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13 .. C) , ~~) ~.... c,.') en 106 drainage wells will be collected and conveyed to the plant via ~ the Main Conveyance Channel, Main Outlet Drain and Main Outlet Drain Extension. The flow, 175,000 acre-feet per year at an estimated salinity of 3,100 ppm will be divided, part of it going into the desalting plant and part of.it bypassing the desalting plant. The desalting plant will be designed for 100-million-gallon-per-day capacity, but will be operated normally at 90 million gallons per day to permit necessary maintenance without interrupting normal production. One hundred forty-four thousand acre-feet per year or 129 million gallons per day will be diverted into the plant. The plant will produce 101,000 acre-feet per year of desalted water with a salinity of 240 ppm. This product water will be mixed with the remaining drainage water, about 31,000 acre-feet a year, to produce 132,000 acre~feet a year of 910 ppm water which will then be delivered to the Colorado River above Morelos Dam. This water will have the same salinity as the waters estimated to arrive at Imperial Dam in 1979, the first year of plant operation. The reject stream from the desalting plant, 43,000 acre-feet a year or about 39 million gallons per day, will be conveyed to the Santa Clara Slough north of the Gulf of California by extending the existing Main Outlet Drain Extension which now terminates at Morelos Dam, a distance of 53 miles. The total installed or constructed costs for the Desalting Complex is estimated at $98,050,000. Of that total, $62,080,000 is for desalting plant facilities. Other associated facilities, such as the bypass drain to Mexico, replacing an old flume and reducing the drainage from the Wellton-Mohawk District will add another $35,970,000. Replacing the first 49 miles of the Coachella Canal with a lined section is estimated to have an installed cost of $21,450,000. Total project costs are estimated to be $121,000,000, using April 1973 cost indexes. Work involved in FY 1975 is expected to be largely preconstruction activities. The collection of design data, preparation of a Definite Plan Report, completion of a Preliminary Engineering Report for the desalting plant, and continuation of research and development at the Yuma Test Facility in gathering design data would be the major activities. Construction of a siphon to replace a metal flume in the existing Main Outlet Drain Extension is expected to start in FY 1975. A' total of $26 million has been appropriated for Title I activities in Fiscal Year 1975. These funds are broken down as follows: