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<br />Irrigation Monitoring And Evaluation <br /> <br />N <br />r.., <br />CC <br />c..:, <br /> <br />summary Of The Monitoring site Data <br /> <br />Approximately 238 acres were monitored in 1995. This acreage accounts <br />for only a very small portion (less than 1%) of the total acreage in the <br />Grand Valley. The table below shows irrigated crop acreage for the <br />Grand Valley. The acreage monitored for irrigation in 1995 is also <br />provided. Refer to Appendix B for information on Mesa County <br />agricultural acreage and other statistics. <br /> <br />Crops Total Monitored Percent <br />Monitored Acreage Acres Monitored <br />Corn 19,300 43 0.22 <br />Alfalfa 33,000 54 0.18 <br />Small Grain 4,700 141 3.00 <br /> <br />The average monitored site for 1995 was 30 acres. The eight monitored <br />sites were established in six soil types, five irrigation systems and <br />three crops. Crops monitored were alfalfa, corn, and small grain. <br /> <br />A total of 35 irrigation events were monitored in 1995. The results of <br />these 35 irrigation events collected from the eight sites are shown in <br />Table 2. The Table provides the annual summary of each monitored site. <br />site summary data from each monitored site is compiled and presented in <br />Table 2. <br /> <br />Water application for small grains ranged from 52.4 inches per acre to <br />11.4 acre inches per acre. <br /> <br />The actual evapotranspiration varied for different sites based on crops, <br />time of planting, and harvest date. Table 2 shows the average actual ET <br />to be about 12.9 inches for the eight sites. ETa rates may be <br />overestimated for some crops,. <br /> <br />The average deep percolation was -11. 9 inches for all the sites i 8.0 <br />inches for the 2 surge sites, and 13.2 inches for the conventional <br />sites. Deep percolation for different crops varied considerably, from <br />13.2 inches for small grains, to 4.5 inches for corn. <br /> <br />The average efficiency for all monitoring sites was 32.0 percent. The <br />seasonal application efficiency ranged from a low of 20% for a grain <br />site to a high of 57% for an alfalfa site with gated pipe surge system. <br /> <br />Surface runoff from sites ranged from a low of 7.7 inches to a high of <br />30.2 inches. with the average of 16.6 inches of water or 39% of the <br />total water applied was lost to surface runoff. <br /> <br />6 <br />