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-2- <br />• drainage basin into the areas in question, by <br />gravity flow through structures such as ditches, <br />canals or pipes; and <br />2. There are two acre-feet of water available per acre <br />of land which can feasibly be flood - or ditch - <br />irrigated sometime during the period May 1 to <br />September 15 for more than one-third of most years. <br />The two acre-feet quantity may be adjusted to <br />reflect regional differences in evapotranspiration <br />rates and specific crop needs of the area in <br />question. Feasibility shall not be construed to <br />include the legal right to use the water. <br />The above criteria were utilized to determine first the area <br />that was topographically suitable for flood irrigation by a <br />• gravity system, and then to assess the physical availability <br />of water for flood irrigation purposes. Finally, the cost of <br />the irrigation system was determined to evaluate the economic <br />feasibility of flood irrigation. In accordance with the above <br />quoted criteria, the legal availability of water for flood <br />irrigation was not considered. It should be noted, however, <br />that the use of water in Colorado for irrigation or other <br />beneficial purposes requires a valid water right administered <br />by the State under the priority system and that the <br />feasibility of an irrigation project is as likely to be <br />determined by the amount and seniority of direct flow and <br />storage rights as by the physical supply or economical <br />factors involved. <br />C~ <br />Leonard Rice Consulting Waler Engineers. Inc. <br />