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. "ir<r". ~uo~', Report of the Regional Director . acre-feet from 8 transmountain diversions, Disposition of the average annual supply was as follows: Di sposi tion Acre-feet , , 656,000 160,000 50,000 277,000 1,143,000 Summer irrigation 0 , Winter irrigation 0 , Reservoir evaporation Outflow to Kansas 0 0 o Total . 64. The estimated ideal headgate diversion require- ments during the irrigation season average 983,000 acre- feeto Reconstructed data showing the effect of Twin Lakes Diversion and the John Martin Reservoir-had they been in operation for that entire period--disclose that the his- torical headgate diversions would have averaged 720,000 acre-feet seasonally, of which 643,00C acre-feet would be within the ideal irrigation scheduleo The difference of 340,000 acre-feet represents the average annual headgate shortage 0 Through optimum utilization of all available supplies, new transmountain diversions, and re-use of return flows, the project could effectuate an estimated supply of 184,600 acre-feet of supplemental irrigation water at the canal headgates in the main valleyo That supply would reduce the average annual headgate shortage to about 155,000 acre-feet--a reduction from 35 percent shortage of ideal requirements to about 16 percent short- age. 650 The total irrigation water supply to be made available by the project would consist of imported water, conserved flood flows, private supplies reregulated in project reservoirs, and usable return flows. Reregulated private supplies include some winter flows of the Arkansas River that are presently diverted for direct-flow use but which, by agreement, could be converted to more beneficial summer use through storage in the Pueblo Reservoir. Re- turn flows of the project municipal water are estimated at 70 percent. The total irrigation headgate supply is estimated . R 21