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THE CITY OF
<br />Chapter 7
<br />Water Service Reliability and Drought Risk Assessment PLEASANTON_.
<br />As presented in Chapter 7 of Zone 7's 2020 UWMP, the DRA assumes 5, 11, 60, 13, and 25 percent Table A
<br />allocations for 2021-2025, respectively. Data for 2021 reflect current projected available supplies, while
<br />the last four years reflect the last four years of the multiple -dry year scenario previously discussed.
<br />Zone 7's supply projections are based on existing facilities and the expected availability of supplies from
<br />various sources given the constraints previously described.
<br />7.2.2 DRA Water Source Reliability
<br />Table 7-7 summarizes Zone 7's available supplies for each year of the DRA. In addition to potable water
<br />supplies from Zone 7, the City is expected to produce 3,500 AFY of groundwater in each year of the drought.
<br />For the DRA, recycled water supplies are assumed to be sufficient to meet recycled water demands.
<br />Table 7-7. Projected Zone 7 Supplies for Drought Risk Assessment
<br />(a) Assumes 5, 11, 60, 13, and 25 percent Table A allocations from 2021 through 2025, respectively. 2021 reflects current projected
<br />available supplies, while 2022 through 2025 reflect the last four years of a multiple -dry year scenario.
<br />(b) Includes Yuba Accord transfers.
<br />(c) Includes carryover and current year's yield.
<br />7.2.3 Total Water Supply and Use Comparison
<br />In Chapter 7 of its 2020 UWMP, Zone 7 has indicated it can meet retailer demands during a five-year
<br />drought beginning in 2021. Therefore, Zone 7 supplies are assumed to equal the City's projected potable
<br />water demands after accounting for the City's GPQ (3,500 AFY). Recycled water demands were estimated
<br />by linearly interpolating between actual 2020 use and projected demands for 2025.
<br />As shown in Table 7-8, during a five-year drought beginning in 2021, the City's supplies are adequate to
<br />meet projected demands through 2025, even without water conservation. However, the City may still
<br />prioritize water conservation under such drought conditions to reduce demand and conserve supply for
<br />potentially future dry years.
<br />WEST YOST 7-12 City of Pleasanton
<br />2020 Urban Water Management Plan
<br />May 2021
<br />Available..
<br />Supply-
<br />SWP Table A(a)
<br />4,000
<br />8,900
<br />48,400
<br />10,500
<br />20,200
<br />SWP Carryover
<br />8,900
<br />10,300
<br />9,600
<br />12,800
<br />9,900
<br />Water Transfers(')
<br />10,000
<br />6,000
<br />5,000
<br />6,000
<br />8,000
<br />Arroyo Valle(`)
<br />700
<br />700
<br />6,900
<br />6,900
<br />2,700
<br />Main Basin
<br />13,200
<br />13,200
<br />11,000
<br />10,000
<br />11,000
<br />Semitropic
<br />9,100
<br />9,100
<br />0
<br />9,100
<br />9,100
<br />Cawelo
<br />I 10,000
<br />10,000 I
<br />0
<br />5,000
<br />1,900
<br />Total I 55,900 I
<br />58,200 I
<br />80,900 I
<br />60,300
<br />62,800
<br />(a) Assumes 5, 11, 60, 13, and 25 percent Table A allocations from 2021 through 2025, respectively. 2021 reflects current projected
<br />available supplies, while 2022 through 2025 reflect the last four years of a multiple -dry year scenario.
<br />(b) Includes Yuba Accord transfers.
<br />(c) Includes carryover and current year's yield.
<br />7.2.3 Total Water Supply and Use Comparison
<br />In Chapter 7 of its 2020 UWMP, Zone 7 has indicated it can meet retailer demands during a five-year
<br />drought beginning in 2021. Therefore, Zone 7 supplies are assumed to equal the City's projected potable
<br />water demands after accounting for the City's GPQ (3,500 AFY). Recycled water demands were estimated
<br />by linearly interpolating between actual 2020 use and projected demands for 2025.
<br />As shown in Table 7-8, during a five-year drought beginning in 2021, the City's supplies are adequate to
<br />meet projected demands through 2025, even without water conservation. However, the City may still
<br />prioritize water conservation under such drought conditions to reduce demand and conserve supply for
<br />potentially future dry years.
<br />WEST YOST 7-12 City of Pleasanton
<br />2020 Urban Water Management Plan
<br />May 2021
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