WSP04119 - Laserfiche WebLink

Home Browse Search

-----~, 3837 OPERATION '- AND M A I N T E~ N_A NeE 35 San Diego Aqucd1lcts There are two aqueducts delivering Colorado River water to the San Diego Count.i' Water Authority, The first aqueduct, 71.1 miles long extending from the west portal of the San Jacinto Tunnel to the San Vicente Reservoir of the City of San Diego, The Metropoli- tan Water District owns and operates the northerly 36,3 miles of the aqueduct with delivery to San Diego County Water AlIthority at a point 6 miles south of the Riverside-San Diego COllnty line, The line consists of 2,01 miles of 96-inch diameter pipe line, 32,S miles of 72 to 38 inch pipe, 0,89 miles of 72-inch diameter tunnel and 0.60 miles across the 1,400 acre-feet capacity San Jacinto Reservoir. The first two miles of pipe line have a design capacity of 200 cubic feet per second and the balance of the pipe line, sOlltherly of San Jacinto \ Reservoir, has a design capacity of 85 cubic feet per second, The i tunnels were constructed with a design capacity of 165 cubic feet per second to provide for future expansion, This aqueduct was con- structed hy the D,S, Navy as a war emergency mea~ure to provhle an adequate water supply to the San Diego area in support of the war effort. The project was completed in 1947. By 1951 it was apparent that this pipe line would not supply the increasing demand for Colorado River water, The United States Government was enlisted to help finance 60,95 miles of new pipe line between San Jacinto and San Vicente reservoirs, the new line using the seven tunnels of the first line, The second line has a design capacity of 95 cubic feet per second, The District owns the nor- therly portion consisting of 30,9 miles of 75 to 48 inch diameter pipe, With both barrels of this first aqueduct in operation the aque- ,', duct has a designed capacity of 200 cllhic feet per second from the San Jacinto TlInnel to San Jacinto Reservoir, 180 cubic feet per second from the reservoir to the Rainbow Tunnel and 165 cubic feet per second south of the tunneL The second barrel was completed in ] 954 under the supervision of the U,S, Bureau of Reclamation, To meet the increasing demands, the Board of Directors of the Metropolitan Water District, on November 12, 1957 authorized the construction of the northern portion of a Second San Diego Aque- duct extending from the Main Aqueduct at the west portal of the San Jacinto Tunnel to a point 6 miles south of the San Diego County line, Ii distance of 33,7 miles, the balance of the line being lIuthorized and constructed by the San Diego County Water Authority, Work by the Distrid was started in January 1958 and completed ~n April 30, 1960, The line consists of 18,63 miles of 75-inch diameter pipe and 15,04 miles of canals and box siphons, The line has a designee! eapacity of 1,000 cubic feet per second from the turn-out from the Casa Lorna Canal to the end of the 15,04 miles of canal. and 250 cuhic feet per second in the pipe line beyoild the canal. Thi.s permits delivery of 450 euhic feet per second to San Diego County Water Authority at the south end of the Metropolitan Water District's portion of the two aqueducts,