The St. Johns River Water Supply Impact Study
The District held a technical meeting on March 30 for the public to learn about the study and the results, and to discuss the details and methodologies with District scientists and engineers. The presentations at the links below are summaries of the study and are not intended to substitute for any components of the full report.
The St. Johns River Water Supply Impact Study — the most comprehensive and scientifically rigorous analysis of the St. Johns River ever conducted — was completed and presented to the St. Johns River Water Management District’s Governing Board on Feb. 14, 2012.
The four-year study resulted in the development of tools that will help guide future decision-making on the potential environmental effects of proposed water withdrawals from the St. Johns and Ocklawaha rivers on the St. Johns River system. The state-of-the-art models and methodologies that resulted from the study will be used in consumptive use permitting, minimum flows and levels development, regional water projects and water supply planning.
As part of the WSIS, scientists collected environmental data from the St. Johns River, including this work at Lake Monroe to collect data on plankton.
The tools developed will be applied during the review process for any future river withdrawal permit applications. The amount of water that may ultimately be withdrawn will depend on the proposed location, design and timing of proposed withdrawals, as well as the numerous permitting criteria considered when permit applications are submitted.
The tools also can be used by the District, local governments, other agencies, and potentially with other river systems.
The study confirms the findings of earlier investigations indicating that the St. Johns River can be used as an alternative water supply source without causing significant harm to the environment. The study does not authorize river water withdrawals.
More than 70 scientists and engineers – a combination of District staff and outside experts – have been involved in the study that began in December 2007. Experts analyzed a range of water withdrawal scenarios that are representative of potential future water withdrawals. Thousands of different combinations were evaluated.
Among results of the WSIS are state-of-the-art computer models.
The District also engaged one of the nation’s most highly respected bodies of scientists, the National Academy of Sciences, to conduct an impartial peer review of the project. The National Research Council, the Academies’ operating arm, completed its peer review in December.
The St. Johns and Ocklawaha rivers are being considered for future water supplies because groundwater supplies are limited in many areas of the District. Because the traditional water source — groundwater from the Floridan aquifer — is limited, additional water conservation and alternative water supplies continue to be high priorities. Those alternative water supplies include reclaimed water, brackish groundwater, seawater and surface water such as the Ocklawaha and St. Johns rivers.
Accessing this report
The WSIS is available only as an electronic document, with separate portable document format (PDF) files for each chapter and appendixes. Following is the list of each chapter and the appendixes. To download a file to your computer, right click on the desired link below and choose “Save Target As…” from the resulting pop-up menu. You will be prompted to choose a location on your computer to save the file.
Water Supply Impact Study
- The Report (July 23, 2012)
- Chapter 1. Executive Summary (3.3 MB)
- Chapter 2. Comprehensive Integrated Assessment (2.5 MB)
- Chapter 3. Watershed Hydrology (23.5 MB)
- Appendix 3-A. Land Use Classification/Grouping (0.1 MB)
- Appendix 3-B. HSPF Common Logic for SJRWMD (0.1 MB)
- Appendix 3-C. USJR Post-Processing of Simulated Flows and Stages (0.1 MB)
- Appendix 3-D. Evaluation of Model Uncertainty (0.1 MB)
- Appendix 3-E. Calibration and Simulation for Water Quality: Case Study (0.8 MB)
- Appendix 3-F. Climate Change Evaluation (0.5 MB)
- Appendix 3-G. St. Johns River Watershed Water Supply Impact Study Model Review by Intera (1.1 MB)
- Appendix 3-H. Explanation of Plots and Tables (0.1 MB)
- Appendix 3-I. 06-Upper St. Johns River Calibration (12.6 MB)
- Appendix 3-J. 04-Middle St. Johns River Calibration (12.7 MB)
- Appendix 3-K. 05-Lake George Calibration (1.2 MB)
- Appendix 3-L. 07-Ocklawaha River Calibration (8.4 MB)
- Appendix 3-M. 03-Lower St. Johns River Calibration (14.2 MB)
- Chapter 4. Groundwater Hydrology (5.4 MB)
- Chapter 5. River Hydrodynamics Calibration (23.4 MB)
- Chapter 6. River Hydrodynamics Results (12.0 MB)
- Chapter 7. Biogeochemistry (3.5 MB)
- Appendix 7-A. Synoptic Soil Survey Maps, Data, and Summary (1.8 MB)
- Appendix 7-B. Identification of Methods for Sample Analysis (0.1 MB)
- Appendix 7-C. Wetland Constituent Release Model (0.7 MB)
- Appendix 7-D. Wetland Constituent Reduction Model (0.1 MB)
- Appendix 7-E. Blue Cypress Soil Release Calculations and Model Simulations (0.2 MB)
- References for appendices (0.1 MB)
- Chapter 8. Plankton (3.9 MB)
- Appendix 8-A. Relationships of Water Flows with Plankton and Water Quality (0.2 MB)
- Appendix 8-B. Effect of Water Withdrawal on Phytoplankton Biomass in Lake Poinsett (1.3 MB)
- Appendix 8-C. Empirical Regression Models and Goodness-of-Fit Diagnostics (1.1 MB)
- Appendix 8-D. Ce-Qual-Icm Setup, Calibration and Withdrawal Scenario Results (2.9 MB)
- Appendix 8-E. Nitrogen and Phosphorus Concentrations, Fluxes, and Loads in the St. Johns River (0.1 MB)
- Appendix 8-F. Dominant Phytoplankton Taxa at Lake George and Racy Point and Dinoflagellate Taxa in the Lower St. Johns River (0.1 MB)
- Chapter 9. Submersed Aquatic Vegetation (1.2 MB)
- Appendix 9-A. Submerged Aquatic Vegetation Patterns in the Lower St. Johns River Basin (0.6 MB)
- Appendix 9-B. Submerged Aquatic Vegetation (SAV) in the Lower St. Johns River and the Influences of Water Quality Factors on SAV (0.3 MB)
- Appendix 9-C. Salinity-Induced Enzymatic Stress Response in Vallisneria Americana (0.9 MB)
- Appendix 9-D. Intensive Submerged Aquatic Vegetation Monitoring in the Lower St. Johns River Basin (1.0 MB)
- Appendix 9-E. Response of Vallisneria Americana Following Repeated Exposure to Different Salinity Regimes (2.6 MB)
- Appendix 9-F. Surface Salinity Partial-Duration Frequency Analyses (0.7 MB)
- Appendix 9-G. Potential for Replacement of Vallisneria Americana by Ruppia Maritima (0.6 MB)
- Appendix 9-H. Predicted Changes in Vallisneria Americana Habitat Suitability Indices Using Modeled Salinity and Light Conditions in the Lower St. Johns River, Florida (2.7 MB)
- Chapter 10. Wetland Vegetation (6.5 MB)
- Appendix 10-A. Description of Method for Hist-Delta and Simulated Stages at Ungauged River Transect Locations (0.3 MB)
- Appendix 10-B. Wetland and Soil Types in the Floodplain of the St. Johns River, Florida (0.3 MB)
- Appendix 10-C. Appendix 4 Estimation of Salinity in Ortega River, Florida (0.5 MB)
- Appendix 10-D. Hydroperiod Tool analysis of St. Johns River Segment 7 (6.6 MB)
- Chapter 11. Benthic Macroinvertebrates (2.9 MB)
- Appendix 11-A. Description of Benthic Communities of the St. Johns River (0.1 MB)
- Appendix 11-B. Geographic Coordinates of the Sites Sampled in the 2009 Field Study (0.1 MB)
- Appendix 11-C. Minitab Plots of Metrics Calculated from the Data of the 2009 Field Study (0.2 MB)
- Appendix 11-D. Merritt and Cummins Final Report from 2009 Field Study (2.0 MB)
- Appendix 11-E. GIS Analysis of Changes in Wetlands in Lake Poinsett Where Benthic Sampling Was Conducted in 2009 Field Study (3.2 MB)
- Appendix 11-F. Literature Review of Hydrologic and Habitat Requirements of Crayfish and Apple Snail (0.1 MB)
- Appendix 11-G. Frequency Analysis of Hydrologic and Salinity Changes Due to Withdrawals (1.0 MB)
- Appendix 11-H. Literature Review of Salinity and Freshwater Inflow Effects on Blue Crab and Penaeid Shrimp (0.2 MB)
- Chapter 12. Fish (2.1 MB)
- Appendix 12-A. Fishes of the St. Johns River System (0.2 MB)
- Appendix 12-B. Ichthyoplankton Sampling Methods (0.7 MB)
- Appendix 12-C. Potential Withdrawal Effects on Anadromous Herrings (0.1 MB)
- Appendix 12-D. Potential Withdrawal Effects on the Large Sunfishes Assemblage (0.2 MB)
- Appendix 12-E. Potential Withdrawal Effects on the Littoral Zone, Marsh and Floodplain Small Fishes Assemblage (0.3 MB)
- Appendix 12-F. Summary of Regression Analyses Relating Freshwater Inflow to Distribution, Monthly Abundance, and Annual Abundance Derived from the FIM’s Dataset 2001–2011 (0.3 MB)
- Appendix 12-G. Summary of Predicted Changes in Pseudo-Species Distribution, Monthly Abundance and Annual Abundance for Six Modeled Withdrawal Scenarios Compared to Base1995NN (0.5 MB)
- Appendix 12-H. Potential Effects of Riverine Flow Reduction on the Fisheries Oceanography of the South Atlantic Bight (0.1 MB)
- Chapter 13. Floodplain Wildlife (0.9 MB)
- Appendix 13-A. Wildlife of the St. Johns River Floodplain (0.2 MB)
- Appendix 13-B. Taxonomic Wildlife List (0.2 MB)
- Appendix 13-C. Wildlife Species of Conservation Concern for the St. Johns River Floodplain (0.2 MB)
- Appendix 13-D. Supporting Information and Glossary for the Hydrologic Wildlife Model (0.6 MB)
- Appendix 13-E. Wildlife Species and Their Hydrologic Requirements (0.5 MB)
- Appendix 13-F. Waterfowl Population Summary (0.2 MB)
Posted on 2-14-2012