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<br />River Regulation <br /> <br /> <br />Pipemoblle guided in placement at CAP pipe <br /> <br />The natural virgin runoff reaching the streams <br />of the Colorado River drainage system above <br />Glen Canyon Dam during water year 1981 <br />was estimated at about 8,2 million acre-feet. <br />Of this amount, about 3,8 million acre-feet <br />were consumptively used within the Upper <br />Colorado River Basin States. <br /> <br />Adjustments in storage in mainstem <br />reservoirs resulted in an inflow to Lake Powell <br />of 6,3 million acre-feet. The release from Glen <br />Canyon Dam, based on measurements at the <br />gaging station at Lees Ferry, Ariz., was <br />8.295.000 acre-feet. For the I-year and 10- <br />year periods ending September 30. 1981, <br />8,310.000 acre-feet and 89,692,000 acre-feet. <br />respectively. passed the compact point at <br />Lee Ferry, <br /> <br />22 <br /> <br />The projected release from Lake Powell <br />based on average, or less, runoff conditions is <br />8,230,000 acre-feet.The projected release for <br />an upper quarfile runoff condition is 9.300,000 <br />acre-feet. When added to the flow of the Paria <br />River, this would result in an Upper Basin <br />delivery ranging from 88,6 to 89,7 million acre- <br />feet for the la-year period ending September <br />30. 1982, <br /> <br />Normally, daily releases are made from the <br />storage reservoirs in the Lower Basin to meet <br />the incoming orders of the water user <br />agencies, All water passes through the <br />powerplant units. The daily releases are <br />regulated on an hourly basis to meet as nearly <br />as possible the power ioads of the electric <br />power customers. Minimum daily flow <br />objectives are provided in the river to maintain <br />fishery habitat. <br /> <br />Adjustments to the normal releases are made <br />when conditions permit to provide more <br />satisfactory conditions for water.oriented <br />recreation ac1ivi1ies, to provide 1ranspor1 for <br /> <br /> <br />Helicopter view 01 Crystal Dam. <br /> <br />rtverborne sediment to desilting facili1ies, and <br />to assist in controlling water quality. Releases <br />from Lake Powell were at least 1 ,000 fP/s <br />during the winter months and were increased <br />to at leas13.000 fP/s during the summer <br />months. Minimum daytime releases during the <br />summer months averaged 8,000 It'ls, <br /> <br />Anticipatory releases and river regulation <br />below Hoover Dam resulted in a total delivery <br />to Mexico ot approximately 2.166,000 acre- <br />feet in excess at the treaty quantity(1.700,000 <br />acre-feet) during water year 1981, Of that <br />amount 131.000 acre-leet at drainage waters <br />were by.passed for salinity control pursuant to <br />provisions of Minute No, 242 of the <br />International Boundary and Water Commission. <br />