12-Presentation on the Lake Pat Mayse Study Committee recommendations

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PAT MAYSE WATER STUDY COMMITTEE Recommendations June 25, 2009 We recommend that the City Council: 1. Offer an interruptible supply. Make water available to the outside entity only when the lake is above elevation 448. Elevation 448 was selected to protect current recreational access to the lake. 2. Apply to amend the City's water rights pennit to a11ow a peak day taking of up to three times the annual authorized 55 MGD if the City agrees to sell water to an outside entity. 3. Tf the Counci] desires to increase the amount of water available the following options could be considered: • Initiate discussions with existing contract customers to determine if there are mutually beneficial terms under which contracted amounts of water could be modified to reflect a maximum annual volume as well as a peak day use, thus freeing up additional water. For example if all contracts were modified to include a maximum annual volume of 125% of the maximum current historical usage, this would free up 15.2 MGD. If added to the uncommitted 8.6 million gallons in 2040, this would meet the City of Irving's requirement. • Recapture the effluent from its wastewater treatment plant, and from Campbell Soup, by constructing the Consultant's suggested diversion structure at Hicks Creek, and diverting this water back to Lake Crook. Operate Lake Crook and Pat Mayse as a system with water from Lake Crook being the first water sold to an outside entity. Use the existing pipelines from Pat Mayse to the water treatment plant to carry additional water supply ftom Pat Mayse to Lake Crook as needed. System operation plus use of return flows would increase firm yield about 12 MGD. • Provide local sponsorship, possibly in conjunction with other interested entities for a Corps of Engineers study to determine the viability of reallocation of Pat Mayse flood control storage to water supply storage. • Pursue the Consultant's return flow Scenario B by constructing a diversion structure on Pine Creek near the Red River, catching all return flows froin Pine Creek through that point and selling it to the outside contracting entity. tj