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<br /> <br />River Regulation <br /> <br />Colorado River below Davis Dam, Arizona-Nevada <br /> <br />Water release fram Glen Canyon Reservoir <br />during water year 1973 was 10,111,000 acre-feet <br />as measured at the Lees Ferry gaging station. <br />The water passing the Compact point at Lee <br />Ferry totalled 10,141,000 acre-feet and <br />82,930,000 acre-feet for the I-year and 10- <br />year periods ending September 30, 1973, <br />respectively. The annual release of <br />8,230,000 acre-feet from Lake Powell scheduled <br />for the current year based on most probable run- <br />off, when added to the flow of the Poria River, <br />will result in Upper Basin delivery of about 89 <br />million acre-feet for the 10-year period ending <br />September 30, 1974. <br />Water releases scheduled for the Colorado <br />River Storage Project and Participating Project <br />reservoirs were planned to accommodate all of <br />the multiple purposes for which the project was <br />designed plus many day-to-day demands that <br />developed throughout the year. <br />Daily releases are normally made from the <br /> <br />storage reservoirs in the Lower Basin to meet <br />the daily orders of the water user agencies and <br />all water passes through the turbines. The <br />daily releases are regulated ~n an hourly basis <br />to meet as nearly as possible the power loads of <br />the electric power customers. Minimum daily <br />flows are provided in the river to maintain fish- <br />ery habitat. Adjustments to the normal releases <br /><ire made when possible to provide for more <br />satisfactory conditions for water-oriented recre- <br />ation activities, to provide transport for river- <br />borne sediment to desilting facilities, and to <br />provide a degree of control of water quality. <br />River regulation below Hoover Dam was <br />accomplished in a manner which resulted in <br />delivery to Mexico of only 150,543 acre-feet in <br />excess of minimum Treaty requirements during <br />water year 1973. There were 119,855 acre-feet <br />of this quantity which were del ivered pursuant <br />to provisions of Minutes 241 and 242 of the Mex- <br />icon Treaty. <br /> <br />20 <br />