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" . . additional Narrows storage has been included in the totil1 co'st ot. the feature which is $4,107,000. Detail costs are shown in Tab1~ 3. The annual equivalent cost of construction is $821140, the annual OM&R and pumping is $57,l30, the total annual cost is ~139,270, and the incremental cost per acre -foot is $4.32. B.v this feature water is delivered to the North Sterling' ditch 7 miles above the reservoir instead of at the river headgate 63 miles from the reservoir, so transportation losses would not be so great. This feature appears to be self-supporting if channel storage is supplied. The storage could probably be supplied by either a reservoir at Narrows or Weld County, although we have' not checked it for the Weld County site. At a previous meeting it was pointed out that the average exchange potential of Narrows Reservoir to the Bijou ditch, 11,000 acre-feet, was not available when most needed in the dry periods because water was not available in the river at these times to effectuate the .exchange. We made a study to see to what extent this condition could be alleviated by exchanging water to Empire Reservoir in the winter and early spring before the irrigation season started. The study only utilized vacant space in Empire Reservoir so as not to interfere with the existing efficiency of the system. An average of 13,300 acre-feet was exchanged to the river headgate for the years 1952-1957. The construction cost of this item is zero. Let us now consider the aggregate of these three innovations with the Narrows Reservoir. Table 4 Ac. Ft. with Ac. Ft. with all three Narrows only . The total annual water supply ll7,200 85,000 $44,426,000 $38,334,000 Total cost Service area Bijou, Riverside all ditches between and North Sterling Shortages remaining in above service area 29,800 acre-feet instead of l33,500 acre-feet as at present. 4