APPENDIX B NORTHERN EVERGLADES REGIONAL SIMULATION MODEL Appendix B TABLE OF CONTENTS B1.0 NORTHERN EVERGLADES REGIONAL SIMULATION MODEL............................. 1 B1.1 Spatial Representation.................................................................................................... 2 B1.2 Simulation Period............................................................................................................ 5 B1.3 Theoretical Assumptions and Limitations ...................................................................... 5 B1.4 Model Input..................................................................................................................... 6 B1.5 Model Output.................................................................................................................. 7 B1.6 Model Validation............................................................................................................ 7 B1.6.1 South Florida Water Management Model (SFWMM)............................................ 8 B1.6.2 UKISS Model..........................................................................................................8 B1.6.3 Validation Results................................................................................................. 10 B2.0 NERSM APPLICATION..................................................................................................13 B2.1 Modeling Scenarios ...................................................................................................... 13 B2.2 Model Setup.................................................................................................................. 21 B2.2.1 Upper Kissimmee Basin (KUB) Sub-watershed................................................... 21 B2.2.2 Lower Kissimmee Basin (LKB) Sub-watershed................................................... 23 B2.2.3 Lake Istokpoga (LI) Sub-watershed...................................................................... 45 B2.2.4 Fisheating Creek (FEC) Sub-watershed................................................................ 57 B2.2.5 Lake Okeechobee (LOK) Sub-watershed ............................................................. 63 B2.2.6 Lake Okeechobee Operations ............................................................................... 63 B2.2.7 MDS and LOWSM Algorithms............................................................................ 65 B2.3 Sub-watershed Specific Assumptions and Specifications ............................................ 66 B2.3.1 Current Base (2005) Assumptions........................................................................ 66 B2.3.2 Future Base (2015) Assumptions.......................................................................... 72 B3.0 WATER BUDGET COMPONENTS............................................................................... 76 B3.1 Rainfall.......................................................................................................................... 76 B3.2 Evapotranspiration ........................................................................................................ 77 B3.3 Flows............................................................................................................................. 77 B3.3.1 Existing Conditions Flows.................................................................................... 78 B3.3.2 Future Base Condition Flows................................................................................ 79 B4.0 ANNUAL AND SEASONAL SUB-WATERSHEDS WATER BUDGETS .................. 82 B4.1 Annual Sub-watershed Water Budget Components ..................................................... 82 B4.2 Dry Season Sub-watershed Water Budget Components............................................... 82 B4.3 Wet Season Sub-watershed Water Budget Components .............................................. 82 B5.0 QUANTIFICATION OF WATER AVAILABLE IN THE WATERSHED.................... 98 B5.1 Objectives ..................................................................................................................... 98 B5.2 Methodology................................................................................................................. 99 B5.3 Quantification of Divertible Volume.......................................................................... 100 B6.0 SENSITIVITY ANALYSES FOR STORAGE CAPACITY SCENARIOS.................. 103 B6.1 Methodology............................................................................................................... 103 B6.1.1 Alternatives 1 to 4............................................................................................... 103 B6.2 Results......................................................................................................................... 104 B6.2.1 Lake Okeechobee................................................................................................ 105 B6.2.2 Caloosahatchee Estuary...................................................................................... 108 B6.2.3 St Lucie Estuary.................................................................................................. 110 LOWCP Phase II Technical Plan Feb 2008 B-ii Appendix B B6.2.4 Water Supply...................................................................................................... 112 B6.3 Conclusions................................................................................................................. 114 B7.0 REFERENCES ............................................................................................................... 115 LOWCP Phase II Technical Plan Feb 2008 B-iii Appendix B TABLE OF CONTENTS (CONTINUED) List of Tables B-1 Performance measures used to evaluate Current and Future Base Conditions and Alternatives..........................................................................................................................8 B-2 Summary of management measures simulated in NERSM Alternative 1.........................15 B-3 Summary of Management Measures Simulated in NERSM Alternative 2 .......................16 B-4 Summary of Management Measures Simulated in NERSM Alternative 3 .......................17 B-5 Summary of Management Measures Simulated in NERSM Alternative 4 .......................18 B-6 Summary of primary characteristics of Current Base Condition Model ...........................65 B-7 Spillway equations used in NERSM for all modeling scenarios .......................................70 B-8 Summary of primary characteristics of Future Base Condition and alternative plan models................................................................................................................................71 B-9 Average Monthly and annual rainfall depths (inches) for Lake Okeechobee Sub- watershed (1970 – 2000)....................................................................................................75 B-10 Average annual inflows (ac-ft) from Sub-watersheds to Lake Okeechobee .....................77 B-11 Characteristics of divertible volume events calculated for the period 1970-2005...........102 B-12 Goals and storage capacities for Alternatives 1 through 4 ..............................................103 B-13 Storage capacities (in ac-ft) for Alternatives 2 through 2E by sub-watershed ................104 B-14 Comparison of performance of Scenarios 2 through 2E based on RECOVER Performance Measures.....................................................................................................106 List of Figures B-1 Sub-watersheds modeled in the Northern Everglades Regional Simulation Model............3 B-2 Node-link diagram representation of NERSM ....................................................................4 B-3 Comparison of NERSM and 2X2 Model Outputs ...............................................................9 B-4 Monthly flow variation at S-65 in NERSM and UKISSWIN models for Current Base ...10 B-5 Monthly flow variation at S-65 in NERSM and UKISSWIN models for Future Base .....11 B-6 Chain of Lakes and Control Structures in Upper Kissimmee Basin Sub-watershed.........21 B-7 Node-Link Diagram Representation of Current Base Condition for Lower Kissimmee Basin Sub-watershed in NERSM.......................................................................................23 B-8 Lower Kissimmee Sub-watershed simulation configuration for Alternatives 1 and 3......26 B-9 Lower Kissimmee Sub-watershed simulation configuration for Alternative 2 .................30 B-10 Lower Kissimmee Sub-watershed simulation configuration for Alternative 4 .................34 B-11 Taylor Creek/Nubbin Slough Sub-watershed simulation configuration for Alternatives 1 and 2 ...........................................................................................................37 B-12 Taylor Creek/Nubbin Slough Sub-watershed simulation configuration for Alternative 3...................................................................................................................... 40 B-13 Taylor Creek/Nubbin Slough Sub-watershed simulation configuration for Alternative 4.......................................................................................................................43 B-14 Istokpoga Sub-watershed simulation configuration for Alternative 1...............................46 B-15 Istokpoga Sub-watershed simulation configuration for Alternative 2...............................49 B-16 Istokpoga Sub-watershed simulation