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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />coefficient (Kc). Based on the distribution by area of the crops, a weighted <br />monthly crop water requirement was calculated, <br /> <br />Crop water requirements were calculated in terms of inches per acre per month <br />using the following distribution of cropland, <br /> Surface Creek Cedar Mesa All <br />Crop Upper Lower Upper Lower Sub-Areas <br /> (%) (%) (%) (%) (%) <br />Alfalfa, Hay 25 25 !f!f !f9 28 <br />Permanent Pasture 26 7 15 12 13 <br />Small Grains 15 13 13 1!f 1!f <br />Corn 5 1!f 11 11 11 <br />Orchards 18 23 8 5 19 <br />Residential Areas 6 11 !f !f 9 <br />Farmsteads and <br />Wasteland 5 7 5 ....2 6 <br /> 100 100 100 100 100 <br /> <br />It should be noted that residential areas include lawns, which have the same crop <br />water requirement as other irrigated pasture land. Farmsteads and wasteland are <br />areas not considered to require irrigation water. <br /> <br />Effective precipitation was estimated using the standard method specified in U,S, <br />Department of Agriculture - Soil Conservation Service Technical Release No. 21 of <br />1977. The effective precipitation as estimated using this method is a function of <br />mean monthly precipitation and crop water requirements, <br /> <br />Monthly CIR values were calculated for a typical dry, normal and wet year, The <br />typical dry, normal and wet year was selected from a series of dry, normal and wet <br />years, Mean monthly precipitation data of the Cedaredge precipitation station <br />from 19!f0 to 198!f was obtained from NOAA climatological data, Using statistical <br />criteria discussed below, every year from 19!f0 to 198!f was classified as either dry, <br />normal or wet with respect to the amount of precipitation during the growing <br />season. <br /> <br />III-15 <br />