Withlacoochee Regional Water Supply Authority Final Water Supply

Withlacoochee Regional Water Supply Authority Final Water Supply Plan Update July 2014

Presentation Topics § Key Topics of the Water Supply Plan § § Demand Projections Source Evaluation § § § Groundwater Availability Comparison of Sources to Demands Public Input Process Completion Schedule Board Action to Accept the Final Draft

Public Supply Demand Projections (2010 -2035) County 2010 Water Demand (mgd) Increase in Demand from 20102035 (mgd) 2035 Water Demand Citrus 14. 7 5. 3 20. 0 Hernando 22. 1 6. 0 28. 1 Marion 38. 1 16. 9 55. 0 Sumter 20. 1 12. 8 TOTALS 95. 0 41. 0 32. 9 136. 0

Demand Projections for All Use Categories (2010 -2035) Use Category 2010 Water Demand (mgd) Increase in Demand from 20102035 (mgd) 2035 Water Demand (mgd Public Supply 95. 0 41. 0 136. 0 Domestic 31. 0 34. 3 65. 3 Industrial Commercial 17. 7 4. 8 22. 6 Recreational 25. 2 13. 5 38. 7 Agriculture 17. 0 3. 2 20. 2 TOTALS 185. 9 96. 8 282. 8

Water Source Evaluation § The Availability of Water from all Sources by 2035 was Quantified § § § Public Supply Water Conservation Reclaimed Water Groundwater Surface Water Seawater Desalination

Water Source Evaluation Potential Water Supply Availability in 2035 Source Potential Quantity in 2035 (mgd) Public Supply Water Conservation 13. 5 Reclaimed Water 4. 9 Groundwater 76+ Surface Water (Withlacoochee & Ocklawaha Rivers) 65. 6 Seawater Desalination 15. 0 Total 160+

Determining the Availability of Groundwater for Water Supply through 2035 § Groundwater availability was determined through the Use of the SWFWMD’s Northern District Model § The projected 2035 water demands were adjusted to account for the effects of water conservation and use of reclaimed water, then input into the model.

Regional Groundwater Modeling

Regional Groundwater Modeling Predicted Flow Reduction for Major Springs Spring Name Weeki Wachee Springs Chassahowitzka Springs Homosassa Springs Gum Slough Springs Kings Bay Springs Rainbow Springs Silver Glen Springs 2035 Percent Change SWFWMD 6. 5 MFL Allowable Flow Reduction (%) 1. 9 3. 0 2. 9 6. 3 2. 2 2. 6 SJRWMD 7. 0 0. 1 10. 0 3. 0 9. 0 Under Development

Regional Groundwater Modeling Conclusions § SWFWMD – The 2035 demands for all use categories can be met with groundwater from the Upper Floridan aquifer with no exceedences to springs and rivers for which MFLs have been proposed or adopted. Groundwater from the Upper Floridan aquifer will be sufficient to meet demands through 2035 only if demand is reduced by water conservation and aquifer drawdowns are offset by recharge from the use of reclaimed water. The implication of this result is that beyond 2035, the ability of groundwater from the Upper Floridan aquifer to meet demand may be limited in certain areas. – –

Regional Groundwater Modeling Conclusions § SJRWMD – MFLs for Silver Springs/Silver River are currently being developed by the SJRWMD and will likely impact resource availability. An analysis by SJRWMD staff indicates that the current draft MFLs would not be met under 2035 projected demands. The SJRWMD is working on tools to assist in the development of a prevention/recovery strategy. – –

Projected 2035 Demand in the SWFWMD and SJRWMD Portions of the WRWSA SWFWMD – 76 mgd SJRWMD – 21 mgd 97 mgd

Public Input Process § Water Management District/Water Supply Utility Input – § Over 100 technical and editorial comments Public Input – Withlacoochee Area Residents » » » Longer planning horizon Concerns about relying on the Lower Floridan aquifer Expanded cost analysis Eliminating seawater desalination as an option Cross Florida Barge Canal Water Supply Option

Timeline for Completion of the Water Supply Plan § Final Draft Due to the SWFWMD by July 25 th

Staff Recommendation: • Board Acceptance of the Final Report and Approval for Submittal to the SWFWMD