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WSP10956
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Last modified
1/26/2010 3:15:24 PM
Creation date
10/12/2006 4:37:31 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8210.470
Description
Pacific Southwest Interagency Committee
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
8/1/1963
Author
PSIAC
Title
Pacific Southwest Water Plan - Appendix - August 1963
Water Supply Pro - Doc Type
Report/Study
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<br />8 <br /> <br /> <br />002241 <br /> <br />. <br /> <br />Plan 2 (West Side Rmute)--This plan proposes to conserve and <br />convey an additional water supply of 1,200,000 acre-feet by <br />storage on Trinity River and enlargement of the California Aque- <br />duct. For developing the additional supply two storage reservoirs <br />are proposed on the Trinity River. Helena Reservoir with a gross <br />storage capacity of 2,800,000 acre-feet would be built on the main <br />Trinity River downstream from Lewiston Dam. This reservoir would <br />develop an annual new water yield of 600,000 acre-feet which would <br />be diverted to the Sacramento River. Subsequently, Eltapom Reser- <br />voir, with a gross storage capacity of 3,100,000 acre-feet, would <br />be constructed on the South Fork of Trinity River. This reservoir <br />also would develop an annual yield of 600,000 acre-feet which <br />would be diverted to Helena Reservoir, with subsequent diversion <br />to Sacra~ento River. Power gener~ting facilities would be incor- <br />porated with these proposed developments. Estimated capital costs <br />of these reservoirs and associated facilities are $540,000,000. <br />Annual OM&R costs would be offset by power revenues with a net <br />annual amount remaining of about $12,300,000. <br /> <br />This increased yield of 1,200,000 acre-feet would be conveyed <br />through the California Aqueduct. Incremental capacity would be <br />provided in the aqueduct from San Luis Forebay to the terminal <br />Perris Reservoir. Through the San Luis service area (Federal) a <br />parallel canal is contemplated in view of the advanced construction <br />status of the Federal-State system. The State of California esti- <br />mates the incremental capital cost of facilities for conveying this <br />additional water to southern California at $368,000,000. Savings <br />of approximately $50,000,000 are estimated if the incremental <br />capacity could be incorporated with the Federal-State system through <br />the San Luis area. However, the advanced construction status of <br />the San Luis system makes this improbable. <br /> <br />. <br /> <br />Annual OM&R costs for this increased conveyance capacity, <br />exclusive of pumping energy, are estimated by the State at $3,326,000. <br />Power costs for pumping the additional yield of 1,200,000 acre-feet <br />from the Sacramento-San Joaquin Delta to Perris Reservoir would <br />approximate $25,515,000 on a net basis after deductions for power <br />generated along the route. <br /> <br />The estimated total capital cost for this prospective plan, <br />including storage reservoir systems and incremental conveyance to <br />southern California through the California Aqueduct, is $905,000,000. <br />The net annual OM&R and pumping costs are $16,540,000. <br /> <br />Under this proposal the additional 1,200,000 acre-feet of <br />water would be stored and conveyed to southern California at an <br />estimated average annual equivalent cost of $48 per acre-foot, <br />including interest at 3 percent, and amortization of the facilities <br />in 50 years. <br />
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