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THE CITY OF
<br />Chapter 7
<br />Water Service Reliability and Drought Risk Assessment PLEASANTON.
<br />SWP -Table 0)
<br />SWP - Carryover(`)
<br />Water Transfers (d)
<br />Arroyo Valle
<br />Sites Reservoir (e)
<br />BARDP and/or
<br />Potable Reuse(f)
<br />From Storage
<br />Main Basin(g)
<br />Semitropic(h)
<br />Cawelo(h)
<br />Chain of Lakes(')
<br />Table 7-3. Zone 7's Water Supply Volume Available (a)
<br />43,500
<br />4,000
<br />16,900
<br />8,100
<br />54,000
<br />10,500
<br />16,100
<br />10,000
<br />15,500
<br />15,500
<br />2,800
<br />1,800
<br />1,800
<br />1,800
<br />5,000
<br />5,000
<br />5,000
<br />5,000
<br />5,000
<br />5,000
<br />5,000
<br />5,500
<br />0
<br />1,700
<br />1,500
<br />1,500
<br />1,500
<br />1,500
<br />10,000
<br />15,300
<br />16,800
<br />17,700
<br />16,300
<br />15,900
<br />15,800
<br />5,000
<br />29,200
<br />13,000
<br />9,700
<br />10,100
<br />Total 141,000
<br />Percent of Normal 100%
<br />5,000 5,000 5,000 5,000 5,000 5,000
<br />27,600
<br />27,600
<br />25,100
<br />20,600
<br />15,100
<br />9,700
<br />6,500
<br />10,000
<br />10,000
<br />10,000
<br />10,100
<br />10,100
<br />7,100
<br />9,700
<br />9,700
<br />9,700
<br />9,700
<br />9,700
<br />8,300
<br />8,800
<br />7,900
<br />6,900
<br />6,000
<br />5,200
<br />94,300
<br />117,000
<br />92,800
<br />130,800
<br />80,600
<br />79,900
<br />66.9%
<br />83.0%
<br />65.8%
<br />92.8%
<br />57.2%
<br />56.7%
<br />Source: Zone 7 2020 UWMP,
<br />Table 7-1 through Table 7-9
<br />(a) Yields are shown in AFY.
<br />(b) Based on 2040 future SWP reliability Table A allocations.
<br />(c) Zone 7's operational target is typically 10,000 AF for normal years.
<br />(d) Zone 7 is pursuing water transfer agreements for the period through 2030. Amounts may vary from year-to-year, but variability has not
<br />been quantified.
<br />(e) Supplies from Sites Reservoir are assumed to be available by 2030.
<br />(f) Supplies from these sources are assumed to be available by 2030.
<br />(g) These are estimated available supplies, not necessarily what would be pumped. Zone 7's typical operational target is around 9,200 AF
<br />for normal years.
<br />(h) Semitropic and Cawelo available supplies are typically not used during normal years.
<br />(i) The Chain of Lakes Pipeline, which provides access to water stored in the Chain of Lakes, is assumed to be completed around 2025.
<br />Water stored in the Chain of Lakes is assumed to be available by 2030 and would not be used during normal years.
<br />7.1.3 Water Service Reliability
<br />This section presents comparisons of projected water supplies and demands from 2025 through 2045
<br />under the following hydrologic conditions: normal year, single dry year, and five consecutive dry years.
<br />The City's projected demands are presented in Chapter 4, while supply sources are described in Chapter 6.
<br />Unless otherwise noted, it is assumed demand projections will not change with hydrologic conditions. In
<br />other words, demands are assumed to be unconstrained unless they are limited by available supplies.
<br />7.1.3.1 Water Service Reliability -Normal Year
<br />The City's normal year supplies include:
<br />• Purchased supplies from Zone 7
<br />• 3,500 AFY of groundwater pumped by the City from the Main Basin
<br />• Between 1,500 and 1,800 AFY of recycled water
<br />WEST YOST 7-8 City of Pleasanton
<br />2020 Urban Water Management Plan
<br />N-680-60-20-04-WP-R-680-2020UWMP May 2021
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