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Page 11 of 19 <br />21418818.2 <br />Coastside CWD’s high variability in SFPUC purchases from year to year, the California Coastal <br />Commission limitations on growth in its service area, and geographical and hydrological <br />isolation set it apart from other Wholesale Customers. Uniquely among the Wholesale <br />Customers, Coastside CWD does not have interties with other Wholesale Customers or <br />agencies. Additionally, it has junior rights on local surface water supplies. To ensure resiliency, <br />Coastside CWD must maximize its use of Denniston Creek in normal years to provide evidence <br />to the State in its ongoing case to perfect its water rights. This results in low RWS purchases in <br />non-drought years, which are the source of each Wholesale Customer’s Base Period. The <br />Coastside CWD special provisions for Base Period SFPUC Purchases ensure its dry year <br />reliance on the RWS is reflected in the Tier 2 Plan. <br />Minimum Cutback Factor <br />The minimum cutback factor is used to establish the upper limit at or below which each <br />Wholesale Customer’s final allocation will be. The minimum cutback factor is equal to 1/3 times <br />the Overall Average Wholesale Customer Reduction, expressed as a percentage. Base Period <br />SFPUC Purchases (up to ISG or proxy) are multiplied by 1 minus the minimum cutback factor. <br />An example equation is provided below. π‘Šπ‘Šβ„Žπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œ πΆπΆπΆπΆπ‘œπ‘œπΆπΆπ‘œπ‘œπΆπΆπ‘œπ‘œπΆπΆ π‘“π‘“π‘“π‘“π‘“π‘“π‘œπ‘œπ‘œπ‘œ π‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘Žπ‘Žπ‘œπ‘œπΆπΆπ‘“π‘“π‘œπ‘œπ‘“π‘“ πΆπΆπ‘’π‘’π‘’π‘’π‘œπ‘œπΆπΆ π‘œπ‘œπ‘“π‘“πΆπΆπ‘“π‘“πΆπΆ = π΅π΅π‘œπ‘œπ‘œπ‘œπ‘œπ‘œ π‘ƒπ‘ƒπ‘œπ‘œπΆπΆπ‘“π‘“π‘œπ‘œπ‘ƒπ‘ƒ 𝑆𝑆𝑆𝑆𝑃𝑃𝑆𝑆𝐢𝐢 π‘ƒπ‘ƒπΆπΆπΆπΆπ‘Žπ‘Žβ„Žπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œ × οΏ½1 βˆ’(1 3 <br />β„× π‘‚π‘‚π‘‚π‘‚π‘œπ‘œπΆπΆπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œ π΄π΄π‘‚π‘‚π‘œπ‘œπΆπΆπ‘œπ‘œπ΄π΄π‘œπ‘œ π‘Šπ‘Šβ„Žπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œ πΆπΆπΆπΆπ‘œπ‘œπΆπΆπ‘œπ‘œπΆπΆπ‘œπ‘œπΆπΆ π‘…π‘…π‘œπ‘œπ‘ƒπ‘ƒπΆπΆπ‘Žπ‘ŽπΆπΆπ‘“π‘“π‘œπ‘œπ‘“π‘“)οΏ½ <br />Step 1 Override Exception <br />If a Wholesale Customer’s allocation in Step 1 (Efficient Residential Allocation) is greater than <br />the upper limit of its potential allocation established by the Minimum Cutback, the Step 1 <br />allocation will override. However, no Wholesale Customer’s final cutback will be less than 5%. <br />For example, in a 20% Overall Average Wholesale Customer Reduction, the Minimum Cutback <br />will be 6.67% (20% × 1/3). An example Wholesale Customer’s calculation is provided below. <br />Base Period SFPUC Purchases 5.0 MGD <br />Minimum Cutback Factor -6.67% <br />Upper Limit of Potential Final Allocation 4.67 MGD <br />Population 101,000 <br />Base Period SFPUC Reliance 100% <br />Residential Efficient Allocation 47 GPCD <br />Step 1 Allocation 4.75 MGD <br />The example agency’s final cutback will be 5.1% as calculated below: 4.75 𝐢𝐢𝐴𝐴𝑃𝑃5.0 πΆπΆπ΄π΄π‘ƒπ‘ƒβˆ’1 =βˆ’5.1%⁄ <br />Maximum Cutback Factor <br />The maximum cutback factor is used to establish the lower limit at or above each Wholesale <br />Customer’s final allocation. The maximum cutback factor is equal to 1.5 times the Overall <br />Average Wholesale Customer Reduction, expressed as a percentage. Base Period SFPUC <br />ATTY/RESO.0092/CC RESO APPROVING TIER 2 DROUGHT RESPONSE IMPLEMENTATION PLAN (WATER SUPPLY AGREEMENT) - EXHIBIT A <br />REV: 08-18-25 MI <br /> <br />Page 13 of 21