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<br />CJ <br />r.;,) <br />,t) <br />..-l <br /> <br />c..-..:~ <br /> <br />prior to the first irrigation, and, 2} post-irrigation S.W.D. plus ETa <br />minus effective rainfall after the first irrigation. <br /> <br />Deep percolation (D.P.): Deep percolation equals the infiltrated water <br />depth minus the so i I water def i c i tin inches at the time of each <br />irrigation. The deep percolation was calculated using a computeri2ed <br />water budget program. <br /> <br />Seasonal/Individual Appl ication Efficiencv: The seasonal/individual <br />appl ication efficiency, expressed as a percentage, equals the volume <br />of inflow minus the volume of outflow minus the deep percolation times <br />one hundred, divided by the volume of inflow. <br /> <br />RESULTS AND DISCUSSION <br /> <br />Approximately 371 acres were monitored in 1990. This acreage accounts <br />for only a very small portion (less than 1%) of the total acreage in <br />the Grand Va II ey. Refer to Append i x A for i nformat i on on Mesa county <br />agricultural acreage. <br /> <br />A total of 186 irrigation events were monitored in 1990. The results <br />of these irrigation events from 25 sites are shown in Table 2 as the <br />1990 Annual Summary. Irrigation data from individual sites are <br />presented as site summary data in Appendix B. The annual irrigation <br />summary for the 25 sites in Table 2 as well as other tables also <br />include data from surge and comparative conventional sites to estimate <br />an overall average. Data from comparison sites are discussed in <br />detai I under the section, "Surge and conventional irrigation <br />compar-isonll. <br /> <br />Of the 16 original sites started in 1985, only seven of them were <br />monitored through 1990: sites 11, 12, 15-18, and 21. Of the seven <br />sites, only two sites, 11 and 17, sti I I have the same crop as 1985. <br />In the Grand Valley, fields that are in annual crops or alfalfa go <br />through a crop rotation. Thus makes it is impossible to compare al I <br />individual monitored sites for different years. Site comparison data <br />from 1985 through 1990 is provided for sites 11, 14, 15 and 17 in <br />Table 3. AI I other sites were either monitored for one or two years <br />only, or the sites had to be discontinued because landowners had <br />problems, or because of change in crops. <br /> <br />The 1990 results are discussed in the next several pages. <br /> <br />12 <br />