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<br />, ~ , ,.. - ') <br />.,' ?'''' <br />t. L., V\.J <br /> <br />Diversion from the All-American Canal. <br /> <br />Diversion from the West Main Canal through the Cooper <br />Lateral. <br /> <br />Direct Diversion from the Colorado River. <br /> <br />All-American Canal <br />~ Under this option, shown in Figure water would be diverted <br />r~~~~~hrough an inlet structure located ~the All-American Canal <br />wasteway at Pilot Knob, and conveyed by gravity (about 20 feet of <br />head difference) under the Colorado River and into the Desalting <br />Plant. About 10,000 feet of pipe would be required. The size of <br />the pipe would depend upon the ultimate delivery capacity desired <br />as shown below. <br /> <br />20 Mgal/d <br />30 Mgal/d <br />40 Mgal/d <br />70 Mgal/d <br /> <br />39-inch <br />45-inch <br />48-inch <br />60-inch <br /> <br />The inlet would be designed to withdraw water from the bottom of <br />the wasteway to prevent floating debris from entering the inlet <br />structure. Trash racks would also be added to protect against <br />debris that does enter the structure. A slide gate would allow <br />flow to be stopped for emergencies and the pipeline dewatered for <br />~ maintenance. A temporary cofferdam would be constructed to <br />allow the opening in the counterfort wall to be cut while keeping <br />the wasteway operational. <br /> <br />The conveyance pipe will be jacked under the river with a minimum <br />cover of about 10 feet to avoid interference with navigation, <br />minimize environmental impacts and avoid potential damage from <br />maintenance dredging. Caissons will be constructed for use as <br />jacking pits. Before reaching the Desalting Plant, the <br />conveyance pipe will also cross under the Wellton-Mohawk return <br />flow main outlet extension drain and the Yuma Valley Levee. <br />Prior to entering the Plant the conveyance pipe will intersect <br />the SCR inlet piping with appropriate valving. <br /> <br />West Main/Cooper Lateral <br />In this option water would be diverted from the West Main Canal <br />through the existing turnout structure and into the Cooper <br />Lateral. Since the siphon of the Yuma Main Canal is limited in <br />capacity, this option can only consider deliveries to the City of <br />up to 48 Mgal/d without impacting agricultural deliveries. <br />Designs were developed to accommodate 20 Mgal/d, 30 Mgal/d and 40 <br />Mgal/d deliveries. <br /> <br />The existing capacity of the Cooper Lateral is about <br /> <br />14 <br />