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2 .... -, !",.,''''' G~JO . SupplementaJ. studies were based on the reservoir having an ultimate totaJ. storage capacity of 105,700 acre-feet with 20,000 acre-feet aJ.lotted to conservation, 46,700 acre-feet to flood control and 39,000 acre-feet to sediment retention. An average conservation capacity of 39,500 acre-feet was used in reservoir operation studies and is representative of the conservation capacity.at the midpointot: the' payout period of the project assuming a sediment reserve of 39,000 acre-feet. The initiaJ. conservation capacity including sediment reserve would be 59,000 acre-feet and the con.. servation capacity at the end of 75 years would be 20,000 acre-feet or the original storage decree of the Model Reservoir. The project area consists of about 19,700 acres of presently . irrigated land below the Trinidad Reservoir site. The project area is served by 13 ditche$ ranging in capacit;\rfrom one second-foot to 700 second-feet. lilKcept for limited storage in the oU-channel Model Reservoir, which serves about 6,200 acres of the irrigated area, no storage or regulation is available for the flows of the Purgatoire River. The Model Reservoir has a 20,000 acre-foot storage decree, but a reservoir survey in 1946 indicated a usable capacity of only 6,200 acre-feet due to sediment deposition and deterioration of the dam. The water supply for the Trinidad Project consists of base flows, snowmelt and rain flows from intense summer storms and is represented by the recorded annual runoff of the Purgatoire River at Trinidad, Colorado. The recorded annuaJ. runoff has ranged from . 16,300 acre-feet in 1951 to 197,300 acre-feet in 1942 and has averaged about 62,100 acre-feet during the 1925-l9~7 study period.