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Table 3.1 Timnath Pit Property Historical Irrigated Acreage. <br />Palxel ~ Acreage <br /> <br />Northea~t Field (Grain Corn) - - -- - - -- <br />70.1 acres <br />Southwest Field (Alfalfa) 20.6 acres <br />In~igated Pasture 151.7 acres <br />Unirrigated Pasture 41.7 acres <br />Total 24.1 acrc~.c <br />3.3 Crop Irrigation Requirements <br />Throughout his nearly 30 years of farming the property John Weitzel irrigated three primary <br />crops; corn, alfalfa and pasture grass. The northeast field was used primarily for growing corn, and <br />the southwest field for alfalfa. The rest of the property minus the house, yard, roads and outbuildings <br />was in pasture exa~pt for Mallard Creek, which runs through the property, and a drainage ditch on <br />the south side. Since each parcel was primarily only in one crop, the crops were distributed <br />according to the a~•eas of each irrigated field and pasture divided by the total irrigated area. The <br />resultant distribution is: 29% in corn, 63% in pasture grass, and 8% in alfalfa. <br />A consumptive use analysis was performed for the irrigated acreage based on a modified <br />Blaney-Criddle ev~ipotranspiration model documented in Irrigation Water Requirements, Technical <br />Release No. 21, United States Department of Agriculture, Soil Conservation Service (now the <br />Natural Resources Conservation Service), September 1970. Monthly temperature and precipitation <br />data were taken from the NOAA Fort Collins weather station for use in the Blaney-Criddle <br />evapotranspiration equation. The average annual crop irrigation requirements for the 19b0 to 1989 <br />study period are shown in Table 3.2 for the three crops grown on the Timnath Pit property. The <br />individual crop irrigation requirements are averaged, by area, to compute an average crop irrigation <br />requirement (CIR). Table B.3 in Appendix B lists the monthly CIR values averaged for all of the <br />crops on the farm.. <br />Table 3:2 Crop Irrigation Requirements. <br />Croy Irri~,:~icd :1rca <br />-acres I Irrigation Itequirentent <br />(ft <br />Corn (grain) 70.1 1.21 <br />Pas~ure Grass 151.7 1.58 <br />Alfalfa 20.6 1.87 <br />area iT'e,glrteriAverage N/rf - -~ - - - -L49 <br />C:1Projects\CODKCOI\Admin\DKC 2006 SWSP Application.doc 6 Scott .Water Engineers, LLC <br />