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<br />." ,.. r', 1 <br />J. C" <br />M <br /> <br />Mf:'I'ROrOLITAN WATER DISTRICT <br /> <br />I <br />I <br /> <br />pressures, elevations of service at different loc,1tions, present needs, <br />and future demands. <br />Because of the character of the service required and the great <br />quantities of water to be conveyed over long distances the dish'i- <br />bution system of the District does not correspond to a conventional <br />municipal pattern. The long distances from the main storage at <br />Lake Mathews to the points of delivery require considerable drop <br />in the elevations of hydraulic gradient to maintain the necessary <br />flow. If these large pipe lines were designed in a manner similal' <br />to conventional distribution systems with shutoff valves at the <br /> <br /> <br />Outlet to/vel' nt Lake Mathews <br /> <br />end of the pipe, when the demand diminished or was shut off alto- <br />gether at the lower end of the line the pressure in the pipe would <br />build up to the level of the water at the upstream source of supply. <br />To provide for this greatly increased pressure the strength of the <br />pipe would have to be increased and the cost of the pipe would be <br />correspondingly increased. In the case of the upper feeder the <br />increase in cost to provide for such a design would amount to <br />several millions of dollars, Economy therefore dictated that the <br />upper feeder be designed for a hydraulic gradient with an unob- <br />structed flow of maximum required capacity. The demand for water <br />at the points of delivery will be satisfied by the careful dispatching <br />of water from Lake Mathews and the excess or deficiency in the <br />release of water therefrom will be absorbed or supplied by equaliz- <br />