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Zone 7 Water Agency Executive Summary <br />ES.2.6. Groundwater Storage <br />Zone 7 uses two methods for calculating groundwater storage in the Main Basin: The Groundwater <br />Elevation (GWE) Method and the Hydrologic Inventory (HI) Method. Storage volumes from the two <br />methods are averaged to estimate the total storage of the Main Basin at the end of the water year (see <br />Section 2.4.1 of the Alternative GSP). Section 11, Groundwater Storage presents the storage volume for <br />the 2019 WY and shows an overall increase of 4.2 thousand acre-feet (TAF) between the end of the 2018 <br />WY and the end of the 2019 WY. Operational groundwater storage at the end of 2019 WY was 123.8 <br />TAF, which is about 98% of the estimated historical high operational storage (Figure ES -C). The minimum <br />threshold for groundwater storage is shown as the line between Reserve Storage and Operational <br />Storage in Figure ES -C. There were no undesirable results for groundwater storage in the 2019 WY. <br />Figure ES -C: Operational Storage in Main Basin Management Area <br />250 / <br />200 <br />OPERATIONAL STORAGE (above Historical Lows) <br />Q126 Thousand Acre Feet (TAF) Maximum <br />t 150 <br />a <br />0) <br />ru <br />100 <br />`a <br />m <br />3RESERVE STORAGE <br />C 50 128 Thousand Aep <br />0 <br />me I <br />98% of Operational Storage <br />at End of 2,019 Water Year <br />V Un(D 1-02 OO—N(`')V (f)(D I- Co O ON(`') 'I'Uo CD I- Co <br />�00N— cO 0)0cNc.2 cV 9 21—` cO <br />-1-1-000OCOCO O�� <br />I—I—f-OOOOOOOOoo0o0o0o00O0O00000c-000000000 <br />---- OO_O(OOc— <br />NNNN NNNNNN NNN NNN NNNN <br />ES.3 Project and Management Action Overview <br />Zone 7 is currently implementing a variety of programs to assess, manage, monitor, and protect <br />groundwater supplies. Section 12, Groundwater Supply Sustainability and Section 13, Water Quality <br />Sustainability provide details on the key programs Zone 7 managed and implemented during 2019 WY. <br />ES.3.1. Groundwater Supply Sustainability <br />To achieve sustainable groundwater levels, Zone 7 carefully manages all available water supplies, <br />including imported surface water, local surface water, groundwater, and recycled water. During 2019 <br />WY, Zone 7 imported 30,400 acre-feet (AF) of water to meet potable uses and continued to pursue <br />efforts to strengthen supply reliability of imported water and reduce demand through continued <br />promotion of local conservation efforts. Zone 7 also continued to manage groundwater through <br />Annual Report for the Sustainable March 2020 <br />Groundwater Management Program 2019 WY ES -12 <br />