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The allocation of both these costs has been prepared on the basis of "Mean Measure of Use." This is an average of cost assignment proportionate to capacity needs and cost assignment proportionate to annual quantities. In the enlargement of the California Aqueduct it is proposed that portions of this segment would be done on a deferred construction basis. Only those facilities requiring joint construction with the basic aqueduct would be built initially. This would permit deferment, for possibly 5 or 10 years, of expenditures approximating one-third of the cost for such items as pumping plants and other such facilities. In the event authorization of the Pacific Southwest Water Plan is not obtained in time to permit incorporation of the additional capacity with the California Aqueduct, a parallel conveyance system could be constructed from the Wheeler Ridge Pumping Plant No. 1 to Cedar Springs Reservoir. However, a major savings, estimated at over $100,000,000 can be realized through enlargement of the Wheeler Ridge-Cedar Springs section of the aqueduct, as contrasted with construction of a separate conduit. The California Aqueduct, a key feature of the State Water Plan, is now under construction. Construction has already advanced from the delta southward to such an extent that savings through enlargement will be practical only for that portion southward from Wheeler Ridge. With this in mind, the proposed enlargement of the California Aqueduct from Wheeler Ridge to Cedar Springs Reservoir for conveying 1,200,000 acre-feet for the Pacific Southwest Water Plan has been included in the plan for immediate authorization. This authorization should be obtained in 1964 since the State of California plans to begin final designs for this section of its aqueduct in 1965. North Coastal Storage--The Initial Pacific Southwest Water Plan proposes inclusion of facilities for the conservation of 1,200,000 acre-feet of surplus northern California water and its conveyance south for use in the southern California portion of the Pacific Southwest area. The storage facilities tentatively proposed in the Initial Pacific Southwest Water Plan, for demonstration of economic justification and financial feasibility of the entire plan, consist of Helena Reservoir on the main stem of the Trinity River and the Eltapom Reservoir on South Fork Trinity River, with tunnel diversion to Clear Creek, and thence, down that stream through a series of regulatory storage and powerplants, to the Sacramento River. These facilities are shown in plan and profile on plate 2. As stated, this proposal is tentative; further studies may indicate the selection of an alternative storage and diversion plan. 6Epson Perfection 4870 Photo, 400 dpi, 8 bit, 14,929,920 byte