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<br />Lake Powell (Colorado River) <br /> <br /> <br />" <br />.'c-. <br />~, '/-. <br />" <br />Downstream .....\e..... 01 Glen Canyon Oem aOd Powefplant. <br /> <br />Water Year 1981 <br />Ouringwaler yea< 191>1, Lai<e Powell, which is <br />impounded by Glen Canyon Dam. was <br />operated as part of the Colorado River <br />Storage Project in accordance with governing <br />contracts and laws to provide river regulation, <br />optimum power production, recreation, and <br />fish and wildlife enhancement. <br /> <br />On September 30, 1980, the Lake Powell <br />water surface elevation was 3,688 feel with <br />an active stmage ot 23,01>3,000 acre.feet. The <br />April-July 191>1 runoff above Lake Powell was <br />approximately 41 percent of the long-term <br />average. The waler surface elevation was <br />drawn down to 3.677 feet prior to the spring <br />runoff, and attained a max.imum seasonal <br />level of 3.681 feet by July 1981, Total releases <br />from Lake Powell amounted to 8.295,000 <br />acre.1eet. <br /> <br />14 <br /> <br />Water Year 1982 <br />By the end of September 1981. the eievatlon <br />of Lake Powell was 3,672 feet with a content <br />of 20,751 ,000 acre-feet. Under average runoff <br />conditions the elevaion is expected 10 be <br />drawn down to about 3.662 feet by the spring <br />of 19B2, and reach a maximum elevation of <br />3,684 feet by the end of July, At this elevation, <br />the content is 22,4 million acre-feet. 90 <br />percent of active capacity, and the surface <br />area is approximately 149,500 acres, <br /> <br />Assuming average inflow conditions and <br />minimum releases from Lake Powell, the <br />storage in Lake Powell will remain less than <br />the storage in Lake Mead throughout water <br />year 1982, Therefore. the proposed operation <br />plan for average inflow is based on a release <br />from Lake Powell of 8,230,000 acre.feet With <br />an upper quartile inflow, releases are <br />projected to total 9,300.000 acre-feet. <br /> <br />Lake Powell Active Storage' <br />Reservoir (Acre. Feet) <br /> <br />Maximum Storage <br />Rated Head <br />Minimum Power <br />Surface Area (Full) <br />Reservoir Length <br />(Full) <br />Power Piant <br /> <br />Number of Units <br />Total Capacity <br /> <br />Chart 5 <br /> <br />EI. <br />(Ft.) <br /> <br />25,002,000 3700 <br />9,428,000 3570 <br />4,126,000 3490 <br />161,390 Acres <br /> <br />186 Miles <br /> <br />.doe~ not lnclutle 1,esB,OOO acre-leel 01 dead <br />storage belOW 3370 'eel <br /> <br />8 <br />1,021,000 Kilowatts <br />