12-Presentation on the Lake Pat Mayse Study Committee recommendations

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HDR-00085438-001 Executive yield available froJn each of these alternatives. The City could potentially develop reliable supplies of up to 85,620 acft/yr (76 MGD) by the development of several of these options. Tab/e ES-5. Summary of Firm Yie/ds of Water Supp/y Alternafives Source Firm Yie/d Existing Water Suppiy Reservoirs 66,960 acft/yr (59.7 MGD) Return Flow Scenario A- Discharge to Crook + 7,200 acft/yr (6.4 MGD) Return Flow Scenario B- Pine Creek Pump Back to Pat Mayse + 10,840 acft/yr (9.7 MGD) Raise Lake Crook 2 Feet + 1,290 acfUyr (1.2 MGD) Pat Mayse Lake Storage Reallocation + 6,530 acft/yr (5.8 MGD) Total Potential Firm Supply (with Return Flow Scenario A) (with Return Flow Scenario B) 81,980 acfUyr (73.1 MGD) 85,620 acft/yr (76.4 MGD) Table ES-6 summarizes potential interruptible supply available with over/underdrafting operations. Interruptible supplies could add, on average, anywhere from 2,300 to 8,600 acft/yr if a customer was identitied that could take the extra water when it is available (about 30 percent of the time) and then reduce their water use between 900 and 1,970 acft/yr during the other 70 percent of the time. Tab/e ES-6. Summary of Inferruptib/e Wafer Supp/y Available Average Interruptib/e Amounts Reduced Firm Yield Amounts 115% Over/Underdrafting + 2,970 acft/yr - 920 acft/yr 130% Over/Underdrafting + 5,651 acft/yr - 1,470 acft/yr 150% Over/Underdrafting + 8,659 acft/yr - 1,970 acfdyr 115% Over/Underdrafting with Reallocation + 2,338 acft/yr - 1,200 acft/yr 130% Over/Underdrafting with Reallocation + 5,080 acft/yr - 1,200 acft/yr 150% Over/Underdrafting with Reallocation + 7,812 acft/yr - 1,200 acfUyr Citj+ of Paris - Put Mayse Lake Study ES-8 Jai:uury 2009 - Draft C;