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<br />Projected Plan of Operation - Water Year 1988 <br /> <br />A proposed operation plan for water year 1988 for major <br />reservoirs of the Colorado River system was formulated and <br />distributed to representatives of the Colorado River Basin <br />States in November 1987, This plan was prepared in <br />accordance with the Openting Criteria published June 4, <br />1970, in compliance with Section 602, Public Law 90-537. The <br />plan reflects operation for flood contro~ domestic and <br />irrigation use of water, hydroelectric power generation, water <br />quality control, fish and wildlile propagation, recreation, and <br />Colorado River Compact requirements, <br /> <br />During the rust three months of water year 1988, releases will <br />be at 33 percent of powerplant capacity at Glen Canyon, then <br />releases will increase during January 1988 in order to develop <br />sufficient vacant reservoir space to reduce the risk of spilling, <br />This also reduces the risk of damaging flood releases from <br />Hoover, Davis, and Parker Dams, should large runoff <br />forecasts occur during the 1988 runoff period. Releases from <br />January through July will be based upon the runoff forecasts <br />received during that time but will result in greater available <br />space on August I, 1988, than the minimum flood control <br />requirement of 1.5 MAF. <br /> <br />The plan calls for a total Glen Canyon release in waler year <br />1988 of 8,2 MAF under reasonable minimum inflow <br />conditions, An annual release of 11.2 MAFwould be required <br />under most probable inflow conditions, which would ml Lake <br />Powell to 98 percent full at the end of tbe runoff season and <br />also equalize the active contents of Lake Powell and Lake <br /> <br />Mead to within 1.4 MAF of each other by SeptembeT 30, 1988. <br />With a reasonable maximum inflow during water year 1988, <br />the projected Glen Canyon releases would be 15,5 MAF, This <br />volume of inflow would require 85 percent of maximum <br />powerplant releases during April through June, 80 percent <br />during July, 75 percent during August, and 60 percent of <br />powerplant capacity during the remainder of the water year <br />to avoid the use of Glen Canyon's river outlet works or <br />spillways, <br /> <br />The projected operation for most probable runoff conditions <br />for the major reservoirs in the Colorado RiveT Basin fOT water <br />year 1988 is described in the following pages. <br /> <br />Charts showing the pTojected monthly outflows from each <br />reservoir for the three assumed hydrologic conditions are <br />presented with each reservoir operation, Each of these <br />assumptions uses the most current hydrologic information <br />available by including actual forecasted October through <br />December 1987 inflows, The monthly inflows for the <br />remainder of the year were based upon the following <br />assumptions: (1) reasonable maximum based upon the annual <br />volume of inflow which would be exceeded about 10 percent <br />of the time. (2) most probable based upon the 1906 through <br />1985 natural flows developed for the Colorado River <br />Simulation System (CRSS) model depleted up to current <br />levels; and (3) reasonable minimum based upon the annual <br />volume of inflow which would be exceeded about 90 percent <br />of the time, <br /> <br />4 <br />