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CJ 00 Long Hollow Resorvoir would require un inlet cunal from La Plata River of 400 second-fee t capacity and 4 milos long and un outlot canal of 120 second-fou t capacity and 12.5 miles long. -. , . - c.. Lands under the lower ditches would receive direct benefit from Long Hollow Reservoir. Upper ditches would be benefited to the extent that Long Hollow Reservoir, by release of substitute water, would enable diversion by tho upper ditches of streamflow entitlements of the lewer ditches. During periods when the New Mexico area could be fully sup- plied from State Line Resorvoir, the upper ditches would bo permitted to take streamflow that othorwiso would belong to New Mexico. Long Hollow Reservoir would storo all streamflow in excess of that which (\l'ould bo bonoficially used by Colorado lands. Both upper and lower ditches would be expected to confine thoir early season diversions to minimum noeds in ordor to conserve spring flood water for later and ' (, more boneficial use. State Line Resorvoir, being on the main stream, could mako full uso of winter flows not divertible to Long Hollow Reservoir, also tho earJ.;y season and flood run-off of tho river and its tributaries in excess of the roquiremonts or capacities of ditchos and rosorvoirs in Colorado, as woll as return flow from the Colorado area. Such return flow would bo considerably greater undor the plan than at prosont, becauso of the increased supply available to Colorado aroas. . Because of orosion of the soft formations composing the La Plata Basin, studies indicato the advisability of providing silt storage of 5,000 acre-feet in Stato Line Reservoir to safeguard its irrigation capaci ty for tho 40-yoar repayment period. Little silt would be carried into Long Hollow Rosorvoir. Studies of flood frequency and rates of run-off led to the con- clusion that flood control capacity of l5,OOO acre-foet should be pro- vidod in State Line Reservoir. This capacity is soparate from, and in addition to, the irrigation capacity. Project Costs and Repayment Tho following tabulation sUlllll1nrizes the costs of construction of the project under conditions prevailing January 1, 1940 (which ha~ been selected as representativo of normal conditions); the irrigation repay- ment, based on a 40-year interest-free ropayment period; the flood control benefit; and the deficit in ropayment or allocation of total construction costs: . Division :Construction:Irrigation: Flood Cost :Repayment Control Doficit : Allocati on: Colorado Newl,r)xic 0 :$ 1,474,000 :$ 2,326,?00 593,600 273,600 $ . :$ 880,400 400,000: 1,652,400 Tee ~,l :$ 3,8~0,000 :$ 867,200 :$ 400,000:$2,532,800 15