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WSP10457
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Last modified
1/26/2010 3:13:02 PM
Creation date
10/12/2006 4:20:33 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8282.600.10
Description
Colorado River Operating Annual Reports
Basin
Colorado Mainstem
Date
1/1/1989
Author
USDOI/BOR
Title
Operation of the Colorado River Basin 1989 Projected Operations 1990
Water Supply Pro - Doc Type
Publication
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<br />Water Year 1990 <br /> <br />Lake Powell began water year 1990 at elevation 3665,2 feet <br />with an active content of 19,805,000 acre-feet (79 percent full). <br />The plan of operation through March is to maintain releases <br />at about 33 percent of powerplant capacity. Assuming a most <br />probable unregulated runoff water year of 8,82 maf, <br />cfucharges from the powerplant would be decreased to a daily <br />average of9.200 cfs, or 28 percent of powerplant capacity for <br />April and May, then increased to 33 percent for June, During <br />the months of July through September, the reservoir would be <br />operated with average discharges at about 42 percent of <br />powerplant capacity. Total discharges for the water year <br />would be 8.23 maf, The lowest monthly release in 1990 will be <br />about 500,000 acre-feet and the highest monthly release is <br />projected to be about 900,000 acre-feet. In addition. minimum <br />flow rates will be maintained to serve fishery and recreation <br />needs, <br /> <br />The operation plan for the reasonable maximum inflow and <br />the reasonahle minimum inflow is the same as the most <br />probable due to dry basin conditions and reduced reservoir <br />levels, Total water year releases of 8,23 maf would allow Lake <br />Powell to fill to about 93 percent of full, 78 percent full, and ' <br />72 percent full; for the reasonable maximum, most probable, <br />and reasonable minimum runoffs, respectively, <br /> <br />The actual releases from Lake Powell after January I, 1990, <br />will be reevaluated hased upon runoff forecasts, reflecting <br />current hydrologic conditions. It is expected that powerplant <br />hypasses will be avoided in all three operating scenarios, <br /> <br />LAKE POWELL STORAGE <br /> <br />\DOO,OOO ACRE-fEET <br />.. <br />.. <br /> <br />... <br /> <br /> <br />., <br /> <br />It <br /> <br />20 <br /> <br />11 <br /> <br />11 <br /> <br />t7 <br /> <br />ita N D ~ f M A M ~ ~ A ION D J f W A M ~ J A 8 0 <br />ACT\JAL 1989 AND PROJECTED 1990 <br /> <br />PROJECTED OPERATION 1990 <br />REASONABLE MAXIMUM RELEASES <br /> <br />1000 CFS <br />'0 <br /> <br />.. <br /> <br />.0 <br /> <br />,. <br /> <br />.,1.IIlllIIII.....-.... <br /> <br />-- --- <br /> <br />10 <br /> <br />. <br /> <br />o <br /> <br />MOST PROBABLE FleLEASES <br /> <br />so <br /> <br />.. <br /> <br />10 <br /> <br />t. <br /> <br />.............-~. <br /> <br />---- ...._~ <br /> <br />,. <br /> <br />. <br /> <br />o <br /> <br />REASONABLE MINIMUM RELEASES <br /> <br />.. <br /> <br />.. <br /> <br />ao <br /> <br />t. <br /> <br />............- ~. <br /> <br />--- '-- <br /> <br />,. <br /> <br />. <br /> <br />. <br /> <br />NDJFMAMJJASO <br /> <br />14 <br />
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