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Section 7 2025 Urban Water Management Plan
<br />Water Supply Reliability Assessment City of Pleasanton
<br /> Public Draft | May 2026
<br /> 7-11 EKI Environment & Water, Inc.
<br />Table 7-3 Zone 7’s Water Supply Volume Available
<br />Water Source(a)
<br />Normal
<br />Year
<br />Single
<br />Dry Year
<br />Multi-Year Drought
<br />Year 1 Year 2 Year 3 Year 4 Year 5
<br />(AF) (AF) (AF) (AF) (AF) (AF) (AF)
<br />SWP – Table A (b) 36,574 1,229 9,303 7,961 32,793 4,897 5,185
<br />SWP – Carryover (c) 10,000 10,000 10,000 8,858 8,864 6,802 0
<br />Water Transfers (d) 0 0 0 0 0 0 0
<br />Arroyo Valle 4,000 4,000 4,000 209 258 60 4,381
<br />Sites Reservoir(e) 2,185 10,511 8,909 12,085 1,834 214 755
<br />From Storage
<br />Main Basin(f) 30,000 30,000 30,000 30,000 30,000 30,000 24,343
<br />Non-Local Storage
<br />Programs(g) 19,741 16,600 16,600 16,600 19,268 16,600 9,448
<br />Chain of Lakes(h) 11,700 11,700 11,700 14,586 13,868 0 0
<br />Total 114,200 84,040 90,512 90,299 106,885 58,573 44,112
<br />Percent of Normal 100% 74% 79% 79% 94% 51% 39%
<br />NOTES:
<br />(a) This table is based on Zone 7’s 2025 UWMP (Section 7.2 and Tables 7-1 to 7-9), where the reliability of each
<br />water supply source is discussed.
<br />(b) Based on DWR’s modeling of SWP availability in the Draft 2025 DCR. Zone 7 applied the hydrologic time series
<br />from the DCR’s 2043 50% level-of-concern to model the reliability of its Table A allocations.
<br />(c) Zone 7’s operational target is typically 10,000 AF for normal years.
<br />(d) Beyond 2035, Zone 7 assumes that zero transfers will be available, and therefore, the values in this table are
<br />zero.
<br />(e) Supplies from Sites Reservoir are assumed to be available by 2035.
<br />(f) These are estimated available supplies, not necessarily what would be pumped. Zone 7’s typical operational
<br />target is around 5,000 AFY for normal years.
<br />(g) Includes available supplies from Semitropic and Cawelo Water Districts, as well as other future supply
<br />programs. Zone 7 does not typically use these available supplies during normal years.
<br />(h) The Chain of Lakes Conveyance System, which provides access to water stored in the Chain of Lakes (COLs),
<br />is assumed to be completed around 2035. During the five-year drought, the operational storage in COLs is
<br />depleted by years four and five.
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