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<br />f~""~-l <br />VlJJ;) <br /> <br />85 cubic feetjsec. In order to accommodate the additional flow <br />the lateral would be reshaped and concrete lined. Additionally '\ <br />replacement of the siphon at First street, five check structures, <br />sixteen turnout structures, and three existing bridges would be <br />required. <br /> <br />Water would flow by gravity through the Cooper Lateral the water <br />would be pumped into the Desalting Plant. A pumping plant would <br />be constructed at the north east corner of the Desalting Plant <br />site directly adjacent to the Cooper Lateral. Depending upon the <br />maximum flow rate selected 3 to 4 pump units would be <br />constructed. A 990 foot pipe would convey the water from the <br />pumping plant to the SCR's. Depending upon the design flow the <br />diameter of the pipe could vary from 39 inches to 51 inches. <br />Power for the pumping plant, would be provided from the Desalting <br />Plant 13.8 kv switchyard and would be stepped down to 480 volts. <br /> <br />A wasteway would also need to be constructed at the pumping plant <br />to divert the flow should the pumping plant suddenly shut down. <br />The wasteway designed includes an overflow spillway which will <br />operate as the water surface rises to protect against the water <br />spilling out of the lateral. A pipeline would convey the wasted <br />water to the Colorado River. <br /> <br />Colorado River Intake <br />A third option would be to divert water directly from the <br />Colorado River. Under this option water would be released from ~ <br />Laguna Dam for diversion through an inlet channel to be <br />constructed off the Colorado River just upstream of the city's <br />sewage effluent outfall. Following the concrete canal inlet <br />transition, the water would flow through and be desilted in a <br />900 foot open inlet channel. A reinforced concrete inlet <br />structure would then transition the flow from the channel through <br />a 200 foot conveyance pipeline to a pumping plant sump. The <br />pumping plant, located adjacent to the Yuma Valley Levee would <br />then pump the water through about 17,000 feet of conveyance pipe <br />to the Desalting Plant. <br /> <br />This design provides for <br />adjacent to the levee it <br />potential flood damage. <br />Mgaljd and <br />70 Mgaljd were developed. <br /> <br />desilting and by locating the plant <br />protects the pumping plant from <br />Designs of 20 Mgaljd, 30 Mgaljd, 40 <br /> <br />COMPARISON OF INTAKE OPTIONS <br />In comparing the intake source options, the 1990 construction <br />costs and other factors are shown in Tables 1 and 2 below. <br /> <br />15 <br />