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<br />* <br /> <br />which.water is desired for each day of the following week. At present <br />water is available each year in quantities greater than irrigation require- <br />ments; and users within the United States are not limited as to quantities <br />or rates in any month. For Mexico, maximum and minimum rates of <br />delivery are established by treaty, so Mexico's orders must stay within <br />those rates, and within previously scheduled quantities for each month <br />and year. <br /> <br />~ <br /> <br />The total of water orders and estimated river losses below Parker <br />Dam determines the release from that Dam for. each day of the coming <br />week. To this are added or subtracted scheduled changes in storage at <br />Havasu Lake for flood control, scheduled diversions by the Metropolitan <br />Water :District, and estimated losses above Parker Dam, to determine <br />the daily releases from Davis Dam. Similarly, the releases from Hoover <br />Dam are determined by considering the Davis Dam requirementS, adjusted <br />as necessary on account of the Mexican Treaty obligation, and the losses <br />up to Hoover Dam. <br /> <br />. <br /> <br />Thus the water users are assured sufficient water in the river to <br />meet all orders, except in case of accident or other unusual occurrence. <br />However, this completes only about half the operating problem. Allottees <br />for Hoover power must be informed by telephone of the amount of water <br />to be released from Hoover Dam during the coming week. They in turn <br />make up daily schedules of generation, utilizing the available water, with <br />whatever restrictions as to time may be placed upon such use. Since <br />completion of Davis Dam, it usually has not been necessary to restrict <br />Hoover releases as to time within any week, because the storage capacity <br />above Davis Dam is sufficient to absorb reasonable fluctuation in daily <br />releases from Hoover. The water scheduling process for Hoover Dam <br />fOr the coming week is then complete, upon final adoption of daily <br />di stribution. <br /> <br />. <br /> <br />The scheduled releases from Davis and Parker Dams, and the <br />estimated daily elevations of Lake Mohave and Lake Havasu. are furnished <br />to the Bureau's power dispatching office at Phoenix. Since Havasu Lake <br />can absorb minor 'fluctuations, the dispatching office has some leeway as <br />to the ultimate schedule for daily releases from D.avis Dam, but since <br />daily re1eases from Parker Dam are scheduled to meet irrigation require- <br />ments, the power dispatching office has no leeway there. Upon completion <br />of powei schedules for the week, based upon the water schedules furnished <br />them, the power dispatching office notifies the Office of River Control, <br />where the distribution of releases is finally checked, confirmed <br />or further revised. <br /> <br />. <br /> <br />After water is released from Parker Dam, there is no opportunity <br />for further control downstream. The schedule therefore must be as <br />nearly accurate as possible, and conformance to the schedule is an. <br />absolute :necessity. If a shortage occurs at Imperial Dam, a request <br />for additional water, if acted upon immediately, cannot be fulfilled until <br />72 hours later. <br /> <br />. <br /> <br />The scheduling and dispatching process is almost reversed during <br />months or years when there is always more water in the river than re- <br />quired for irrigation. Under this circumstance, the first step is to <br /> <br />-27- <br />