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~ ~ ~' , . - ,... -- the extent of the irrigated land in this division is a matter for local dec:l.sion, and the irrigated. area would become established by contracts for supplemental storage water and by irrigation practice. Operation of a reservoir at the 'state Line site would alleviate future damages to New Mexico irrigation systeIDS from floods, such as occurred :l.n August 1919, August 1927, July 1929, August 1930, August 1934, and July 1937, when ditch structures were washed out, with the result that little or no water was diverted during the remainder of the irrigation season, A development period of three years is recommended (in addition to the 2-year construction period), prior to initiation of repayment of construction charges, in order to permit water users to become established on dormant lands. La Plata Project costs and repayment ability are summarized as follows: Colorado Division Total construction costs $1,474,000 Repayment by irrigators for supplemcntal stor- age water, 10,600 acre-feet at $1.40 per acre- foot for 40 years Beyond repayment ability of irrigators Annual cost to irrigators Construction charges 10,600 acre-feet $1,40 per acre-foot Operation and maintenance of reservoir and canals Annual cost per acre-foot 593,600 " 880,400 " at "' 14,840 4,000 $ 18,840 $1. 78 New.Mexico Division Total construction costs flood control benefit $2,326,000 400,000 $1,926,000 Repayment by irrigators for regulated water supply from storage for 3,800 acres at $1,80 per acre for 40 years Beyond repayment ability of irrigators 273,600 ;Pl,652, 400 Annual cost to irrigators Construction charges 3,800 acr'es at $1.80 per acre Operation and maintenance of reservoir Chargeable to flood control Chargeable to irrigation (;; 6,840 $4,500 2,500 Total $ 2,000 8,840 $2,33 Annual cost per acre 2