Wakulla and Sally Ward Springs Wakulla County, Florida Final
Total Page:16
File Type:pdf, Size:1020Kb
Recommended Minimum Flows for Wakulla and Sally Ward Springs Wakulla County, Florida Final Northwest Florida Water Management District 80 Water Management Drive Havana, Florida 32333 (850) 539-5999 www.nwfwater.com March 2021 Program Development Series 21-XX NORTHWEST FLORIDA WATER MANAGEMENT DISTRICT GOVERNING BOARD George Jerry Roberts Pate Chair Vice Chair Panama City Pensacola Kellie Ted Nick Gus Ralston Everett Patronis Andrews Tallahassee Chipley Panama City DeFuniak Springs Brett J. Cyphers Executive Director DISTRICT OFFICES Havana (Headquarters) DeFuniak Springs Youngstown Milton For Additional Information, write or call: Northwest Florida Water Management District 81 Water Management Drive Havana, Florida 32333 850-539-5999 www.nwfwater.com 2 Table of Contents TABLE OF CONTENTS .................................................................................................................. 3 LIST OF FIGURES ......................................................................................................................... 6 LIST OF TABLES ........................................................................................................................ 10 LIST OF ACRONYMS .................................................................................................................. 12 ACKNOWLEDGEMENTS ............................................................................................................ 13 EXECUTIVE SUMMARY ............................................................................................................. 14 1 INTRODUCTION ........................................................................................................... 20 1.1 OBJECTIVE ................................................................................................................................. 21 1.2 BACKGROUND ............................................................................................................................ 21 1.3 CONCEPTUAL APPROACH ............................................................................................................. 22 1.3.1 Study Area………………………………………………………………………………………………………………….23 1.3.2 Wakulla River Watershed…………………………………………………………………………………………..23 1.3.3 Physiography……………………………………………………………………………………………………………..26 1.3.4 Land Use, Population, and Structural Alterations……………………………………………………….28 1.4 PRECIPITATION ........................................................................................................................... 33 1.5 HYDROGEOLOGY ........................................................................................................................ 36 1.6 WATER QUALITY ........................................................................................................................ 40 1.6.1 Previous Investigations of Wakulla Spring Water Quality…………………………………………..40 1.6.2 Wakulla River Basin Management Action Plan…………………………………………………………..41 1.6.3 Wakulla Spring Water Quality Data Collection…………………………………………………………..42 1.6.4 Trends in Wakulla Spring Nitrate Concentration………………………………………………………..43 1.6.5 Wakulla Spring Water Clarity…………………………………………………………………………………….46 1.6.6 Dissolved Oxygen and Specific Conductance………………………………………………………………49 1.7 BIOLOGY ................................................................................................................................... 53 1.7.1 Vegetation…………………………………………………………………………………………………………………53 1.7.2 Soils……………………………………………………………………………………………………………………………57 1.7.3 Wildlife………………………………………………………………………………………………………………………57 1.7.4 Recreation………………………………………………………………………………………………………………….67 2 HYDROLOGY ................................................................................................................ 69 2.1 HYDROLOGIC SETTING ................................................................................................................. 69 2.1.1 Wakulla Spring………………………………………………………………………………………………………….71 2.1.2 Sally Ward Spring……………………………………………………………………………………………………..71 2.1.3 McBride Slough and Associated Springs…………………………………………………………………….73 2.1.4 Additional Wakulla River Springs………………………………………………………………………………73 2.1.5 Lower St. Marks River……………………………………………………………………………………………….74 2.1.6 Spring Creek Spring Group………………………………………………………………………………………..74 2.2 HYDROLOGIC AND WATER QUALITY DATA COLLECTION .................................................................... 74 2.3 WAKULLA SPRING DISCHARGE MEASUREMENTS AND RECORD GAP FILLING ......................................... 79 2.4 TRENDS IN WAKULLA SPRING DISCHARGE ....................................................................................... 82 2.5 ANALYSIS OF WAKULLA SPRING DISCHARGE INCREASES .................................................................... 84 2.6 WAKULLA RIVER HYDRODYNAMICS ............................................................................................... 86 2.7 FLOWS MEASURED AT USGS STATION 02327022 .......................................................................... 91 2.8 GROUNDWATER WITHDRAWALS ................................................................................................... 92 2.9 MECHANISMS OF WAKULLA SPRING DISCHARGE INCREASE................................................................ 94 2.10 WAKULLA SPRING BASELINE TIME SERIES SELECTION ....................................................................... 97 2.11 TIDAL INFLUENCE ON THE WAKULLA RIVER ..................................................................................... 99 2.12 SALLY WARD SPRING DISCHARGE ................................................................................................ 100 2.13 TRENDS IN SALLY WARD DISCHARGE AND SPRING RUN HYDRODYNAMICS ......................................... 102 2.14 SALLY WARD BASELINE TIME-SERIES SELECTION ............................................................................ 103 3 WATER RESOURCE VALUES ......................................................................................... 104 3.1 RECREATION IN AND ON THE WATER ........................................................................................... 105 3.1.1 Safe Boat Passage………………………………………………………………………………………………….105 3.2 FISH AND WILDLIFE HABITAT AND THE PASSAGE OF FISH ................................................................. 106 3.2.1 Fish Passage…………………………………………………………………………………………………………….106 3.2.2 Manatee Passage and Thermal Refuge……………………………………………………………………107 3.2.3 Instream Woody Habitat Inundation……………………………………………………………………….109 3.2.4 Floodplain Vegetation Inundation……………………………………………………………………………110 3.2.5 Other Fish and Wildlife Habitat Considerations……………………………………………………….110 3.3 ESTUARINE RESOURCES ............................................................................................................. 111 3.3.1 Estuarine Habitats……………………………………………………………………………………………………111 3.4 TRANSFER OF DETRITAL MATERIAL .............................................................................................. 113 3.5 MAINTENANCE OF FRESHWATER STORAGE AND SUPPLY .................................................................. 113 3.6 AESTHETIC AND SCENIC ATTRIBUTES ............................................................................................ 113 3.7 FILTRATION AND ABSORPTION OF NUTRIENTS AND OTHER POLLUTANTS ............................................ 114 3.8 SEDIMENT LOADS ..................................................................................................................... 114 3.9 WATER QUALITY ...................................................................................................................... 115 3.10 NAVIGATION ............................................................................................................................ 115 3.11 SELECTION OF WATER RESOURCE VALUES .................................................................................... 115 4 MODELS USED IN MINIMUM FLOW DETERMINATION ................................................. 116 4.1 HEC-RAS MODEL DEVELOPMENT AND CALIBRATION ..................................................................... 116 4.2 ESTUARINE EFDC MODELING ..................................................................................................... 121 4.2.1 Model Development and Calibration………………………………………………………………………..121 4.3 EFDC MODELING AND MANATEE THERMAL REFUGE EVALUATION (THERMAL MODEL) ....................... 126 4.3.1 Model Development and Calibration………………………………………………………………………..127 4.4 CONSIDERATION OF INSTREAM HABITAT MODELS .......................................................................... 131 5 EVALUATION OF WATER RESOURCE VALUES AND RESULTS ......................................... 132 4 5.1 HEC-RAS MODEL WRV EVALUATION ......................................................................................... 132 5.1.1 WRV1 Recreation In and On the Water…………………………………………………………………….133 5.1.2 WRV2 Fish and Wildlife Habitats and the Passage of Fish……………………………………...136 Fish Passage…………………………………………………………………………………………………………………………136 5.2 ESTUARINE EFDC MODEL WRV EVALUATION ............................................................................... 148 5.3 WATER QUALITY ...................................................................................................................... 150 5.4 EFFECTS OF SEA LEVEL RISE .......................................................................................................