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7/23/2009 <br />Key Quantities (MGD) <br />A. Available Water <br />i. Pat Mayse Lake 2060 Firm Yield 53.2 <br />ii. Lake Crook 2060 Firm Yield 6.5 <br />Total 59.7 <br />B. Amount required for local consumption through 2060 <br />YEAR:2020 2040 2060 <br />AMOUNT: 46.9 51.1 52.5 <br />A. Remaining amounts. <br />YEAR:2020 2040 2060 <br />AMOUNT: 12.8 8.6 7.2 <br />1. Amounts include water required for local consumption, contractual obligations, reserves, <br />and future needs. <br />11 <br />Recommendations <br />June 25, 2009 <br />We recommend that the City Council: <br />1. Offer an interruptible supply. Make water available to the outside entity only <br />when the lake is above elevation 448. Elevation 448 was selected to <br />protect current recreational access to the lake. <br />2. Apply to amend the City's water rights permit to allow a peak day taking of <br />up to three times the annual authorized 55 MGD if the City agrees to sell <br />water to an outside entity. <br />3. If the Council desires to increase the amount of water available the following <br />options could be considered: <br />A. Initiate discussions with existing contract customers to determine if there <br />are mutually beneficial terms under which contracted amounts of water <br />could be modified to reflect a maximum annual volume as well as a peak <br />day use, thus freeing up additional water. For example if all contracts were <br />modified to include a maximum annual volume of 125% of the maximum <br />historical usage, this would free up 15.2 MGD. If added to the uncommitted <br />8.6 million gallons in 2040, this would meet the City of Irving's requirement. <br />12 <br />~ 000106 6 <br />