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( ( 3. Operation and Haintenance and Rep1<1cement The Annual Op-eration, Maintenance, and Replacement Costs for the U~compahgre Project irrigntion delivery system for the year" 1971 through 1980 inclusive is listed below. The average annual rate of increase is about 25 percent for the past five years. Table IV Uncompahgre Valley OH&R Costs Year Operation Maintenance TIn 98;000 254,000 1972 120,000 246,000 1973 113,000 282,000 1974 118,000 347,000 1975 125,000 327,000 1976 150,000 303,000 1977 184,000 345,000 1978 213,000 408,000 1979 247,000 583,000 1980 229,000 812,000 1971-1980 Inclusive Adminis trative 99,000 105,000 109,000 132,000 146,000 159,000 185,000 220,000 286,000 428,000 Total 451,000 471 ,000 504,000 597 ,000 598,000 612,000 715,000 841,000 1,116,000 1,469,000 The items which could be impacted by implementation of the candidate plans are: Operation: winter stock water Maintenance: weed and brush control silt removal road maintenance canal bank repair structure repair equipment costs It is anticipated that the variance of the costs of these items will parallel the overall varIance of all OM&R costs in the "Future Without" condition. Forecasting future OH&R cos ts appears highly speculat ive. HO'Never, a linear extrapolation of total OM&R costs based on the listed ten years of record indicates an average rate of increase of about fourteen percent per year. A linear extrapolation appears to be appropriate since the procedure will dampen out effects of sudden increases in costs ~lich reflect infrequent major repairs or need for rehabilitation and betterment programs. Periodic Rehabilitation and Betterment programs lH;ve been \lsed in the Uncompahgre Project to keep rap id 1y 001662 escalating maintenance costs at acceptable rate~ of increase.