Jennifer Gihring January 25, 2016 Water Resource Assessment: - PowerPoint PPT Presentation

Jennifer Gihring January 25, 2016

Water Resource Assessment: Status • March 2014: SAC briefed on water resource assessment methods • Feb. 2015: SAC briefed on results of saltwater intrusion/upwelling assessment • April 2015: SAC approved saltwater intrusion/upwelling assessment • Dec. 2015: SAC briefed on revised water resource assessment methods • Today: Potential SAC recommendation

Water Supply Plan Conservation & - Net Projected = Irrigation Demand Demand Efficiency Water Alternative Available Water - Net = From Supplies & Demand Traditional Project Sources Options

Purpose of Water Resource Assessment Informs magnitude of projects and management actions needed to meet future demands and avoid unacceptable water resource impacts. • SAC to consider recommendation on water resource assessment methods • Not requesting SAC recommendation on findings or methods to determine available groundwater • Assume necessary components of the NFSEG are available for use

Water Resource Assessment Components Quantitative Waterbodies with Water Adopted MFLs Resource Constraint Saltwater Intrusion Indicators of Water Reservations Water Resource Wetland Vegetation Constraint Other Priority Waterbodies

Saltwater Intrusion/Upwelling • Statistical analysis of observed data • Groundwater quality is projected to impact the availability of fresh groundwater in the NFRWSP in 2035 in a limited geographic area. • SAC recomm. Chloride Trend In Feb 2015; Wells projected to exceed 250 mg/L no changes by 2035

Water R ter Rese eserva vations tions • Water reservations are based on the needs of fish and wildlife or for public health and safety (373.223(4), F.S.) • One water reservation in the NFRWSP (Prairie Creek/Camps Canal) • May constrain local surface water permitting, but does not represent regional constraint for RWSP • Approach: Qualitative discussion in plan

Wetland Vegetation • Input data: - 2009-2011 land cover maps - Soil maps - 2010 & 2035 surficial aquifer levels • GIS analysis combining vegetation type, soils, and change in the surficial aquifer • Field QA/QC • Output: Map of wetland vegetation w/ sensitive vegetation classified as high, moderate, or low potential for impact

MFLs: Lakes • Calculate 2010 Freeboard: Difference between UFA elevation under 2010 conditions vs. minimum needed to meet MFLs • Calculate UFA drawdown at 5-year increments through 2035 Remaining 2010 Incremental - = Freeboard Freeboard Drawdown

Lake County 2010 Freeboard (ft) MFLs: Banana Putnam 0.5 2010 Bell Putnam 1.5 Freeboard Broward Putnam 1.8 Values Como Putnam 0.5 Dream Pond Putnam 1.5 Georges Putnam 2.0 Gore Flagler 2.9 Grandin Putnam 1.6 Little Como Putnam 1.3 Orio Putnam 0.6 Silver Putnam 0.6 Stella Putnam 1.4 Swan Putnam 2.7 Trone Putnam 1.6 Tuscawilla Alachua 1.0

MFLs: Brooklyn, Geneva, & Cowpen • Qualitative discussion in the plan: - Analyses indicate that adopted MFLs are not met under existing conditions. - Adopted MFLs were developed with methods that are no longer considered applicable to lakes with extremely high range of stage fluctuation. - Re-evaluation of these MFLs is in progress.

MFLs: Lower Santa Fe/Ichetucknee • Lower Santa Fe & Ichetucknee Rivers and Springs - Utilize assessments conducted during development of the MFLs and P/R Strategy (“Recovery” status) - No reassessment for the NFRWSP - Metric: 17 cfs recovery from 2010 conditions at Ft. White gage

Metho Method: Othe d: Other r Priority Priority Waterbodies terbodies • SRWMD MFLs Development Planning List & Green Cove Spring • Method: - Calculate flow relative to no-pumping conditions - Calculate flow relative to projected 2035 water use • Metric: 10% decrease in flow

Method: Other Priority Method: Other Priority Waterbodies terbodies River/Spring County/ Basin Planning List Year Alapaha River Alapaha 2017 PL Upper Suwannee River Upper Suwannee 2016 PL Alapaha River Rise Upper Suwannee 2016 PL Alapaha Rise Upper Suwannee 2016 PL Anderson Upper Suwannee 2016 PL Falmouth Upper Suwannee 2016 PL Green Cove Clay N Holton Creek Rise Upper Suwannee 2016 PL Lime Upper Suwannee 2016 PL Lime Run Sink Upper Suwannee 2016 PL SUW923973 (Stevenson) Upper Suwannee 2016 PL SUW101972 (Unnamed) Upper Suwannee 2016 PL Suwannee Upper Suwannee 2016 PL White Upper Suwannee 2016 PL

Potential SAC Recommendation • Components: • Method for addressing water reservation • Method for sensitive vegetation assessment • Method for assessing status of MFL waterbodies • Method for assessing priority waterbodies