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<br />. <br /> <br />. <br /> <br />') <br /> <br />~. ., <br />--' <br /> <br />Soil <br />Seri es <br />Billings <br />Ravola <br />Chipeta-Persayo <br />Fruita <br />Mesa (Mack) <br />Hinman <br />Total <br /> <br />Ratio <br />of Total <br />.365 <br />.191 <br />.191 <br />.137 <br />.085 <br />.031 <br />1. 000 <br /> <br />(0 <br />"I''''l <br /> <br />These six soil series are represented by the furrow irrigation studies. <br />Three soils were included in studies conducted in both 1975 and 1976. Two <br />other soils were represented in the 1975 study while one additional soil was <br />included in the 1976 study. <br /> <br />For 1975 data and again for 1976 data, each time increment, le, advance <br />period and runoff period, were segregated to provide, by soil series, the <br />following time weighted parameters: furrow seepage rate in ft/d, days per <br />irrigation, wetted perimeter in feet, row spacing in feet; and by calculation, <br />the net infiltration into the soil profile in inches. <br /> <br />Three summaries were developed representing the average, the least and <br />the greatest seepage rates. The least or greatest were based on either 1975 <br />or 1976 while the average considers both years. <br /> <br />The soil profile infiltrations for the various soil series were then <br />weighted by respective ratio of total to provide the average infiltration per <br />irrigation for both the advance period and the runoff period. <br /> <br />A fourth sunnnary was developed which used the lowest individual seepage <br />rate, for each soil type, for the advance period and the runoff period. The <br />advance period and the runoff period did not have to correspond to the same <br />irrigation event. Time restraints were placed on advance time and runoff time <br />whereby advance time was less than or equal to 360 minutes and runoff time was <br />equal to or greater than 720 minutes. An additional restraint was imposed on <br />the advance application, i.e., it must be equal to or greater than the furrow <br />storage multiplied by 6. <br /> <br />To determine the probable number of irrigations in a season; crops, <br />acreage, evapotranspiration and precipitation were looked at for the years <br />1975 and 1976. Summary data are as follows: <br /> <br />Crops <br />Acres <br />58,660 <br /> <br />ET <br />in <br />26.76 <br /> <br />ASM <br />in <br />3.69 <br /> <br />Eff. Precip. <br />in <br />1. 82 <br /> <br />CU <br />Ac-Ft <br />121,940 <br /> <br />Irrigat ion <br />number <br />7.31 <br /> <br />2 <br />