan evaporation data available for St. Lucie County 2.2.1 Station and Site Selection The selection was based on the following procedure: a. Stations were grouped based on their proximity to each other. b. Stations with long periods of record were considered within each group. c. All stations with less than 10 years of data or with more than 10 percent of missing data were disregarded inside the groups, but were used for filling gaps in selected stations. I) ......... ,-.-, ....

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Sixteen rainfall groups (Table 5) were deteimined using this procedlure, and four rainfall sites were selected to better represent the rainfall distribution in the county: BLUE GOOSE, COW CREEK, FT PIERCE TOWER and SCOTTO GROVES. For pan evaporation data, only two sites, namely FT PIERCE and FT PIERCE FIELD STATION, were selected based on the same procedure. 2.2.2 QA/QC Cumulative daily rainfall values The cumulative daily rainfall values (tagged as A, for cumulated, preceded by X, for unknown value, in DBHYDRO) are common cases in the database for manual recorders. It happens when daily values are cumulated during weekend or holidays, and then recorded on Monday or the next business day. The procedure is the following: a. Horizontal distances between rainfall stations were used (under the assumption that there is not much concern about the station elevation; which is indeed the case in the south Florida area where the topography is flat). b. Cumulative daily rainfall values were distributed in proportion to that of the nearest station, which involves an iterative process whenever the nearest station also has a cumulative value. Whenever the cumulative daily rainfall values could not be distributed over the period (no data available for nearby stations), and the gap fell between two consecutive months, the specific months were not included in statistical analyses for both monthly and yearly estimates. Missing daily rainfall values Daily rainfall estimation also involves a two-step procedure where horizontal distances are used to assign the rainfall value r-om the nearest station with a value (zero or non-zero) to the missing daily-value station. If the nearest station has a missing value, one proceeds with the value for the next nearest station. An M tag was reassigned to the missing daily rainfall value if there was no close station with data for the day.' Monthly rainfall values The procedure involved is the following: a. Regression relationships for monthly total rainfall values between pairs of' stations were established.

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G C F 9 O O U G O p 'S G O "n G G O D .Cu N uu G 4l G G ri O O N = G G' O G G .^. C v G C J O O rl N G W O G O O F rr] F F F F [:/; ril F F :r] f. F F Fva. -.r r rn O u 7 7 O a: N zT O m AD o rrp a m O r"I C I W r) P T r CJ -rJ o1 r^I CJ Ki a u cJ Y Y rrJ CJ nl K rr_ :ic cJ CI tt-.' -rJ Ki nl CJ Ki Ki r., W rl vl n r : K r v; fY v', v; i G 1 ? -vl O -P n r. -. vI a w n I'-h a o o C r [' rn W G P ? W r. K. N J fM1J CJ r"I I N l nl I cn r fJ fl N rl C"J fn rJ rl ry Q P P'v G P o G o .. o o G o P P G P P G P P P 0 4 FJ W W W 'J.^ W W W 'lC W W W 'S W W W W W W W W 'Y] W W W W W %] ^ + r"1 Cl rJ In r-C W x W -+ H r-Z fJ 1-rD t' 7 7 O C --^T N ^!t In -N r":I C n ~ O r"1 N N of K', --vJ Ln In In r-r W rl rJ rv N N N N K K t-. !+ '+ a Q; r r r rr-rrr-rt l1 r 1 I r rl c r CAI CA 1 Ir I CA! rd N N hl rl rJ rl of N o"1 N r"1 NIrN rJ N r"1 N r"1 N N N rv N hl N is N fJ hl f"1 -r f-M O n of q ^S ^ n fJ 'P l ry P 11 a w f. n CA '* GAT n iOO" CJ K: 1 .Kppi in [D rO r In InR v w r4 In G G P G G .a c a o C o o .u 'y. C F d d d Q U r; n J J J F I''I r'"I N c4 x 00 V j ypD OOL-I,--10000 3 -d; W W rA ~~'dddd UU q >444 x [? UUrn rii G a a77 ga0000rn F 7y71gggqcncn qua COC z x70 ra. ya a y cC r V +~v: dddwd0.;rx Fr:.OP rwjC7(_y0. 'dQ q'7vuirWn Sv l..5C0vW 'c.'W W W wxx0C UxS a00 .d.) ? ;: IXx W wV V V U 0 O05. a:0..4CrxiVL vc4xx DO OaF, c .w v7 vl v; W --' a H GJ =7 c o.wo. ddaa?'a a, r K v, o o rte, C C o. W K: .n a P W a o w o w o uc n Ell -nl rv rv CJ --CJ N -N r"I -a N --y rJ -+ N rJ N x W x G O l CA wl O m U G P m O w S C [w O Q a C a -a, a a a a Oa T O a a w rr L4 O C, W .P. w 1-4 f? f G w q _O U-r M1 a Fr;. o .-1 z U r. G P. W 7. j lx: .llR: W d p. d x f--1 c.r. ?.' c". C] O F U P 5 0." W V U FC V U U U .p ^' U ^.: O f-U v z z z z4 4 z a z z z z z z z 04 r" 6 3 3 3 5 G 3 5 3 5$ 3 3 G 5 G z x x xi cQ UPI I aaxlx xlaa ry o >u1 OO..wc.. aF.00pr FOac" s Cq W s u] : 0. r/i rn U U J. U. v 1 cry l1l:. G v rr U 7 O N rN f n rU G CJ M vl r ob G1

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b. Monthly rainfall totals (derived from the sum of daily rainfall totals) were checked against the estimated total monthly rainfall derived from regression equations. If they differ significantly, then an adjustment to the estimated daily values is necessary. The three procedures described above for cumulative daily rainfall values, daily rainfall values and monthly rainfall values, will be used jointly and iteratively when doing QA/QC. Regression relationships for pairs of stations located nearby (group of stations) were completed. Pairs of monthly data points with missing values were disregarded. The estimated monthly values from the regression relationship were used jointly with the procedures discussed above for estimating missing daily values. The full procedure discussed above is shown in the flow chart on Figure 7. Pan evaporation data The procedure involved is to: a. Limit maximum daily pan evaporation values, based on location, month, maximum extra-terrestrial radiation (water equivalent values are 0.36, 0.43, 0.52, 0.59, 0.62, 0.64, 0.63, 0.60, 0.54, 0.46, 0.38, 0.34 inches/day for January to December), and on the fact that approximately 58 percent of the solar radiation is not reflected into universal space (Gray, D., 1970). Therefore, an estimated daily maximum pan evaporation was 0.37 inches. b. Estimate daily missing records using linear interpolation. 2.2.3 Estimating Areal Rainfall The objective for estimating areal rainfall is to provide a data summary for the historical rainfall average over the study area. This average can be computed in two ways: (i) from a weighted average using the Thiessen polygon method, whenever the digital boundary for the area is available, or (ii) simply from an arithmetic average of the data. Since there are years for given stations without data, the Thiessen polygon method requires a different weight for each subsequent layout of the rainfall stations, and, therefore, was not used, being cumbersome. The arithmetic average was used in this report.

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INPUT COM'UTE Monthly rainfall values (risregard mo(nth with mirssing vlues) CO 'UTE Horizonl l distances between stations Group nearby rainfall stations PERFORM Mo hly regression analysis with pair of nearby station EST IMAJ_ Missing daily values using best estimated monthly value r*: logic path B : decision : action Figure 7. Flow chart for estimating missing daily rainfall values

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2.3 SUMMARY OF CLIMATIC DATA 2.3.1 Rainfall For the selected monitoring sites in Figure 8, horizontal distances are given in Table 6. Regression relationships between pairs of rainfall stations are given in Table 7. Appendix A gives a summary of the daily and annual historical rainfall data for the four selected stations BLUE.GOOS_R, COW CREE_R, FORT PIE_R and SCOTTOG_R. Annual mean rainfall varies from 46.26 inches in COW CREE_R to 58.67 inches in SCOTTOCG_R. Monthly and annual rainfall statistics (mean, maximum, minimum, median and standard deviation) are presented on tabular format in Appendix B and graphically in Figures 9, 10, 11 and 12. The monthly means at the selected rainfall sites are 4.26 inches (BLUEGOOS_R), 3.86 inches (COW CREE R), 4.43 inches (FORT PIE_R) and 4.89 inches (SCOTTOG_R). Computed daily distribution of areal rainfall is given in Figure 13. The maximum of 7.37 inches was reached during Hunicane Cleo (08/27/64), which was among the worst hurricanes in the southeast coastal area of Florida. Cleo (Figure 14) moved up the east coast of peninsular Florida, about 20 miles inland, paralleling the east coast, and damaging citrus groves in the Indian River area and vegetable fields in the Pompano Beach and Ft. Pierce areas (Attaway, 1999). Hunrricane Cleo caused heavy damage to vegetable crops along the lower cast coast, particularly vine-ripe tomatoes in the Pompano Beach area, mature green tomatoes in the Ft. Pierce area and early pepper plantings in the Pompano Beach-Martin County area. Monthly and annual distribution of areal rainfall is given in Appendix B and Figure 15, while the monthly statistics are presented in Figure 16. For the 86-year period, the mean annual areal rainfall for St. Lucie County is 52.74 inches, and the monthly mean is 4.39 inches. The wet season, as depicted in Figure 16, goes from June to October, accounting for 61 percent (32.38 inches) of the total rainfall (52.74 inches). September is the wettest month with a mean monthly of 7.68 inches. The driest year was 1917 with 32.05 inches, while the wettest year was 1947 with 77.76 inches. 2.3.2 Evaporation historical daily and monthly evaporation data are summarized in Appendix C for the two sites FT. P12 E and F'. PIER _E. The monthly and annual statistics are presented in tabular form in Appendix D and in graphical format in Figures 17 and 18. Mean annual pan evaporation varies from 61.2 to 63.89 inches, while mean monthly evaporation is 5.1 and 5.32 inches for the two sites FT. P12_.E and FT. PIER_E respectively. For both sites, more than 70 percenl of the evaporation occurs during March to September.

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J a 1lantic ¢ m Y V u r CN 4 rye N. ..w S^f wn Y 1 GA gI i wg~pY / YI 11 N I'M y n+ w 9fNw aw n. m r Y 1 i ~; ? w h SXj a X11 2 M }, ,w"" vmr = '{ QW w 'w" 'S. + w Jay tul, f M W ih h4 Mr^ T.M "" M1u du Wu Q w ryv a 6 y'm W 'ifa"'" W L O a] w tJ] M b N V v r

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Table 6. Distances between selected rainfall stations (miles) in St. .ucie County FORT PIEi COW CREE BLUTE GOOSE SCOTTO FORT PIE COW CREE RLT GOOSE Table 7. Regression relationships between selected rainfall stations (monthly values) within St. Lucie County Site X Site Y FT. PIER BLUE GOOSE FT. PIER COW CREE STUART FORT PIE, FORT PIE SCOTTO Equation Y = 0.82 X + 0.54 Y = 0.77 X+ 0.53 Y = 0.85 X+ 0.18 Y=0.91 X+0.87 BUGOOSE Jan Feb Mar Apr May Jun Jul Aug Sep Ocl Nov Dec I Miui'um U Medlan a Mean Sr;and. Dev 0 yl,ximi,. Statistics for monthly rainfall at station BLUEFGOOS_R (Period: 01/01/79SC OTTO 8 1r2 0.68 0.72 0.87 0.52 Figure 9. 12/31/99) 8

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25.00 .. --COW CREEK Jan Feb Mar Api May Jun Jul Aug Sep Ot Nov Dec Morfh lMl! imor2 SOMAxlmlly Figure 10. Statis.ics for monthly rainfall at station COW CREE R (Period: 01/01/7012/31/99) Jan Feb Mar Apr May Jun Jul Aug Sep Ocl Nov Dec DMililu'l UMediau' MMILuI El .Sra'nd. Dev OMaxiL n Statistics for monthly rainfall at station FORT PIE R (Period: 01/01/14Figure 11. 12/31/98)

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Iscd1'folcRoves I 25 00 1---... HMonthly mean: 4.89 iin 19.50 .. .. ...... 10.B0 880. 15.75 1 Jan Feb Mar Apr May Jun Month 10.07 1 I Jul Aug Sep Oct Nov Dec 7Minim I WMedian 1Mern BStnrd. Dev Marlmum Figure 12. Statistics for monthly rainfall at station SCOTTO G_R (Period: 01/01/6012/31/99) Date Figure 13. Daily distribution of area] rainfall in St. T.ucie Counly 20.00 10o00 no~---I I ----F] tH lm--~----------Il~o--m ) .......... IOBO ffl -... 9U I H I

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Figure 14. Hunicane Clco track (08/20-09/05/64) Year Figure 15. Yearly distribution of arcal rainfall in St. ..ucic County 19

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-1931--18.61 rn Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec t fMr Ul d.ODv I MiliniLal il Mediau DMaxiul Figure 16. Statistics for monthly 12/31/99) areal rainfall in St. Lucie County (Period: 01/01/14 Jan Feb Mar Apr May Jun Jul Auy Sep Out Ny Decr Mollth SIMeanl Stanrli lev I Mlirnull l M dilanr DManirur,. Figure 17. Statistics for monthly pan evaporation at station FT. P12_E (Period: 01/01/7512/31/99) 25.00 AREAL 20.00

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1000 FORT PIERCE FIELD STATION Jan Feb Mar Apr May Jun Jul Aug Sep OCt Nov Dec Mnnlh I IMean IStand. Dev I Minimum Bledian l Maximum Figure 18. Statistics for monthly pan evaporation al. 01/01/82-12/31/98) station FT. PIER_E (Period: 3. SURFACE WATER DATA In the following section, the existing flow and stage data are presented as well as a summary of structure operation and specification. A methodology for site selection is also discussed and a summary of information is presented. 3.1 EXISTING DATA 3.1.1 Flow Fifteen flow stations (five active and 10 non-active) are located in eight flow monitoring sites in St. Lucie County (Figure 19). Data availability vanes from two to 32 years and is summarized in Table 8. Each structure's operation is based on stage elevation data. Therefore, the QA/QC process involves some basic knowledge of structure operation and specification, as discussed below. I .oo -----

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z a 76 C -E C C Q m U 0 p m m m -r,. QI.U '7 U mtogv. cnpp fn v p A C O U c U 7 V] d O w O C O U O a 41 7 t4 [z,

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N "J Q n W N r9 N M1 N O N V V Cn Cn W [tl v M Tannv)nnM1M1 W W WmQ N N N N r r 0 0 N W Q Q ] "J ] 5 N N N N N N N N r U Q O Q O Q O Q C d C7 b 0 O J W W W co W w co OJ W W CO m Co of Co N N N N N N M1 n V ] '^ r V 0 0 r N N O N D (C 47 In In Co W W co W W tf1 N N N N N N N N N N N N hnnnnnnnM1M1M1r-nr M1r¢ N N N N N N N N N N N N N N N .m cnvnn.-oin co cci t o n w n D W Wnvm m v nM1N N L+7 n 4'] W n M1 M1 Ln m M1 r+ W N in to O LL r' Q r r O r 0 0 0 00 S O O U~ 0z ooh W aaa ¢¢¢d Www hwwwh2z zzz¢¢zzz¢(Da V V V C rn N In N J W N N N N N N N¢ Z Z rn UUUUUUU bzOo W QQQQQQQQUZz ZD zzzzzzzzwww O 7 C¢J U U U U U U U O W W LL cr z z z z z z z Z z W W ¢ 0 0 0 0 0 0 0 0¢ WD DW u'W co W}arrir>rzz W(9 cOrn (C rte O N rOD LO N (a 1n (Nn N ED Lf" N d } FF z O J ¢ ¢ a z O UUU UU7 t1)rl) co U Ui(n U)Z ¢ 0 Ol mlm rn u), Q o ) 0) M7? O 0 .C7 U C7l) ) U7 c) c nn w (n 0 Car) 7 7

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Structure S-50: a Operation of this coastal structure is uncontrolled. a Since weir crest elevation is 12 feet, discharge begins only when the upstream water surface elevation exceeds 12 feet. a Control of the drainage basin is affected by S-99 located about 8 miles upstream. Structure S-99: a During low range conditions, when the headwater falls to 19.2 feet, the gates begin to close. The gates remain closed when the headwater elevation rises or falls to elevation 19.7 feet. The gates begin to open when the headwater elevation rises to 20.2 feet. o During high range conditions, the gates begin to close when the headwater elevation falls to 21.5 feet. The gates remain closed when headwater elevation rises or falls to 22.0 feet. The gates begin to open when the headwater elevation rises to 22.5 feet. Structure S-49: Q During the flood season and under normal conditions, the gates begin to open when the headwater rises to 20.2 feet, remain closed when the headwater rises or falls to elevation 19.0 feet, and begin to close when the headwater elevation falls to 18.5 feet. o During the dry season and under normal conditions, the gates begin to open when the headwater rises to 21.2 feet, remain open when the headwater rises or falls to elevation 20.0 feet, and begin to close when the headwater elevation falls to 19.5 feet. Structure G-81 (Orange Avenue Control Structure): L Allows uncontrolled flow from C-24 to C-25 basin (and vice versa) when stage on either side of the structure exceeds the crest elevation of 23.0 feet. o During the dry season the structure is opened when the stage at S-49 (C-24 basin) is below optimum and when it is considerably lower than the stage measured at S-99 (C-25 basin). Q During the flood season the structure is opened when flood conditions exist in one basin and additional flows will not create a flood condition in the other basin.

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Structure G-79 (Carlton Road Control Structure): a The structure acts as a drainage structure for C-23 between G-78 and G-79, and it permits flow to be transferred from C-23 to C-24 as required. Q Control is effected by flashboards mounted on a riser pipe on the west end of the culverts. G-78 (C-23 Plui Structure): Q The structure acts as a drainage divide structure of C-23 between the north and souLth sides of the structure. u Control is effected by flashboards mounted on a riser pipe at the south end of the culvert (top elevation is 23.2 feet). o The structure is normally closed but it allows transfer of water from C23 to C-24 when the western porltion of the C-23 basin is well in excess of optimum and the C-24 basin has capacity to spare. 3.1.2 Stage There are 56 stage monitoring stations in St. Lucie County at 20 sites. Only nine sites are active and located at the major structures and in C-23 and C25 canals. Figure 20 gives a layout of stage location in St..Lucie County. Table 9 gives a summary of all the stage monitoring stations with descriptions and ycars of data available. 3.2 METIIODOLOGY The methodology includes the selection of station and sites, a QA/QC process involving graphical examination, establishing relationships between flow sites, and filling gaps of missing data. 3.2.1 Station and Site Selection Only three flow sites were selected, namely S-50, S-99 and S-49. The selection was based on the importance of the structure and the availability of information on the station. For stage data. more information was available, therefore more sites were selected. The stage sites include C-23, C-25, G-78, G79, G-81, S-49, S50 and S-99.

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T fp C C N mU om d CO a ALL LL n mda + 33 7 O U CL) Cd U 7 a V] G F. O y W C Ci N nn b w 0 0 U O O r N Tj 51]

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Table 9. Stage monlitoing stal.ions in St. J.ucie County S AI llON U23 U23 G25 C2 C25 G79 H C37 T 7,7__h G3/9 T GB1 H G81 H 381 T G81 T GORDY H IR.BOATL IR.BOATL IR.BOATL IR.MCCAR IR MCCAR IN MCCAR IR OST Fr. IR OSTEE R. OSTEE S49 H 349 H 349 H 349 T S49 T 350 H 350 H 39_H 899 T 399 T 399.. T SAV1 SAVAN H L.R BR!T 1LR.DRIT SLR. EBRIT )LH.KELL SLH.KbLL 3LR.KELL 3LR.SAND SLH.SAND, Sn SAND SWAINAH SWAINAB /AIN _H 'AIN._T /ADOU_H /AOU ALTERNATE C23'FEC C23FEC C25'RADE C25RAD I C:hRADG78 @H G79+H G79-H 379@R G79+T. 081 .H G 1 -H 81 iT 0G81-T GORDYI H GORDYi T BOATLAND BOATLAND BOATLAND MCCARTNE MCCARTNE MCCARTNE OSTEENS OSTE. LNS OSTEENS S49"H 549 H S49-H S49,T S49-T 55U'H 350-i-H 998'11 399+H 899,H 399" m S99-T SAV1, 22/1561i BRITT BRITT BRITT (ELLST (ELLST (ELLST BANDPIPE SANDPIPE 3ANDPIPE ;WAIN'A SWAIN'/AIN+H 'AIN+T 'AOUL-H ,ArOU-LT AGCY WMD WMD WMD WMD WMD WMD WMD WMD WMD WMD WMD WMD WMD WMD WMD WMD WMD WMD WMD WMDr WMD WMD WMD WMD WVMD W/MD WMD WMD W MD WMD WMD WMD NMD VMD WMD NMD WMD WMD WMD WMD WMD WMD WMD WML WMD WMD WMD WMD WMD WMD WM[) WMD "" Years (louldOc) of data available CODH CRH10 CH10 TELE STAF CR1I) TE F STAF CR10 TELE CR10 TELE CR10 TELE O:R10 CR10 SDIG SDIG SDIG SDIG SDIGC DIG SP01 TELE 8013 TELE A35 CR10 SPU1 TELE ?77? SPOl TELE :R10 3DIG SDIG SDIG SDIG SDIG SDIG SIDIG SDIG 77 ,R10 OR10 R10| '--STAT 0198 1999 1997 199 ,98 1 995 1997 1998 1991 1997 1997 1996 1997 199 199 1985 1985 1985 1985 1985 1988 185 1985 1961 1994 1993 1994 1964 1995 1964 1987 1994 1984 1987 1994 1997 1976 1981 10981 1981 1982 1982 1982 1981 1981 1991 1993 1993 1993 1 883 STATION DESCRIPTION CANAL C-23 AT F.E.C. RAILROAD CANAL C-23 AT F.EC. RAILROAD CANAL C-25 EXTENSION BELOW RADE CANAL C-2t EXTENSION BE!.OW RADE END 199 200" 199" 1998 199! 200 1996 S1993 | 1991. 21 140( 200(3 200( 1991 1991 1989 1986 1981 1989 188: 1994 199200" 1994 1994 2000 1995 1994 2000 2000 197/ 1982 1 982 1982 1982 1982 1982 1982 1982 1982 19H5 1985 1996 1996 1990 DBKEY 0458(lWb/I IrH?:i HJ724 CANAL C25 EXTENSION BELOW HADE STATION IN C-23W AT G-79 STATION IN C-23W AT G-79 STATION IN C-23W AT G-79 STATION IN C-24E AT G-79 SIA ION IN C 241.AI G79 STATION ON 024 AT G 81 STATION ON 0-24 AT G-81l STATION ON C-25 AT G1 STATION ON C-25 AT G-Hl CORDY RD. BRIDGE N ST. LUCIE WA GORDY RD. BRIDGE N ST. LUCIE WA ST. LUCIE RIVER AT BOATLAND ST. LUCIE RIVER AT BOATLAND ST. LUCIE RIVER AT BOATLAND ST. LUCIE RIVER AT MCCARTNEY'S ST. LUCIE RIVER AT MCCARTNEY'S ST. LUCIE RIVER AT MCCARTNEY'S 9T. LUCIE RIVER AT OS'TEEN'S DOG 31I LICIE HIVLi4 A' OS; 1 'iN'S )OC T. I..UCIE RIVER AT OSTEFN'S DOC 3-49 SPILLWAY ON CANA. C-24 NFA 3-49 SPTI .WAY ON CANAl. C-24 NEA S3-4 SPIL.LWAY ON CANAL C-24 NEA 3-49 SPILLWAY ON CANAl. C-24 NEA 3-49 SPI-LLWAY ON CANAl., C-4 NEA 3 50 SPILLWAY ON CANAL 025 AT S350 SPILLWAY ON CANAL C-25 AI S-09 SPILLWAY ON CANAL 0-25 NEA 3-99 SPILLWAY ON CANAL C-25 NEA 3-99 SPILLWAY ON CANAL C-25 NEA 98 SPILLWAY ON CANAL 0-25 NEA .98 SPI I. WAY ON CANAl. C-25 NIEA 3-99 SPILLWAY ON CANAL C-25 NEA SAVANNAS PRESERVE. SITE 1 SAVANNAHS DRAINAGE CANAL AT FOR BRITT CREEK NEAR N. FORK ST. LU BRITT CREEK NEAR N. FORK ST. LU BRITT CREEK NEAR N. FORK ST. LU N. FORK ST. LUCIE RIVER AT KELL N. FORK ST. LUCIE RIVER AT KELL J. FORK ST. LUCIE RIVER AT KELL N. FORK ST. LUCIE RIVER AT SAND N. FORK ST. LUCIE RIVER AT SAND N. FORK ST. LUCIE RIVER AT SAND )UTFL.OW CULVERT ON SWAIN GROVES )UTHII.OW CUIl VIN P ON SWAIN GHOVi vES 'IRGINIA AVENUE RETENTION POND 'IRGINIA AVENUE RETENTION POND DU,31 'IRGINIA AVENUE RETENTION POND DU528 VIRGINIA AVENUE RETENTION POND DU532 _ONG 13804 1 0500 FB741 13047 16501 I5749 16565 FB750 15566 F8751 ,JW237 JW238 07057 07058 07059 07063 07064 07065 07060 07061 0147H3 (7953 15775 197401 15775 04384 16534 04852 07703 15781 04854 07745 1782 FI282 0027/8 07013 07014 07007 07008 07009 0701C0 07011 07080 05332 DUH30 27300 27174' 272013 272111 272011 272011 27201! 272652 272651 272651 272651 27241C 27213 272721 27272 27272941 27241: 272413 272541 272558 272558 271542 271542 271542 271542 271542 272807 272807 272814 272814 272814 272814 172014 272814 271861 271355 2713bs 271355 271618 271618 271818 271488 271438 271438 272201 '72201 272521 272529 272529 80345 80344 00324 001)324 811324 80324. 80324( 80324( 80324( 80324( 802351 80235! 00192! 801 92! 801892 80182( .1ll .2( 80182( 80190' 801902 802132 802132 802132 802132 802132 802017 802017 802817 802818 802818 802818 802818 802818 001625 8001826 801711 801711 80)1711 8019 11 801918 801918 801148 8018489 801848 802859 802860 10191 001910 8101904 801904 I AOI I AOU' i. 37 F 7 32 6 '11 9 7 14 32 4 2 2 2 2 2 1 4. LAT

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3.2.2 QA/QC A preliminary examination of the time series was completed through graphical plots. Gaps, overlaps and relationships were depicted. The missing daily data from the selected long time series were filled using the following procedures, as presented in the flow chart in Figure 21: a. Missing daily data in the selected long time series data were filled with daily data from other dbkeys at the site. Most of the time, the difference was in the type of recorders. b. Estimates of daily data were also made from linear regression relationships after downstream and upstream flow-site relationships have been established. Summaries of regression relationships for flow sites and stages are given in Tables 10 and 11. Two sets of relationships (linear and nonlinear) have been developed between S-50 and S-99 (flow and stage data). As depicted in Figure 22, the nonlinear stage relationship between the tailwater at S-99 and the headwater at S-50 better fits the data with a coefficient of determination of 0.99. Major differences between the two models are observed for stage elevation higher than 13 feet. For the flow relationship in Figure 23, although the coefficient of determination did not change very much from the linear to the nonlinear relationship, for flow greater than 2,000 cubic feet per second (cfs) the nonlinear relationship fits better. c. When the missing gap is short (less than three days), linear interpolation was used. d. For all other missing daily data not within these three cases, an M tag was reassigned to the data. 3.3 SUMMARY OF SURFACE WATER DATA 3.3.1 Flow Ilistorical daily flows are presented in Appendix E for S-49, S-50 and S99, while monthly and annual flow statistics are in Appendix F. Table 12 gives a summary of the computed mean, maximum and minimum mean daily flows. Monthly statistics for the mean daily flow values are also presented in Figures 2426.

PAGE 39

S: logic path : decision : action INPUT Daily ilow values PERFORM For gaps, overlaps, relationships EXI" I N v illet NO ESTIMATE Missing daily values using site data set available ESTIMATE Missing daily values U.sing lincear regression relationship ESTIMATE Missing daily values I sing linear interpolation Figure 21. Flow chart for estimating missing daily flow values

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Table 10. Regression relationships between flow stations (daily values) Site (Y) Site (X) S-50 S-50 Relationship Y = 0.9824X + 10.048 Y=aX +bX +cX2+dX+e a=5E-11 (0) b = ,4E-07 (0) c = 0.0007 (0) d = 0.6205 e = 26.888 Table 11. Regression relationships between stages (daily values) Site (X) G-79T G-79T S-99H S-991H S-5011 S-5011 S-99T S-99T C-25 S-97H G-791H .V.r S-99 S-99 0.88 0.89 Y = 1.0767X -1.3405 Relationship Y = 0.9854X + 0.0057 Y = 1.0163X0.4807 Y = 0.9322X + 1.0683 Y = 0.9842X + 0.2235 Y = 1.1827X -2.1953 Y = aX + bX + cX + d a = 0.0293 b = -0.9752 c = 11.778 d = -39.516 Y = 0.8251X+ 2.1094 y --TdRr --r-7 Tx 7a.................... Y=aX +bX +cX+d a = 0.0006 (0) b = -0.0961 c = 2.9951 d= -11.17 Y = 0.9888X -0.0271 Y = 0.9889X + 0.5852 Site (Y) G-8IT S-49H G-81H C-25 S-99T S-99T S-5011 S-50H G-81H C-23 r2 0.99 0.97 0,97 0.94 0.98 0.99 0.98 0.99 0.99 0.98 G-78H

PAGE 41

11 12 13 14 15 16 850 ([) 11 12 13 14 15 16 17 18 10 relationships between S-99T and S-50H Figure 22. Linear and nonlinear stage

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Iy 4 -1E-2E-07x I 0.0'3x.* 0.7775(x 1E if = 0.582 500 1000 1500 20W0 2500 3000 S50 (cS) (b) Figure 23. Lincar and nonlinear flow relationships between S-99 and S-50 1 3 1

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Table 12. Flow Mean daily Maximnu mean daily (cfs) 1204 Minimum mean daily (cfs) Jan Feb Mal Apr May Jun Jul Aug Sep Oct Nov Dec Month -*--Mean Minimum "-'-Medn -Maximum L .. ... -----Stand Dc, Figure 24. Monthly statistics for mean claily flow at S-49 (Period: 01/01/62-1.2/31/99) Site S-49 S-50 S-99 data summary

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Month SMn -Minimum -Median Maximum -----Stand.Dev Figure 25. Monthly statistics for mean daily flow at S-50 (Period: 01/01/65-12/31/99) 7---Jun Jul Aug Sep Oct Nov Dec Muinthl -6-Median --Maxiinurnl ..-.. -I --Dd.Dev Figure 26. Monthly statistics for mean daily flow at S-99 (Period: 03/01/64-12/31/99) 200 Jan Feb Mar Apr May L-Me an Minirnu 'I : _____~ ~ ~ ~ -~-~~~-~~----

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3.3.2 Stage Historical daily stage data are summarized in Appendix G for C-23, C-25, 0-78, G-79, G-81. S-49, S-50 and S-99, while monthly and annual statistics are summarized in Appendix H. Table 13 gives a summary of the mean, maximum and miirnimum monthly stage elevalion as tabulated in Appendix H. Figures 27-38 give graphical presentation of the mean stage data statistics. The following are a few comments related to the stage data and structures operation: 7 The headwater at S-50, with a mean elevation of 12.36 feel, has been kept above the weir crest elevation of 12 feet to avoid saltwater intrusion to local groundwater wells. However, during the end of the dry season (April and May) saltwater intrusion may be an issue with lower water levels. Q S-99, with a mean headwater of 19.98 feet, has been operated in the low range condition. u S-49, with a mean headwater elevation of 19.32 feet, has been operated during flood season and normal condition. Table 13. Stage data summary Mean monthly (ft) 21.38 19.83 21.58 20.91 19.58 19.38 19.26 0.77 12.36 Maximum monthly mean (ft) 23.02 22.10 23.09 22.57 20.57 21.54 20.20 1.98 21.19 13.85 22.26 12.43 Minimum monthly mean (It) 15.04 14.35 18.83 17.30 16.69 15.97 17.46 0.06 14.20 11.26 14.35 Site C-23 C-25 G-78H G-79HI G-79T G-81H G-81T S-49T S-49H S-50H S-99H S-99T 14.58

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dan Feb Mar Apr May Jln Jul Aug Sep Oi Nov Dec Mont -Mean Minimum MedII Figure 27. Monthly statistics for mean daily st an -M ximum .-M Sland Dev age at C-23 (Period: 02/01/83 -12/31/99) 2.50 2.00 1.50 -E 100 w 0.50 0.00 Jan Feb Mar Apr May Jun Jul A,Snp Dt Nov Month Fiure 28Monthlystatisticsformean M my stae at C-Mia5 (PerMxim od: 01/01/84 Figure 28. Monthly statistics for mean daily stage at C-25 (Period: 01/01/84 12/31/99) .......................

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Jan Feb Mar Apr May Jun Jul Au Sep Oct Nov Dec Melhn M'-Mrrc "--Minimum M.xlmum ... Slarnd.Drv J Figure 29. Monthly statistics for mean daily headwater stage at G-78 (Period: 01/01/86 04/30/89) 2100 22.00 Jan Fo Mar Apr May Jnr Jul A'l.g Sep Nov Dcu; ~"Mean --Minirrurri -Meian ----MaxinmurT -... San ._ev Figure 30. Monthly statistics for mean daily headwater stage at G-79 (Period: 01/01/87 12/31/98) 141.11 2100n .100 --------

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[OT Jan Ieo Mar ADp May 1 Meen U Minimr um Monthly statistics for mean Jun Jul Aug Sep Oct Nov Dec Month d tMedin a Maximum -Std.Dev daily tailwater stage at G-79 (Period: 10/01/9521.00 20.00 Ca V 19.00 S1 B.00 1 ].00 15.00O P5r Jean Feb M;lr Apr May Jun Jul AUg Sep Oct Nov Dec Month MeSan + Minri -iluAl -Mu dir l M-,luxirrLr l;,rld D;i 1 Figure 32. Monthly statistics for mean daily headwater stage at G-81 (Peuiod: 01/0119609/30/98) Figure 31. 12/31/98) :: J

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Jun Fhb Mar Apr May Junl Jul Aug Sep Ocl Nov Der Mount --t Men -Minimlm -Milarn *Maximm ------StandDev Monthly statistics for mean daily tailwater stage at G-81 (Period: 01/01/96IJn Feb Mal Apr May lJul .Jul Aug Sep Ocl Nclv D --Mn Mlnimum -Median MsxImLm n ---Stand.Dev Monthly statistics for mean daily headwater stage at S-49 (Period: 01/01/62Figure 33. 09/30/98) 20.00 21.00 1&o 0 17.00 z S15.00 12.00 1101)9.00 Figure 34. 12/3 1/99) ~~~~~--~~~---

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IJan Fcb Mar Apr May Jun Jul Aug Sep OCt Nov Dec -*-Mean --MnlmumA-Medlan --Ma mum ---S: .tand.Dev Figure 35. Monthly statistics for mean daily tailwater stage at. S-49 (Period: 06/01/9412/31/99) 10.00 9 00 Q00j Jan Feb Mar Apr May Jun Jul Aug sep Oct Month -Mrn -Minimum -Median -Maximum ----Stand Dev Figure 36. Monthly statistics for mean daily headwater stage at S-50 (Period: 01/01/6512/31/99) Snin Nov Dec : I---~ +---+a on-----......--. -. .0

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Jan Feb Mur Apr M;ay Jun Jui Aug Sep Oct Mirlth -M nn irrn -^-Mm etm ia n Maximum -----StardDev Figure 37. Monthly statistics for mean daily headwater stage at S-99 (Period: 03/01/6412/31/99) 9 00 Jan Feb Mar Apr May Jun Mean --Minimumil Jul Aug Sep Oct Nov Dec --Median -*. -Maxirurnii -Stand.Dev Figure 38. Monthly statistics for mean daily tailwater stage at S-99 (Period: 03/01/6412/31/99) S00 U 0.40 Nr Dec 10.00 -----~ --. Lnrli ~c--~-----240 .gr --...... .-...-----.... .... ....-...-....-... ..-------... .. ... .... ..--...

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No flow has been allowed at (-81 since stages on either side never exceeded the weir crest elevation of 23 feet. This might explain the reason why this station has been retired in the database after almost three years of moniLoring. o Although the maximum elevation of 23.2 feet (top elevation) has been exceeded at G-78 (maximum observed of 23.81 feet), no flow has been recorded al the site during the three years of monitoring (with probably the assumption that the structure is normally closed). 3.4 HYDROLOGIC SYSTEM AND WATER BUDGET The C-23, C-24 and C-25 basins are the three major drainage basins in St. Lucie County. The total drainage area is 499.1 square miles, with 53 percent located in the county. The major hydrologic components for the county, as presented in Figure 39, include contribution from rainfall from the three drainage basins, and the outflow components located atl. structures S-49, S-97 and S-99. Inter-drainage basin transfers through G-81 and G-78 are not monitored and could be reasonably neglected in any individual water budget analysis. Rainfall contribution to the system accounts for 1.4 million acre-feet (AF). About 30 percent of the rainfall is leaving the system as runoff through S-49, S-97 and S-99, while 70 percent is going into groundwater storage and consumptive use (CU). Flow hydrographs at the outflow structures are about the same and reflect the seasonal rainfall pattern in the area. Total outflow from the three structures S-49, S-97 and S-99 are plotted against areal rainfall in Figure 40. Rainfall-runoff relationships are described in Figure 41 for period 1965-1999 (35 years). The linear and the nonlinear relationships give about the same results for monthly rainfall less than 10 inches. The double mass curve plotted for cumulative outflow and rainfall (Figure 42) shows that the outflow-rainfall relationship is relatively constant through the years with a coefficient of determination of 0.99.

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1000000 16000.00 1600.00 14000.00 S12000.00 0000.00 C;IWU H L V.O so5000.00 4000.0 I .1 I I... 1.1 I I i .iI I .1 .11 I I .11 1 liii1 I ;;i------i-----t--i---it---ii I... I I .1 I i i. I I, Hi 200.00 j0. Sm iiLj 10.00 IC Sj rr~ Figure 40. Daily rainfall and total outflow from the C-23, C-24 and C-25 basins (Period: 1965-1999) R'056522 y -"unxx n e.ie .n1 s 2.U 4 00 600 8.00 10.00 12.00 14.00 18.00 16.00 20.00 Figure 41. Relationship between monthly rainfall and total monthly outflow from C-23, C-24 and C-25 basins (Period: 1965-1999) r i I 51 8 ~ t l rllluuru YIY~~rYYIIYUIIUY1'"YYYU r --tl 1Il bl Illtll..ILI ,,... d l.L~ ll.l l illi idlh. .,IL .Lk lii ll ,IIL. 11,.. I i i i ii i L-111i Y~YY n Totl Outll ow

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0.00 200.00 400. 00 00000 800.0 1000.00 1200.00 Culll tive ain8 ill (In) Figure 42. Double mass curve for cumulative annual rainfall ard cumulative total annual outflow in C-23, C-24 and C25 basins (Period: 1965-1999) o 400.00 300.00 250.00 200.00 150.00 100.00 50.00 000 4 11 ~1 JF I I~rI ... ....-. 50.00

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4. SUMMARY This report has presented a summary of the hydrometeorologic data for St. Lucie County (rainfall, evaporation, stage and flow), as available in the District corporate database DBIHYDRO. A methodology to fill missing data has been presented. The resulting data have been presented in tabular and graphical formats for the convenience of the reader. Four rainfall sites have been selected out of 16 sites to better describe the rainfall distribution in the area: BLUEGOOS_R, COW CREE_R, FORT PIE_R and SCOTTOG_R. Wet and dry seasons have been depicted from the computed areal rainfall. The wet season goes from June to October and accounts for 61 percent (32.38 inches) of the mean total annual rainfall (52.74 inches). September is the wettest month with a mean monthly rainfall of 7.68 inches. Within the 86-year period of record (19141999) the wettest and driest years were 1917 (32.05 inches) and 1947 (77.76 inches), respectively. Two pan evaporation sites have been selected out of five for the area: FT. P12_E and FT. PIER_E. More than 70 percent of the evaporation occurs during the period March to September. Mean monthly values vary from 5.10 to 5.32 inches in the two sites, while mean annual values vary from 61.20 to 63.89 inches. Flow data have been presented for the major structures where flow is available (c.g., S49, S-50 and S-99), while stage data covers most of the major canals and structures located in the county (C-23, C-25, G-78, G-79, G-81, S-49, S-50 and S-99). Mean daily flow varies from 171 cfs to 190 cfs in the three flow structures, while mean maximum daily varies from 1,204 cfs to 1,512 cfs. In terms of operations of the system, based on the stage elevation data, it can be stated that: (i) although headwater elevation has been kept above the weir elevation at S50, some saltwater intrusion issues may arise during the end of the dry season; (ii) operation of S-99 falls mainly in the low range condition; (iii) S-49 has been operated during flood season and normal conditions, (iv) no flow has been allowed through G-81 since stages on either sides of the structure never exceeded the weir crest elevation, and (v) although G-78 was kept closed and flow was not monitored, the gate have been overtopped several times. Rainfall plays a major role in the hydrologic system in St. Lucie County. The C23, C-24 and C-25 basins (53 percent being in St. Lucie County) received an average of 1.4 million of acre-feet of rainfall per year, with 70 percent going into groundwater storage and consumptive use, and the remaining 30 percent leaving the system through the structures S-49, S97 and S-99. Rainfall-outflow models have been presented for the three drainage basins with a poor relationship (r2 = 0.56). However a strong relationship (rq = 0.99) has been found in plotting a double mass curve for cumulative outflow and rainfall, which showed that the rainfall-outilow relationship is relatively constant through the years.

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The preferred data sets, as developed in this report, are stored in the following preferrn-ed dbkeys: N2471 (S-99), N2470 (S-50), and TW223 (S-49).

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REFERENCES I. Attaway, J. 1999. Hurricanes and Florida Agriculture. Published by Florida Science Source, Inc., Lake Alfred, Florida. 2. Cooper, R. and T. Ortel. 1988. An Atlas of St. Lucie County Surface Water Management Basins. Technical Memorandum DRE 265. South Florida Water Management District, West Palm Beach, Florida. 3. Gray, 1). 1970. Handbook on the Principles of Hydrology. Water TInormation Center, Huntington, New York. 4. Raymond, J. 1999. Hydrologic Report for Martin County. Technical Memorandum WRE 381. South Florida Water Management District, West Palm Beach, Florida. 5. Van Horn, S. 1996. Hydrometeorologic Monitoring Network Metadata Report. Water Resource Evaluation Department, WRE 344. South Florida Water Management District, West. Palm Beach, Florida. 6. Water Resources Evaluation Department. 1994. Standard Operating Procedures For lydrometcorologic Data Collection and Validation in Support olf the Everglades Water Conditions Report. Hydrologic Data Management Division, South Florida Water Management District, West Palm Beach, Florida.

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APPENDICES

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APPENDIX A Historical Rainfall Data

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a i $ m Date Figure Al. Daily rainfall at stati on BLUEGO(OS_R 70.00 Yealy mean: 51.10 in iL t J 40.00 so uo 20.00 10.00 0 r L-i_ 2. r ...; q~ 1979 1980 1981 1918 1 184 1985 1986 1987 1988 1959 1990 1991 1992 1993 1994 1995 1996 1997 1998 199A Year Figure A2, Annual rainall at station RLUEI;GOOS_R n LI IL r .. all IIE 'm.= i ..l "". .00 ~TITILi --. --,, :-I 1 I: i

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.5 4 3 2 1 0 Figure A3. Daily rainfall al. stalion COWCREE_R B0.00 ...... ..... .. .. .. ....... ....... D.00 Year Figure A4. Annual rainfall at station COWCREE_R

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I cOnT PIar.F I Date Figure A5. Daily rainfall at station FORT PTE_R C.CO CD IC C' S' ~ 5 -: C O C 0) CJ l C Figure A6. Annual rainfall at station FORT PIE_R 90.00 80.00 70.00 60.00 E 50.00 20.00 10.00 0.00 0 0n I I

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10 7 ----4 .--.. p 2 UIILII UMII I l IdU iii 2I "w CC r C = 7 7C C', 7 0)7 Date Figure A7. Daily rainfall at station SCOITOG_R Year Figure AS. Annual rainfall at station SCOT) I00 _R 7 ELI (Missingi U -ni I I I ~PnY~IU~YU

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APPENDIX B Monthly and Annual Rainfall Statistics

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Table B ,. Monthly and annual rainfall (inches) at station B.IJEGOOS. R Month Year Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total 1979 3.62 0.08 1.25 2.12 6.26 9.15 7.32 6.13 13.34 1.99 2.01 1.14 54.41 1980 4.08 1.57 1.58 1.98 2.98 3.59 6.76 7.78 2.50 2.07 1.93 1.62 38.44 1981 0.60 2.06 0.84 0.85 4.10 3.26 1.62 14.28 6.43 1.59 1.41 0.18 37.22 1982 0.48 3.75 8.39 3.76 4.40 9.27 9.84 11.41 4.73 1.18 4.56 1.62 63.39 1983 4.21 8.36 4.01 2.15 1.06 8.39 2.45 8.45 11.02 7.14 0.68 5.37 63.29 1984 0.15 2.32 5.70 1.23 4.40 7.23 9.16 5.71 8.26 1.43 7.04 0.45 53.08 1985 1.02 0.18 4.01 5.21 1.39 2.91 9.21 5.88 12.10 4.55 1.73 1.73 49.92 1986 2.88 0.92 5.09 0.29 3.47 14.31 9.93 6.61 2.48 3.36 1.84 2.90 54.08 1987 1,15 1.11 6.55 0.48 2.47 3.45 4.69 1.72 8.54 8.62 6.44 0.31 45.53 1988 2.76 2.99 4.15 3.49 2.72 7.16 8.03 6.91 0.71 1.83 4.07 0.94 45.76 1989 1.40 0.16 3.16 3.67 1.20 4.56 4.30 7.61 1.93 3.51 0.41 2.57 34.48 1990 0.78 2.22 0.96 0.29 2.07 2.27 6.90 8.88 10.23 4.06 1.05 0.11 39.82 1991 3.68 2.47 2.97 6.32 3.02 4.56 5.59 4.48 2.82 5.34 1.19 0.87 43.31 1992 0.27 2.45 1.29 2.47 1.53 18.67 6.86 14.01 4.00 1.11 8.45 1.70 62.81 1993 10.92 2.49 6.15 1.86 4.51 5.68 6.32 5.99 3.90 6.19 4.08 0.85 58.94 1994 4.94 3.61 3.49 8.41 5.33 7.35 7.88 5.77 8.64 5.23 8.89 4.94 74.48 1995 2.01 1.32 2.01 2.90 1.57 4.63 5.12 13.93 8.18 17.30 0.00 0.70 .59.67 1996 1.10 0.38 11.59 1.09 4.34 7.49 2.45 7.30 4.08 5.14 3.66 1.25 49.87 1997 1.36 1.66 1.99 6.10 3.29 4.06 8.47 8.01 4.36 2.06 3.71 3.67 48.74 1998 2.97 5.99 4.53 0.66 3.30 1.97 3.67 5.24 9.90 1.88 7.29 0.46 47.86 1999 2.21 0.70 0.74 2.46 2.13 14.75 1.17 5.36 5.50 11.07 1.04 0.92 48.05 Statistic Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dee P.O.R.* Mean 2.50 2.23 3.83 2.75 3.12 6.89 6.08 7.69 6.36 4.60 3.40 1.63 51.10 Stand. Dcv 2.40 2.00 2.76 2.20 1.43 4.43 2.71 3.27 3.65 3.94 2.76 1.48 10.12 Minimum 0.15 0.08 0.74 0.29 1.06 1.97 1.17 1.72 0.71 1.11 0.00 0.11 34.48 Median 2.01 2.06 3.49 2.15 3.02 5.68 6.76 6.91 5.50 3.51 2.01 1.14 49.87 Maximum 10.92 8.36 11.59 8.41 6.26 18.67 9.93 14.28 13.34 17.30 8.89 5.37 74.48 : indicates period of records for station and excludes partial year results ** : indicates partial year -: indicates no data available or large gaps of missing data Bold number: indicates estimate from monthly correlation with Fort Pierce Field Station BLUEGOOS_R = (FT.PIER_R x 0.82) + 0.54; R7 = 0.68

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Table B2. Monthly and annual rainfall (inches) at station COW CREE_R Year Month Jan Feb Mar Apr May Jun Jol Aug Sep Oct Nov Dec Year Total SIalistic Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec P.O.R.* Mean 2.01 2.24 3.06 2.56 3.85 7.33 5.68 6.58 5.72 3.38 2.24 1.64 46.28 Stand. I)Dv 1.60 1.65 2.51 2.37 2.31 3.99 2.42 3.99 3.58 2.75 1.82 1.52 9.28 Minlinunm 0.15 0.04 0.00 0.00 0.78 2.20 1.71 0.90 1.52 0.10 0.06 0.00 32.18 Median 1.75 1.79 2.80 1.77 3.17 5.98 5.02 6.68 5.33 2.85 1.90 1.10 45.84 Maximum 7.66 6.13 10.01 9.45 11.82 17.41 12.08 20.52 18.66 12.07 7.32 6.91 68.17 : indicates period of records for stationii and excludes partial year results **; indicates partial year -: indicates no data available or large gaps of missing data Bold number: indicates estimate from monthly correlation with Fort Pierce Field Station COW CREE_R = (FT.PIER R x 0.77) + 0.53; R = 0.72

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Table B3. Monthly and annual rainfall (inches) at station FORT PIE_R Year 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 192!) 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 195!) 1960 1961 Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Total

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Table B3. Continued Year Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Total 46.56 62.19 55.99 38.30 57.01 39.47 54.49 67.94 58.50 46.59 52.38 53.82 49.93 43.40 42.16 44.56 59.37 51.44 46.04 40.1.9 66,87 64.58 50.19 55.98 60.12 44.80 32.66 36.51 43.31 65.02 52.29 72.20 80.39 75.67 56.23 61.23 60.09 Statistic Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec P.O.R.* Mean 2.43 2.75 3.22 3.20 4.31 5.83 5.63 5.82 8.01 6.83 2.94 2.16 53.14 Stand. Dcv 2.06 2.07 2.44 2.64 2.46 3.11 2.61 3.05 3.88 3.75 2.35 1.78 10.66 Minimum 0.19 0.22 0.19 0.17 0.37 0.50 1.21 1.09 0.75 0.60 0.09 0.13 32.05 Median 1.98 2.11 2.69 2.22 4.16 5.45 5.45 5.31 7.19 6.41 2.28 1.48 52.29 Maximum 9.46 9.70 12.46 11.16 12.97 15.84 13.17 17.66 19.90 19.31 10.65 8.21 80.39 *: indicates period of records for Saliat n d cxclhdes partial year results ** : indicates partial year -: indicates no data available or large gaps of missing data Bold number: indicates estimate from monthly correlation with Stuart FORT PIE .R = (STUART_R 0.85) + 0.18 R2-0.87

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Table 1B4. Monthly and annual rainfall (inches) at station SCOTTO G_R Month .lan FIrb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Statistic .lan Feb Mar Apr May Jun Jul Atug Sep Oct Nov Dec P.O.R.* Mean 2.48 3.30 3.34 3.03 4.96 7.34 7,65 7.18 8,56 5.72 3,00 2,11 58,67 Stand. Dev 2.13 2,44 2.76 2.77 3.16 4.23 3.64 3.55 4.95 3.86 2.01 2.09 13.31 Minimtun 0.10 0.10 0.01 0.02 0.44 0.60 1.11 1.01 0.72 0.30 0.49 0.01 40.79 Median 1.96 2.73 2,99 2.63 4.36 6.62 6.77 6.33 7.49 4.90 2,34 1.63 56.63 Maximnum 8.80 10.60 11,99 12.70 14.25 19.50 15.75 16.65 28.20 15.57 7.90 8.50 96.20 : indicates period of records foir latim lnnd excluds partial year results i"': indicates par.ial year -: indicalics no data available or large gaps of missing dln Bold number: indicates estimate from monthly correlation with Fort Pierce SCOTTO G_R = (FORT PIE_R x 0.91) + 0.87; R' = 0.52 Year 'Total 66.58 41.07 53.05 56.40 58.80 60.80 71.78 43.73 50.20 62.63 48.84 46.47 41.16 58.26 47.86 48.55 55.69 78.25 77.65 84.60 62.55 56.55 96.20 59.14 58.04 58.77 62.44 46.07 40.79 42.88 51.41 80.32 57.76 74.66 83.52 56.71 45.77 55.47 51.76 53.61

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Table B5. Monthly and annual areal rainfall (inches) in St. Lucie County Year 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1!953 1954 1955 1956 1957 1958 1959 1960 1961 Month Jan Feb Mapr May Jun Jul. Aug Sep Oct Nov Dc 2.86 2.95 0.62 4.53 3.29 3.05 7.17 4.28 11.13 5.93 4.18 3.44 9.36 2.24 2.74 1.36 2.25 5.41 8.81 7.91 7.44 10.88 3.35 1.89 1.83 2.05 0.60 1.84 4.04 5.75 3.53 2.98 8.06 10.34 2.94 1.19 0.90 3.23 0,19 0.44 1.18 4.66 5.09 3.18 6.67 3.37 0.49 2.65 3.51 0.69 4.38 6.74 1.35 6.30 8.21 2.74 14.22 6.02 0.89 1.31 2.16 4.30 5.684 2.15 2.94 4.13 9.43 5.33 2.82 0.60 7.32 2.14 7.38 1.97 2,13 4.22 4.50 2.83 5.91 5.32 9.67 4.14 3.50 0.78 0.43 1.99 1.56 1.36 6,26 1.96 6.90 1.63 0.75 11.31 0.98 1.02 2.18 3.19 0.60 0.65 2.54 2.94 4.34 5.88 8.44 10.46 2.10 0.67 1.28 0.30 0.79 4.84 7.72 8.40 5.39 1.09 8.50 2.93 0.46 1.12 5.16 1.47 3.63 2.22 4.42 0.69 7.38 1.41 7.19 19.31 0.38 1.28 4.99 2.15 3.31 1.75 7.16 5.21 6.44 5.49 1,91 1.79 10.65 6.77 7.48 1.84 2.40 4.75 0.72 9.52 12.74 7.74 11.07 1.88 0.71 1.03 0.65 0.78 1.56 1.21 0.92 2.00 4.93 5.13 11.81 10.27 1.95 0.56 1.04 1.27 3.56 0.25 3.88 3.98 2.84 14.57 4.72 3.50 1.70 0.35 1.89 0.59 2.32 1.46 11.09 6.85 5.45 3.04 6,97 8,.76 1.60 2.51 1.78 5.28 5.43 7.72 7.41 11.88 2.78 3,84 7.34 4.78 2.90 3.49 3.27 0.79 3.76 11.16 1.80 1.17 6.39 4.12 6.89 6.37 1.48 1.37 1,45 1.44 3.04 1.74 4.16 12.90 1.48 6.41 5.44 4.05 6.86 0.94 1.98 1.18 4.23 9.86 1.65 5.45 2.98 8.87 6.36 12.97 3.62 0.75 1.49 5.54 2.12 5.44 5.72 4.97 2.89 4.00 3.68 3.09 1.06 1.32 0.22 1.61 0.27 5.31 3.44 9.15 4.00 3.57 6.53 10.63 0.77 0.99 1.83 5.86 3.44 2.74 5.87 12.00 3.81 2.60 10.33 6.41 4.54 4.42 1.60 4.55 9.08 5.09 9.90 2.80 3.32 4.75 7.75 12.46 6.94 0.93 0.46 1.11 0.49 0.39 3.25 5.72 3.95 2.65 8.42 6.46 4.07 1.25 0.48 0.46 1.11 5.16 4.61 4.59 6.21 3.30 5.12 10.42 1.55 1.12 2.98 2.53 4.92 0.96 3.76 6.34 5.16 5.55 12.40 1.95 0.23 3.51 5.92 5.64 3.03 7.51 3.02 5.73 8.23 3.74 14.19 5.80 6.30 4.32 2.16 4.24 6.17 1.17 7.94 7.65 1.94 2.43 5.95 1.84 0.87 5.10 0.29 1.28 5.57 1.11 4.96 5.10 6.65 9.29 6.30 5.84 2.65 0.59 1.10 0.27 1.73 6.74 2.15 7.46 5.82 4.49 4.90 11.56 1.55 0.57 1.16 0.37 1.51 1.69 0.98 4.23 4.32 5.38 17.05 6.74 4.28 4.17 1.20 0.77 2.32 0.42 6.75 3.71 5.23 5.53 6.23 4.75 3.13 3.55 1.42 3.48 6.75 4.62 5.23 5.58 8.79 6.97 15.22 12.35 6.03 1.32 5.11 0,58 2.27 5.10 4.27 3.74 5.56 9.70 14.31 4.78 1.43 1.11 1.01 1.88 0.81 2.97 3.53 6.90 4:67 12.16 8.97 5.80 0.37 5.57 0.68 1.88 4.04 3.28 3.83 3.68 4.21 12.12 8.59 11,01 2.48 0.72 0.31 2.11 0.76 10.25 3.84 4.02 3.11 5.21 7.03 10.73 3.28 0.84 2.45 7.08 2.31 2.11 1.57 0.50 6.96 7.58 5.48 13.50 0.55 1.32 1.98 1.40 9.83 3.36 1.41 5.81 4.27 6.58 7.16 10.14 4.40 1.32 2.32 1.92 2.13 10.82 4.91 12.48 5.92 5.81 9.50 7.46 6.08 0.60 1.64 1.32 2.41 3.26 4.24 7.43 3.35 7.35 4.83 7.67 0.09 4.98 0.41 2.76 0.53 2.76 2.03 1.58 5.73 4.03 7.82 10.51 0.55 0.90 0.99 3.87 5.03 5.31 5.22 5.72 10.67 6.77 6.93 7.69 1.96 2.56 8.39 0.88 3.49 2.00 6.88 5.70 1.79 5.70 3.15 8.94 0.81 4.07 2.52 0.96 7.76 1.41 4.54 13.51 4.97 5.86 10.55 11.41 3.78 2,92 0.57 6.19 4.15 5.98 4.49 6.60 6.21 7.86 16.38 4.86 0.93 1.23 3.17 0.97 3.78 1.07 7.12 5.49 1.34 6.85 3.42 4,45 1.71 0.35 Ycar Total 53.43 63.64 45.15 32.05 5 6.36 48.96 52.35 36.15 43.99 42.82 54.54 57.62 61.88 41.77 41.66 52.53 64.63 48.57 49.91 59.90 41.32 46.49 63.85 69.17 38.22 44.13 50.29 73.43 47.46 49.63 48.34 51.88 43.59 77.76 57.96 54.64 56.52 51.49 51.41 57.66 69.95 48.57 39.61 62.72 51.80( 70.19 65.44 39.69

PAGE 72

'Table 15. Continued Year Month .lan I Fel Mar Apr May Jun Jul Aug Sep Oct Nov Dec. Year Total Statistic Jan Feb Mar Apr May .Jun .ll Aug Sep Oct Nov Dec P.O.I.* Mean 2.37 2.57 3.15 3.23 4.23 6.26 5.88 6.07 7.68 6.49 2.77 2.03 52.74 Stand. Dev 2.05 1.88 2.34 2.62 2.36 3.40 2.36 2.91 3.55 3,80 2.15 1.72 9.51 Minimum 0.22 I.21 0.19 0.18 0.41 0.50 1.34 1,09 0.75 0.46 0.09 0.07 32.05 Median 1.89 2.08 2,73 2.33 3.97 5.62 5.86 5.56 7.10 5.97 2.16 1.32 51.84 Maximum 9.36 8.33 11.51 11.16 11.27 16.24 12.74 14.95 18.61 19.31 10.65 8.36 77.76 : indicates perod of records fbr station and excludes partial year results : indicates partial year -: indicates no data available or large gaps of missing data

PAGE 73

APPENDIX C Historical Evaporation Data

PAGE 74

0.4 IFORFIEPRCE Date Figure Cl. Daily pan evaporation at station FT. PT2_E 30.00 ,fl~M -. a6kP a b la I c aaa aaa Figurc C2. Annual pan evaporation at station FT. PI2_E 64. n C or T ................ .................. .......... ....... ....... .. ........... .. ............................... .................... ............... ..... .... .. ...... ................................ ... ........................ ..... ....................... ............................................. ... .......... ...... ---------------------i

PAGE 75

[ FORT PIERCE FIELD STATION I 1 .... .. .... .. ........ ..... ...... ... .... 44 ~3 I~ i. -r 1r-K r.P. ----rr-Date Figure C3. Daily pan evaporation at station FT. PIER_E FORT PIERCE FIFLO STATION early mean: 1 2 in --I tt PA t~ttk~ht~stli il.i L ] .K .. S V tl H I -hH L ......... 7" IJ 1962 1983 1984 1985 1988 1987 1988 1989 1990 1991 1992 1993 199 9 1Y9 1996 1997 1998 Year Figure C4. Annual pan evaporation at statilon FT. PIER_E 65 0.40 """ ---------------^ 15 OU w 4 .......... ~~i~i~~l~~~ii~ I II ")I 0", ---

PAGE 76

APPENDIX D Monthly and Annual Evaporation Statistics

PAGE 77

Table Dl. Monthly and annual evaporation (inches) at station FT. PT2_E Month Year Year Jan Feb Mar Apr May Jun ,)ul Aug Sep Oct. Nov Dec Total 1975 4.06 4.59 7.08 7.54 8.05 6.69 6.54 6.50 5.30 5.54 3.97 3.95 69.81 1976 3.90 4.67 6.26 7.14 6.86 7.20 6.81 7.01 4.99 5.73 3.59 3.55 67.71 1977 3.53 4.24 6.40 8.00 7.88 7.48 6.98 7.27 6,.67 5.41 4.55 3.07 71.48 1978 3.59 3.45 6.00 6.81 7.09 7.16 7.63 7.07 5.97 5.39 4.36 3.50 68.02 1979 3.91 3.94 5.93 7.14 6.93 7.85 7.93 6.52 5.62 5.41 4.22 3.16 68.56 1980 3.57 3.96 6.15 6.71 6.89 8.79 8.30 6.87 5.94 5.60 4.54 3.46 70.78 1981 3.48 4.34 6.14 7.73 9.00 6.81 7.83 6.65 5.54 5.08 3.78 3.67 70.05 1982 3.55 3.53 5.39 6.05 7.31 5.94 6.58 6.00 4.64 4.53 3.57 2.96 60.05 1983 2.93 3.63 5.70 6.52 7.77 7.25 7.21 6.53 5.80 4.34 3.45 3.07 64.20 1984 2.99 3.78 5.88 6.11 5.89 6.64 6.42 5.69 6.39 6.14 4.09 3.37 63,39 1985 3.20 4.25 5.83 6,.41 8.27 6.97 6.07 5.76 5.48 5.02 4.23 3.91 65.40 1986 3.56 3.29 5.83 7.65 8.24 7.32 8.23 7.25 6.79 6.07 4.19 3.62 72.04 1987 3.55 4.01 5.44 6.63 6.74 7.75 8.80 7.88 6.68 4.69 4.13 3.46 69.76 1988 3.31 3.76 5.70 7.40 7.35 5.65 5.12 5.75 5.82 5.44 4.00 3.06 62.36 1989 3.48 3.85 5.22 6.26 7.87 7.44 6.17 6.91 6.31 6.10 3.39 2.61 65.61 1990 3.37 4.32 5.71 6.61 7.14 7.13 6.96 5.68 5.24 4.64 3,78 3.05 63.63 1991 2.24 3.53 4.99 6.03 6.90 5.79 6.27 6.08 4.72 4.16 3.16 2.92 56.79 1992 2.75 3.56 5.16 6.01 7.45 5.83 7.09 5.24 4.88 4.41 3.33 2.58 58.29 1993 2.76 3.33 4.79 5.77 6.41 6.75 7.03 5.94 5.70 4.21 3.37 2.84 58.90 1994 3.21 3.74 5.53 6.15 7.05 5.52 6.30 5.48 4.27 4.49 3.49 2.60 57.83 1995 2.74 3.67 5.59 5.79 7.38 5.97 6.05 6.07 5.30 4.46 3.42 2.46 58.90 1996 2.82 3.41 5.69 6.18 6.56 6.40 7.70 6.45 5.62 4.30 3.75 3.09 61.97 1997 3.02 3.20 5.13 5.15 6.07 5.85 5.95 5.24 4.70 4.10 3.18 3.14 54.73 1998 2.67 4.35 5.20 4.35 5.06 5.45 3.86 7.75 4.99 3.90 3.83 2.23 53,64 1999 2.94 3.84 6.19 5.94 5.92 5.11 6.79 6,37 6.30 5.77 4.69 3.60 63.46 Statistic Jan Feb Mar Apr May Jun Jul Au l Sep Oct Nov Dec P.O.R.* Mean 3.25 3.85 5.72 6.48 7.12 6.67 6.82 6.40 5.59 5.00 3.84 3.16 63.89 Stand. Dev 0.45 0.41 0.51 0.84 0.87 0.90 1.06 0.73 0.69 0.70 0.45 0.45 5.46 Minimum 2.24 3.20 4.79 4.35 5.06 5.11 3.86 5.24 4.27 3.90 3.16 2.23 53.64 Median 3.31 3.78 5,70 6.41 7.09 6.75 6.R I 6.45 5.62 5,02 3.78 3.09 63.63 Maximtm 4.06 4.67 7.08 8.00 9.00 8.79 8.80 7.88 6.79 6.14 4.69 3.95 72.04 : indicates period of record ** : indicates partial year fur staliun and excludes partial year results -: indi eles no i dah available or large gaps of missing dtla

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Table D2. Monthly and annual evaporation (inches) at station FT. PIER_E Month Year Year Jan Feb Mar Apr May Jun Jlul Aug Sep Oct Nov Dec Total 1982 3.17 3.16 5.35 5.55 6.27 5.25 6.25 5.54 4.69 4.04 2.93 2.81 55.01 1983 1.94 3.04 4.78 5.88 6.99 5.87 6.77 5.34 5.13 4.36 3.22 2.95 56.27 1984 2.80 3.54 5.15 6.02 6.05 6.02 5.21 5.75 5.24 4.13 3.09 2.70 55.70 1985 3.02 3.37 5.78 5.73 7.09 6.58 5.92 5.08 5.01 4.63 3.65 2.73 58.59 1986 2.86 3.68 4.96 6.79 7.08 6.24 6.49 5.93 5.56 5.08 3.11 3.57 61.35 1987 3.00 2.95 4.23 5.87 6.33 6.74 6.59 6.04 5.92 4.34 2.95 2.82 57.78 1988 2.14 2.77 4.92 6.16 7.31 6.24 5.73 5.93 5.66 4.37 3.39 3.29 57.91 1989 4.41 3.74 5.25 5.87 6.90 6.45 5.56 5.64 6.39 4.33 3.07 2.85 60.46 1990 3.66 3.88 5.11 5.83 6.38 5.85 6.04 5.96 5.58 4.55 2.72 3.23 58.79 1991 2.59 2.96 3.67 4.33 6.09 6.07 6.23 6.33 5.72 4.73 3.17 3.33 55.22 1992 3.29 3.47 4.74 6.19 7.44 5.54 6.71 6.06 5.30 4.17 3.39 3.24 59.54 1993 4.11 4.01 5.77 6.88 7.99 8.22 7.45 7.25 5.92 5.89 3.94 2.50 69.93 1994 3.42 4.05 5.41 7.08 7.57 7.93 7.88 5.96 4.85 4.64 3.34 3.12 65.25 1995 3.30 3.62 5.86 5.97 7,70 7.46 8,26 8.03 5.83 5.67 3.31 2.80 67.81 1996 3.03 4.12 7.25 6.45 7.69 7.23 8.59 6.51 5.82 3.86 3.37 3.99 67.90 1997 2.70 2.86 5.08 7.59 5.97 7.57 6.98 7.20 6.49 4.83 4.90 3.73 65.90 1998 3.35 4.41 5.76 6.69 7.24 8.09 7.96 8.06 3.48 5.14 4.13 2.71 67.02 Statistic .Ian Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec P.O.R.* Mean 3.11 3.51 5.24 6.17 6.95 6,67 6.74 6,27 5.45 4.63 3.39 3.08 61.20 Stand. Dev 0.62 0.49 0.77 0.73 0.65 0.92 0.99 0.87 0.71 0.55 0.52 0.41 5.03 Minimum 1.94 2.77 3.67 4.33 5.97 5.25 5.21 5.08 3.48 3.86 2.72 2.50 55,01 Median 3.03 3.54 5.15 6.02 7.08 6.45 6.59 5.96 5.58 4.55 3.31 2.95 59.54 Maxilmumr 4.41 4.41 7.25 7.59 7.99 8.22 8.59 8.06 6.49 5.89 4.90 3.99 69.93 : indicates period ol records for station and excludes partia year results ** : indicates partial year -: indicates no data available or large gaps of rissing data Bold number: indicates estimate from monthly correlation with Fort Piorce FT.PIERE = (FT.P12_E x 0.91) -0.063 R2= 0.99

PAGE 79

APPENDIX E Historical Daily Flow Data

PAGE 80

45000 4000 ------.--------------__ 3000 ---. -----. ..3000 .-2500 -2000 -..M .-..... -..........-150 -----------1500 --500 Figure El. Mean daily flow at S-49 -..n 3000 2500 2000 1000 0 .. .-..-_ -. --_ .-......--.l Figure E2. Mean daily flow at S-50 70

PAGE 81

,2nn~ 3000 2500 2000 1500 1000 500 0 Figure E3. Mean daily flow at S-99 m em m m a nistm m < 5 n5 i5 [3 HDa Date 55nn

PAGE 82

APPENDIX F Monthly and Annual Flow Data Statistics

PAGE 83

Table Fl. Mean daily flow at S-49 (cfs) Month .lan Feb Mar Apr May J.un .lul Aug Sep Oct Nov Dec 0 1 5 26 32 3 0 0 12 1 111 12 33 51 11 41 11 0 0 17 280 101 16 132 252 28 0 0 0 138 6 46 0 166 1428 45 358 86 275 156 372 434 159 0 45 9 70 0 1 84 70 51 124 192 413 94 57 46 39 229 0 0 0 0 198 0 0 0 125 186 6 51 49 295 584 21 23 0 0 8 64 134 9 25 115 81 5 0 301 129 85 18 88 19 23 0 0 0 0 0 19 322 425 276 764 712 492 97 0 130 87 146 16 44 76 0 52 111 0 8 0 33 0 0 330 15 118 28 0 0 89 75 0 62 55 0 21 8 7 0 52 22 0 0 55 133 253 358 56 357 2 0 0 0 483 268 736 132 0 31 640 94 66 196 760 69 147 24 0 17 0 281 209 92 372 25 1 304 104 388 531 396 5 190 6 34 0 0 0 701 143 554 1093 397 16 0 110 79 139 452 472 76 108 16 140 228 336 300 102 470 134 8 221 177 447 27 205 230 86 812 978 677 140 185 167 492 299 225 291 297 57 94 45 24 260 215 430 377 696 727 140 88 326 282 239 139 207 96 253 32 11 122 329 38 157 170 92 122 129 119 1210 467 45 27 132 0 17 307 400 27 783 729 335 197 26 241 393 623 291 176 345 156 361 439 815 283 297 532 159 111 181 63 111 299 236 283 72 0 116 458 168 196 249 259 553 944 865 411 259 485 571 766 408 121 288 111 301 593 236 411 658 334 216 1134 622 1512 227 63 119 360 483 722 191 60 98 287 689 148 424 352 553 1208 Year Average Statistic Jan Feb Mar Apr May Jun Jul Aug Sip Oct Nov Dec P.O.R* Mean 103 105 120 63 71 226 255 320 363 318 124 59 171 Stand,Dcv 167 177 171 104 97 300 207 269 289 332 172 110 95 Minimum 0 0 0 0 0 0 11 0 45 0 0 0 24 Mcdian 29 38 51 12 22 122 222 270 275 213 59 26 152 Maximum 681 712 736 425 301 1,428 865 1,134 1,210 1.512 663 558 396 *: indicaes period of rcords for slaion and excludes purli Al year results **; indicates partial year --': indicates 0o clata available or largc gaps of missing data Year

PAGE 84

Table F2. Mean daily flow at S-50 (cfs) Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec YAr 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 J994 1995 1996 1997 1998 1999 10 74 183 39 2 0 228 311 185 62 131 436 4 11 8 0 0 202 7 9 8 0 56 971 45 7 445 53 324 170 230 142 370 153 9 64 5 12 3 5 8 150 36 95 55 32 99 514 61 176 35 36 16 406 36 4 3 1 0 297 17 10 7 0 86 304 5 0 0 0 324 507 45 0 0 0 0 33 69 47 .147 0 18 188 275 42 14 0 460 53 16 60 34 152 14 11 0 57 0 0 0 6 26 64 182 267 175 498 -638 349 91 4 237 114 98 191 6 24 50 8 0 40 85 16 78 61 14 56 1 1 244 194 51 98 26 0 8 19 65 102 11 114 132 0 0 99 56 64 0 21 57 32 0 0 98 164 79 278 290 135 271 0 2 3 85 0 902 464 250 803 176 4 57 151 331 109 57 127 505 162 185 317 59 0 13 0 0 186 100 75 354 21 12 24 204 115 293 308 483 483 28 286 13 12 18 3 1 12 484 97 250 572 74 239 370 484 527 1145 71 Year Average Slallistic Jrn Feb Mar Apr May Jun Jul Aug Sep Oct Nov DTc P.O.R* Mcan 83 97 139 59 77 244 294 361 343 306 143 60 180 Stand.Dev 111 145 179 78 113 245 207 218 212 272 162 91 76 Minmum 0 0 0 0 0 4 53 75 0 1 0 46 Median 31 51 56 32 16 188 245 341 313 248 71 34 167 Maxinnmr 464 638 803 290 460 971 872 869 930 1,145 649 361 334 *: indicates period of records for station and exciluldes partial year results **: inlicales parlial ycar --. indicates no data availahle or large gaps of missing data 235 199 109 248 390 497 465 715 540 203 113 193 791 229 211 350 108 557 631 664 105 179 146 469 370 375 494 481 306 153 313 5 476 599 635 529 872 821 362 209 279 341 252 270 288 240 254 55 13 111 342 10 227 384 75 85 82 85 930 308 101 58 94 0 4 296 412 38 552 476 160 203 180 490 336 458 202 270 256 117 356 382 765 239 283 492 206 167 201 53 130 230 245 352 99 0 43 238 288 257 225 645 345 591 686 415 295 382 368 533 323 86 102 82 330 465 222 325 675 318 216 869 516 977 407 132 80 303 359 803 265 61

PAGE 85

Table F3. Mean daily flow at S-99 (fs) Month ,Ian Feb Mar Apr May .Jun Jul Aug Sep Oct Nov Dec Year 1964 1965 1966 1967 1963 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 [985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 -0 84 190 316 189 13 15 0 0 0 380 21 322 3 0 30 17 92 11 9 0 0 0 0 0 0 0 82 180 74 27 86 46 74 2 81 221 658 271 87 181 0 57 21 74 90 122 256 323 0 85 297 141 134 349 0 0 274 956 341 113 192 329 0 273 6 18 471 503 21 0 Yea r Average Stalistic Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec I'.O.R* Mean 95 109 150 64 88 254 302 352 346 310 146 65 190 Stand,Dcv 127 154 196 89 125 253 221 201 234 272 148 100 73 Minimum 0 0 0 0 0 0 7 69 72 0 0 0 6.5 Median 21 74 80 14 22 215 284 338 310 252 93 32 194 Maximum 471 658 956 307 411 1,083 935 801 914 1,204 556 345 332 *: indictles ip:rid of recordsW for sl2lion and excludes ptarLial year results **: i.ndicalcs partial year .indicates no data available or large gaps of missing data 4 24 44 23 3 24 67 141 501 5 0 236 0 57 1083 13 231 0 31 1 34 0 0 42 0 75 521 2 3 305 0 0 314 0 94 382 0 374 521 0 0 40 0 23 194 9 411 43 200 21 22 0 0 0 259 176 500 53 0 188 14 25 56 106 16 86 0 0 315 41 0 358 270 397 289 133 202 0 0 0 149 307 279 304 81 0 891 170 0 161 68 123 439 71 0 11 153 79 333 210 98 275 10 293 0 0 12 474 32 415 911 305 31 266 200 80 198 319 430 539 414 850 268 585 165 72 165 24 865 121 144 320 170 13 522 734 712 .376 116 160 118 487 62 389 375 506 400 322 261 112 167 0 0 422 567 512 494 224 935 774 337 235 7 339 300 222 254 128 295 227 264 62 21 23 156 345 3 31 218 392 89 82 136 99 104 914 274 26 115 69 110 14 46 7 332 390 43 46 482 416 109 176 280 85 232 117 385 78 190 179 183 74 253 347 312 780 192 0 274 494 150 196 247 418 432 456 363 556 357 389 240 208 190 155 347 343 335 108 351 638 365 640 6 701 344 264 500 269 382 557 312 98 167 131 82 309 471 35 161 295 682 282 509 204 768 438 823 19 414 177 128 250 0 358 801 195 31 8 81 233 550 34 229 366 463 497 1204 59

PAGE 86

APPENDIX G Historical Daily Stage Data

PAGE 87

26. ---------------------------------------------25 Daste Figure GI. Mean daily stage at C-23 24 23 2? 21 20 19 r is 17 15 14 w .... --F .-r.-r-. .-.-i -..R .. Date Figure 2,. Mean daily stage at C-25

PAGE 88

2L 24 23 22 0 21 .20 17 18 15 14 Date Figure G3. Mean daily headwater stage at G-78 r ,c1 n Max -23.71 11 Dale: 03/2293 'I 7tZt I lill I -i-Il44~7~1J -t' 11 ii I -jIfg~ -I -4 II F 1 I mln = 15.55 Dlate: u/ .1 ./ .. 4 C. I Figure G.4. Mean daily headwater stage at G-79 4' H Ilk lit T I I" ,LLi-ldll WiHI-j i ll~UCuwl Y1 Rr~ I eM I I I i t I r7YW(T1WII~I i "' I I .._.. .... -----._ .. :: E n G78n

PAGE 89

7 ,, L G] T N 2? 2 s K Figure G5. Mean daily tailwater stage at G-79 15 i 2 2 2? ? ? ? -£ rr-rrr. -aa a 47 C 5. AS Cd < d ci Cs ,i CC C' C ii Cd
PAGE 90

20 S19 1B 17 16 15 Figure G7. Mean daily tailwater stage at G-81 -............................ ..._... .. .. ... ... -'. ....... .._.. .. .... In = 13.45 ft ,ate: 04/27/90 0 ... .. ...... ................ --D)ate Figure G8. Mean daily headwater stage at S-49 80

PAGE 91

0. U Date Figure G9. Mean daily tailwater stage at S-49 N 9-N 5 16 15 14 0 13 12 11 10 9 T C 9 f:. _C :h I -C: C --CW R' Figure 010. Mcan daily headwater stage at S-50 81 ; d n; CD pm. UpC C D ) ---V -----m M 6 N q f

PAGE 92

11, --. [' t 0. r, C') u ~r 0) C)w' ww .? mmm [3 03 e !? -H [ [3 2? 2? 2?f 2? [ ? n n n? ES 2' 2'n M M a Dale. Figure G11k Mean daily headwater stage at S-99 10 -,-..-. -Figure G12. Mean daily tailwater ,Lage at ES ES E S ES S ES "¢ S ES S n= ES v= oS ES ES S

PAGE 93

APPENDIX II Monthly and Annual Stage Data Statistics

PAGE 94

Table HI. Monthly and annual average stage al. C-23 (ft, NGVD) Month Year Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Averasc 1983 -21.80 20.48 22.01 18.96 20.60 19.18 20.72 20.59 21.12 21.41 22.21 ** 1984 22.85 22.54 23.02 22.49 20.11 21.12 20.72 20.42 20.65 20.06 21.64 22.93 21.55 1985 21.77 21.86 21.52 22.73 21,76 20.75 21.35 21.74 21.58 21.72 22.72 22.48 21.83 1986 22.46 22.89 22.43 20.67 20.62 21.93 20.95 21.68 21.62 20.83 22.68 22.56 21.78 1987 22.68 22.98 22.61 21.75 20.60 21.60 21.67 19.72 21.09 22.08 22.36 22.94 21.84 1988 22.67 22.98 22.88 20.25 22.70 20.63 21.84 21.79 20.39 19.95 22.30 21.99 21.70 1989 20.78 20.49 22.31 21.52 20.49 19.40 22.11 22.28 21,53 22.49 21.98 21.37 21.40 1990 22.51 22.39 20.83 19.05 18.03 22.10 22.35 22.06 21.43 22.15 22.80 20.79 21.37 1991 21.54 22.36 22.92 22.68 21.78 21.43 21.58 21.61 21.73 21.64 21.76 22.08 21.92 1992 20.73 21.80 21.81 22.09 16.96 20.59 21.59 20.57 21.35 21.51 22.63 22.80 21,20 1993 22.99 22.76 22.88 22.57 18.23 21.91 21.67 21.28 21.66 21.74 22.11 22.15 21.83 1994 23.02 22.07 22.48 21.78 21.38 21.57 21.59 21.41 21.18 21.44 22.26 21.99 21.85 1995 22.40 22.45 22.53 20.23 19.21 20.49 22.12 20.81 19.21 20.47 20.99 17.48 20,70 1996 20.28 18.87 21.07 21.85 20.63 21.81 19.29 19.58 20.93 20.80 21.51 20.59 20.60 1997 21.50 22.15 20.87 20.82 22.27 21.83 21.80 21.44 20.66 22.40 22.83 22.93 21.79 1998 22.62 21.02 21.59 18.77 18.17 17.79 19.48 21.18 20.84 21.13 22.18 21.87 20.55 1999 22.69 21.02 16.03 15.04 20.84 20.97 21.15 20.87 21.44 20.67 21.78 20.37 20.24 Statistic Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec P.O.R* Mean 22.09 21,91 21,66 20.96 20.16 20.97 21.20 21.13 21.05 21.31 22.11 21,74 21.38 Stand.Dev 0.88 1.06 1.67 1.94 1.65 1.08 0.99 0.76 0.64 0.77 0.54 1.36 0.56 Mirnimunm 20.28 18.87 16.03 15.04 16.96 17.79 19.18 19.58 19,21 19.95 20.99 17.48 20.24 Median 22.49 22.15 22.31 21.75 20.60 21.12 21.59 21.28 21.18 21.44 22.18 22.08 21.62 Maximum 23.02 22.98 23.02 22.73 22.70 22.10 22.35 22.28 21.73 22.49 22.83 22.94 21,92 *: indicates period of records for station and excludes partial year results **: indicates partial year --': indicates no data available or large: gaps of missing data

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lable 12. Monthly and annual average stage at C-25 (ft, NGVD) Month Year Year Jan Feb Mar Apr May Jun ,Jul Aug Sep Oct Nov DeIc Average 1984 22.10 21.51 22.04 20.66 18.50 20.05 19.98 20.03 20.05 20.25 21.89 21.96 20.75 1985 20.57 20.06 19.88 21.83 21.37 21.06 20.21 20.11 20.21 19.88 19.78 19.63 20.38 1986 21.18 21.71 21.83 18.45 16.33 18.68 20.13 20.06 19.90 19.84 21.77 21.04 20.08 1987 21.82 22.06 21.65 20.63 18.87 17.87 19.86 18.08 19.73 20.39 21.04 21.45 20.27 1988 20.95 21.66 21.76 19.19 21.48 19.62 19.85 19.82 18.36 16.98 20.48 20.98 20.09 1989 18.83 18.06 20.97 21.32 20.93 17.29 19.82 20.79 19.94 21.42 20.94 19.17 19.96 1990 21.42 21.54 20.62 16.75 15.31 21.45 21.16 20.67 19.75 20.49 21.50 17.16 19.82 1991 20.10 21,66 21.98 21.45 20.05 19.71 19.58 19.62 19.67 19.96 17.63 17.11 19.88 1992 16.14 18.51 18.40 19.04 16.17 19.83 19.55 19.98 19.60 18.62 19.93 21.85 18.97 1993 20.72 21.92 21.43 20.64 16.65 19.27 19.27 18.76 19.62 19.65 20.38 20.42 19,89 1994 21.84 21.02 19.55 18.16 19,46 19.51 19.28 19.53 19.44 20.07 20.81 20.91 19.96 1995 21.44 21.31 20.61 18.76 16.30 18.46 20.46 19.36 18.64 18.47 21.21 16.07 19.26 1996 20.00 19.55 20.34 20.20 16.867 19.23 18.50 18.42 18.94 19.68 18.16 16.83 18.88 1997 19.32 20.90 20.27 20.09 21.04 19.66 19.99 19.82 18.97 20.83 20.35 21.84 20.26 1998 21.55 20.17 20.46 19.07 17.71 16.20 20.02 19.53 19.69 20.84 21.51 20.98 19.81 1999 21.00 20.69. 16.00 14.35 19.71 20.22 19.71 19.79 19.62 19.46 19.96 18.56 19.09 Slatistlic Jan Feb Mar Apr May Jlun Jlul Aug Sep Oct Nov Dec P.O.R* Mean 20.56 20.77 20.49 19.41 18,53 19.24 19.84 19.65 19.51 19.80 20.46 19.75 19.83 Stand.Dev 1.49 1.20 1.56 1.92 2.11 1.35 0.58 0.73 0.52 1.07 1.20 2.01 0.53 Minimum 16.14 18.06 16.00 14.35 15.31 16.20 18.50 18,08 18.36 16.98 17.63 16.07 18.88 Median 20.97 21.16 20.62 19.64 18.68 19.56 19.86 19.80 19.65 19.92 20,64 20.66 19.93 Maximum 22.10 22.06 22.0(14 21.83 21.48 21.45 21.16 20.79 20.21 21.42 21.89 21.96 20.75 *; indicates period of records for Stiliorn nd c:xcliudes parlial year results *:: indicates parlil a year -': indicates no data available or large gaps ofl missing data

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Table H3. Monthly and annual average headwater stage at G-78 (ft, NGVD) Month Year Year Jan Feb Mar Apr May Jin Jul Aug Sep Oct Nov Dec Average 1986 21.20 20.96 20.65 19.35 22.06 22.18 21.27 21.37 21.19 20.81 22.70 21.99 21.31 1987 22.80 22.85 22.47 21.92 20.67 21.97 21.91 20.04 21.32 21.20 22.46 22.71 21.86 1988 23.09 23.05 22.68 20.32 22.25 20.84 21.59 21.88 20.43 18.83 21.82 21.88 21,56 1989 20.74 19.32 21.69 22.06 --------** Statistle Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec P.O.R* Mcan 21.96 21,55 21.87 20.91 21.66 21.66 21.59 21.10 20,98 20.28 22.33 2219 21.58 Stand.Dev 1.16 1.76 0.92 1.31 0.86 0.72 11.32 0.95 0.48 1.27 0.46 0.45 011.27 Minimumi 20.74 19.32 20.65 19.35 20.67 20.84 21.27 20.04 20.43 18.83 21.2 21.82 21.88 231 Median 22.00 21.91 22,08 21.12 22.06 21.97 21.59 21,37 21.19 20.81 22.46 21.99 21,56 Maximm 23.09 23.05 22.68 22.06 22.25 22.18 21.91 21.88 21.32 21.20 22,70 22.71 21.86 *: indic. es period of records for station and excludes partial year results **: indicates partial year --': indicates no data available or Iarge gaps of missing data Table H4. Monthly and annual average headwater stage at G-79 (ft, NGVD) Month Year Year Jan Feb Mar Apr Mav Jun Jul Aug Sei Oct Nov Dec Average 1987 22.19 22.47 22.01 21.87 20.67 21.69 21.55 20.35 21.17 20.82 22.04 22.23 21.59 1988 22.57 22.44 22.17 20.31 21.91 20.56 21.06 21.23 20.21 19.74 21.91 21.45 21.301 1989 19.52 19.74 21.23 21.38 20.20 17.30 19.65 21.22 21.07 21.75 21.40 21.29 20.48 1990 21.50 21.49 19.91 18.38 18.84 21.11 20.41 20.09 19.99 22.00 21.74 20.65 20.51 1991 21.61 22.37 22.49 22.57 21.63 21.96 21.40 20.50 20.00 20.45 21.24 20.97 21.43 1992 20.54 20.52 20.82 20.40 19.10 21.60 21.07 20.89 20.79 20.97 21.38 22,02 20.84 1993 22.28 21.72 22.51 21.32 18.58 21.24 21.26 20.97 21.32 21.56 21.16 21.15 21.26 1994 21.49 21.63 21.16 21.18 21.67 21.75 20.59 20.70 20.62 20.56 20.81 21.02 21.10 1995 21,17 21.51 22.18 20.76 20.87 21.29 21.36 21.22 19.70 20.57 20.55 19.29 20.87 1996 20.21 19.67 20.72 20.75 19.77 20.88 19.91 20.21 20.29 20.66 20.32 19.63 20.25 1997 20.04 20.50 20.17 20.00 20.42 20.98 21.62 21.56 19.92 20.58 21.55 22.27 20.80 1998 22.09 20.79 21.12 19.78 19.16 19.41 20.35 20.71 20.33 20.60 20.80 20.56 20.48 Statistic Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec P.O.R* Mcin 21.27 21,24 21,37 20.73 20.24 20.81 20.85 20.81 20.45 20.85 21,24 21.04 20,91 Slund.Dcv 0,98 0.99 0.89 1.08 1.16 1.30 0.65 0.46 0.54 0.63 0.54 0.93 0.43 Minimum 19.52 19.67 19.91 18.38 18.58 17:30 19.65 20.09 19.70 19.74 20.32 19.29 20.25 Median 21.50 21.50 21.20 20,75 20.31 21.17 21.07 20.80 20.31 20.63 21.31 21.08 20.86 Maximum 22.57 22.47 22.51 22.57 21.91 21.96 21.62 21.56 21.32 22.00 22.04 22.27 21.59 *: indicitlcs period of records for station and excludes partial year results ": indicates partial year --': indicates no data available ot large gaps of missing data

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Table H5. Monl.hly and annual average tailwater stage at G-79 (ft, NGVD) Month Year Year ,lan lFeb Mar Apr May .Jun Jul Aug Sep O.c Nov Dec Averau 1995 ----. --17.51 19.83 16.69 ** 1996 19.43 19.27 20.34 20.06 17.78 19.45 18.79 19.66 20.05 19.29 20.06 19.12 19.44 1997 19.73 20.45 19.86 19.60 20.31 19.51 19.51 18.62 18.02 20.24 20.30 20.34 19,71 1998 20.49 19.34 19.60 18.94 18.60 186.61 19.44 19.21 19.22 20.36 20.56 20.57 19.58 Salistlic .Ian leb Mar Apr May Jun .lul AuM Sep Oct Nov Dec P.O.R* Mean 19.88 19.69 19.93 1953 18.90 19.19 19.25 19.16 19.10 19,35 20.19 19.18 19.58 Stand.Dev 0.55 0.66 0.37 0.56 1.29 0.51 0.40 0,52 1.02 1.32 0.31 1.78 0.13 Mirlimilm 19.43 19.27 19.60 18.94 17,78 18.61 18.79 18.62 18.02 17.51 19.83 16.69 19.44 Median 19.73 19.34 19.86 19.60 18.60 19.45 19.44 19.21 19.22 19.77 20.18 19.73 19.58 Maximnumr 20.49 20.45 20.34 20.06 20.31 19.51 19.51 19.66 20.05 20.36 20.56 20.57 19.71 *: indicates period of records for station and excludes partial year resulls ": indicates parlial year --': indicatcs no data available or large gaps of missing data Table H6. Monthly and annual average headwater stage at G--81 (ft, NGVD) Mont.b Year Year IJan F:b Mar Apr May Jun Jl Au Sep Oct Nov Dec Averaue 1996 19.73 19,28 20.02 19.93 16.78 19.07 18.35 18.33 18.72 19.41 18.26 16.88 18.73 1997 19.20 20.69 20.04 19.88 20.90 19.52 19.81 19.56 18.68 20.53 20.06 21.54 20.03 1998 21.26 19.86 20.14 18.77 17.43 15.97 19.77 19.27 20.18 ---** Sl.atistlic Jan Feb Mar Apr May .lun .lul Au S ep Oct. Nov Dec .O.It* Mcan 211.06 19.94 2007 19.53 18.37 18.19 19.31 19.05 19.19 19.97 19.16 19.21 19.38 Stand.Dev 1.07 0.70 0.06 0.66 2.21 1.94 0,83 0.64 0.85 0.79 1.27 3.29 0.92 Minimumrn 19.20 19.28 20.02 18.77 16.78 15.97 18.35 18.33 18.68 19.41 18.26 16.88 18.73 Median 19.73 19.86 20.04 19.88 17.43 19.07 19.77 19.27 18.72 19.97 19.16 19.21 19.38 Maxinlurn 21.26 20.69 20.14 19.93 20.90 19.52 19.81 19.56 20.18 20.53 20.06 21.54 20.03 *: indicates period of records for station and excludes partial year results **; indicates parnial year --: indicates rnu dala available or large gaps of missing data

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Table H7, Monthly and annual average tailwater stage al. G-81 (ft, NGVD) Month Year Year .Ian I'eb Mar Ar May Jun Jul Aug Sep Oct Nov Dec Average 1996 19.13 18,94 20.01 19.73 17.46 19.12 18.47 19.35 19.35 19.01 19.79 18.81 19.10 1997 19.41 20.10 19.63 19.36 20.05 19.24 19.25 18.38 17.73 19.91 20.01 20.05 19.43 1998 20.20 19.09 19.34 18.70 18.41 18.39 19.20 18.92 19,67 ---** Stlatistic Jan Feb Mar Apr May Jun Jul Aug Sep Oct. Nov Dec P.O.R* Mean 19.58 19.38 19.66 19.26 18.64 18.92 18.97 18.89 18.91 19.46 19.90 19.43 19.26 Stand.Dev 0.56 0.63 0.33 0.52 1.31 0.46 0.43 0.49 1.04 0.63 0.15 0.8R 0.23 Minimum 19.13 18,94 19.34 18.70 17.46 18.39 18.47 18.38 17.73 19.01 19.79 18.81 19.10 Median 19.41 19.09 19.63 19.36 18.41 19.12 1[9.20 18.92 19.35 19.46 19.90 19.43 19.26 Maximum 20.20 20.10 20.01 19,73 20.05 1924 19.25 19,35 19.67 19.91 20.01 20.05 19.43 *: indicates period t1 reT:onrt.s r stlation and L cxc:lmles partial year resulls **: indicatecs partial year --': indicates no data availalle tr large gaps of missing data Table H8. Monthly and annual average tailwater stage at S-49 (ft, NGVD) Month Year Year .Ian Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Average 1994 -.... -0.45 0.09 0.44 1.02 1.41 1.43 1.54 ** 1995 0.69 0.27 0.87 0.76 0.69 0.54 0.51 1.49 1.74 1.98 1.19 0.90 0.97 1996 0.67 0.29 0.37 0.40 0.44 0.50 0.46 0.50 0.82 1.45 1.35 0.77 0.67 1997 0.56 0.63 0.51 0.85 0.68 0.90 0.73 0.97 1.12 1.11 0.72 0.41 0.77 1998 0.50 1.00 0.79 0.41 0.50 0.21 0.06 0.59 0.75 0.89 0.81 0.56 0.59 1999 0.57 0.80 0.55 0.40 0.77 0.63 0.37 0.72 1.56 1.83 1.25 0.84 0.86 Statistic .nll Feb Mar AIpr May .un .1ul Aug Sep Oct Nov Dec I'.O.R* Mean 0.60 0.59 0.62 0.56 0.62 0.54 0.37 0.79 1.17 1.44 1.12 0.84 0.77 Stand.Dev 0.08 0.32 0.21 0.23 0.14 0.23 0.26 0.40 0.40 0.41 0.29 0.39 0.15 Minimum 0.50 0.27 0.37 0.40 0.44 0.21 0.06 0.44 0.75 0.89 0.72 0.41 0.59 Median 0.57 0.63 0.55 0.41 0.68 0.52 0.41 0.65 1.07 1.43 1.22 0.1 0.77 Maximum 0.69 1.00 0.87 0.85 0.77 0.90 0.73 1,49 1.74 1.98 1.43 1.54 0.97 *: indicates period 1of records for station and excludes parlid year resiults **: indicatcs partial ycar indicates no data available or large gaps of mi.ising data

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Table 119. Monthly and annual average headwater stage at S-49 (ft, NG VD) Mlonth Jan Feb Mar Apr May Jun Jul .ug Sep Oct Nov Dec Year Average Statistic .Jan Fe. Mar Apr May Jun .Jul Aug Sep Oct Nov Dec P.O.R* Mean 19.80 19.80 19.57 18.52 18.24 19.22 19.45 19.31 19.09 19.27 19.99 19.78 19.32 Stanid.Dev 0.90 0.89 1.05 1.60 1.65 0.77 0.44 0.66 0.64 0.87 0.56 0.93 0.37 Minimum 17,02 16.56 15.89 14.40 14,20 16.72 18.34 17.67 16.08 16.14 18.58 16.56 18.57 Median 20.07 19.82 19.71 19.05 18.55 19.25 19.45 19.39 19.28 19.35 20.05 19.95 19.39 Maximumrn 21,05 20.85 20.85 20.82 20.42 20.56 20.70 20.67 19.69 20.63 20.86 21.19 19.91 *: indic al c period of records for stal.ion and cxcl udes partial year rsul ts **: indicates partial year indicates no dala avilable or large gaps of missin'ig data Year --~-19.48 19.78 19,45 19.51 19.30 19.13 20.33 19.68 19.66 19.65 19.73 19.85 20.13 19.41 20.56 20.41 20.28 20.50 17.02 17.86 20.54 20.68 21.05 20.85 19.72 18.00 20.37 19.66 19.41 19.46 20.19 20.04 20.07 20.73 19.60 19.59 20.24 20.32 18.31 20.17 18.64 20.56 19.73 20.85 20.12 19.56 19.41 20.10 19.68 20.60 20.78 20.33 20.81 17.56 16.56 20.54 20.70 19.12 20.35 18.43 19.04 20.05 20.57 20.82 19.88 20.47 20.55 19.34 19.18 19.67 20.37 20.40 19.22 20.74 19.40 19.14 19.47 ---17.85 18.82 17.90 18.11 19.35 19.09 19.07 19.67 19.11 19.73 19.25 19.43 19.26 19.72 18,59 16.76 18.44 19.84 19.70 19.47 19.29 19.52 19.69 19.48 19.40 19.48 16.57 14.20 18.12 19.60 19.64 20.07 15.41 18.68 19.13 19.00 19.13 20.59 20.26 19.70 19.74 19.31 19.03 20.43 18.60 15.86 19.70 19.46 19.38 19.93 17.03 17.28 20.00 19.63 19.48 18.65 19.49 20.36 19.73 19.66 19.54 20.24 19.63 19.43 20.20 19.70 19.84 16.42 17.93 17.11 19.79 19.50 19.54 20.02 16.89 19.15 19.53 19.34 19.23 19.63 19.15 19.57 19.47 18.77 18.59 19.42 17:16 18.16 20.56 20.70 20.67 20.32 19.27 20.11 19.90 19.45 19.37 19.42 16.87 19.62 19.73 19.96 20.48 19.73 20.13 18.55 18.66 19.87 19.30 18.04 15,87 16.88 19.13 19.14 20.45 20.53 20.22 19.70 19.18 19.37 19.34 19.43 20.03 17.37 19.75 18.63 19.71 20.79 19.73 17.95 19.21 19.46 19.57 18.99 20.82 19.23 19.25 19.58 19.44 20.25 18.18 17.29 19.07 19.57 19.47 19.70 18.99 16.25 16.72 19.49 18.14 20.71 17.31 20.42 19.23 19.44 19.48 19.66 19.83 20,04 17.01 19.98 20.26 18.50 15.07 15.39 19.98 20.32 20.04 20.85 20.14 19.07 19.42 19.16 19.46 18.97 17.96 14.92 18.52 19.40 19.74 20.05 19.73 15.87 19.70 19.36 18.37 20.41 19.66 19.15 19.16 19.29 19.14 20.43 18.88 17.45 18.65 19.70 17.67 20.20 19.87 17.59 19.13 18.34 18.94 19.78 19.50 20.22 19.39 19.38 18.45 19.49 18.88 18.53 18.53 19.34 19.12 15.89 14.40 19.56 19.14 18.76 18.60 19.16 19.42 19.14 19.49 19.69 19.35 19.49 19.25 18.98 19.50 19.49 19.21 18.37 19.05 19.14 19.39 19.51 19.60 19.31 20.31 19.38 19.20 19.54 19.08 19.28 19.12 18.65 18.96 19.45 19.12 19.48 19.59 19.07 19.15 19.64 19.58 19.25 20.20 19.34 20.15 19.24 19.78 19.40 19.30 19.32 19.47 19.52 18.40 18.92 20.10 18.23 16.14 19.24 20.63 19.31 19.66 19.30 19.27 19.29 18.13 19.32 19.36 18.84 19.14 16.08 16.77 18.83 19.34 17.91 20.15 19.06 20.26 19.15 18.45

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T'able H10. Monthly and annual average headwater stage at S-50 (ft. NGVD) Year 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 Monthl Jan Feb Mar Apr May Jun Jul Aug Sep Oct. Nov Dec Year Average Statistic Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec P.O.R* Mein 12.19 12.21 12.26 11.99 12.01 12.45 12.67 12.79 12.77 12.64 12.33 12.14 12.36 Stand,Dev 0.30 0.35 0.40 0.36 0.38 0.57 0.41 041 0.38 0.51 0.36 0.25 0.21 Minimum 11.55 11.53 11.62 11.33 11.26 10.77 11.85 12.01 12.00 11.59 11.78 J1.81 11.96 Median 12.11 12.11 12.15 12,10 12.02 12.45 12.62 12.80 12.72 12.65 12.19 12.09 12.35 Maximum 12.97 13.27 13.34 12.72 12.91 13.70 13.61 13.55 13.66 13.85 13.32 12.90 12.75 *: indicates period of records **: indicates partial year for station and excl udes partial year reSults --': indicultes no daa availabic or large gaps of missing data

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Table H11. Monthly and annual average headwater stage at S-99 (ft. NGVD) Montlh .lan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 19.22 20.25 20.04 19.90 19.84 19.78 19.87 18.82 17.61 19.25 20.06 19.98 19.93 19.91 19.37 20.03 19.99 19.61 19.80 19.87 19.79 16.89 14.88 18.47 19.97 19.98 20.17 20.01 16.14 19.56 19.62 19.84 20.00 19.98 20.00 20.05 20.99 19.96 20.14 19.77 18.81 19.78 20.37 17,97 20.20 20.08 19.78 19.92 19.97 18.04 18.02 20.61 20.07 20.06 20.04 20.14 20.31 20.92 20.19 19.88 19.62 20.25 20.20 20.31 19,92 21.56 21.22 20.37 20.03 20.27 18.13 17.88 20.49 19.90 20.12 20.39 20.17 Year Average Statistic Jan Feb Mar Apr May Jun .lul Aug Sep Oct Nov Dec P.(.R* Mean 20.64 20.79 20.43 19.18 18.,91 19.77 20.02 19.89 19.72 19.96 20.60 20.30 19.98 Slandl.Dov 1.09 1.07 1.20 1.75 1.77 1.06 0.53 0.71 0.51 0.93 0.95 1.49 0.49 Minimum 16.24 18.17 16.02 14.35 14.88 16.21 18.91 18.13 18.37 17.00 17.73 16.15 19.01 Mcdian 20.87 20.79 20.56 19.15 19.45 19.95 19.96 19.84 19.84 19.99 20.58 20.78 20.01 Maximum 22.21 22.26 22.09 21.96 21.55 21.56 21.24 21.68 20.39 22.05 22.19 22.02 20.87 : indicates period of recorls lbr station and excludes partial year resullts **: imlicales partial year --' indicates no data available or large gaps of missing data Year 20.87 20.11 19.95 19.81 19.69 20.00 21.29 20.79 20.98 21.00 20.89 20.79 19.75 20.14 21.36 21.84 21.63 21.75 21.16 19.90 20.20 20.11 20.46 19.31 19.95 19.98 20.19 22.15 21.14 20.14 20.53 22.06 20.58 22.00 20.87 22.09 -20.34 22.21 21.59 20.66 20.16 21.28 21.82 22.01 22.26 21.04 21.73 18.92 18.17 21.49 21.61 20.11 21.76 16.24 18.60 20.71 22.01 21.91 21.03 21.62 21.47 19.90 19.46 19.45 21.05 21.55 20.09 21.03 20.72 19.75 19.74 19.08 19.19 19.70 18.90 19.61 20.11 19.88 19.83 19.91 19.93 20.38 21.73 20.24 22.05 19.99 20.55 20.12 20.32 20.11 19.97 20.06 19.98 19.82 20.42 18.37 17.00 20.03 21.50 19.80 20.42 19.76 20.01 19.67 18.73 19.68 19.66 19.50 20.17 18.38 17.89 19.13 19.65 18.63 20.84 19.56 20.86 19.55 18.92 18.28 19.46 20.47 19.80 19.80 18.83 19.80 19.76 18.91 18.73 17.25 18.05 20.66 20.68 20.86 17.69 20.14 20.78 19.96 19.72 17.54 20.37 20.37 21.13 21.59 21.96 19.44 18.95 20.97 19.76 17.27 17.97 20.54 19.87 21.68 21.27 20.52 19.94 19.96 19.99 20.50 18.81 20.21 20.03 20.10 20.76 18.61 20.12 20.04 20.11 21.90 21.47 21.18 20.28 20.17 18.50 16.38 18.74 20.28 20.18 20.83 19.07 17.72 19.85 18.13 19.27 21.55 19.66 19.88 19.85 21.40 21.06 17.90 19.96 20.89 16.85 15.40 21.53 21.24 20.70 21.48 20.13 19.80 19.54 19.69 19,09 16.26 19.64 19.58 19.98 20.69 16.73 19.36 19.37 18.83 18.14 19.45 19.57 19.44 19.61 18.89 16.44 18.62 20.51 18.84 20.71 17.22 19.82 19.00 18.96 20.19 21.24 19.74 19.87 19.20 19.08 17.63 16.21 20.02 19.49 14.35 19.73 20.11 19.66 19.68

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Table H12. Monthly and annual average tailwater stage at S-99 (ft, NGVD) Yrnr 1964 1965 1966 1967 1968 1969 19701 1971 1972 1973 J1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 J985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 Month Jan Feb Mar Apr May .Jun Jill Augi Sep Oct. Nov Dec Year Average Statistie Jun Feb Mar Apr May Jun Jul Aug Sep Oc. Nov Dec P.O.R* Mcan 12.21 12.24 12.31 12.01 12.05 12.53 12.74 12.91 12.92 12.78 12.38 12.16 12.43 Stand,Dev 0.35 0.41 0.48 0.37 0.42 0.65 0,48 0.49 0.53 0.64 0.42 0.27 0.24 Minimum 11.52 11.51 11.6J. 11.31 11.22 10.81 11.87 12.04 12.05 11.61 11.80 11.77 11.99 Median 12.10 12.15 12.17 12.08 12.13 12.48 12.70 12.94 12.77 12.71 12.24 12.12 12.39 Maximum 13.19 13.60 13.97 12.77 13.15 14.15 13.96 14.07 14.30 14.58 13.53 13.01 12.85 *: irulicates period of records tor stati n arid excludes partial ycar results **: indicates partial year --': indicnis no data available or large gap.s oft missilng cldta