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<br />."j"I <br /> <br />c"') <br />~) type of climatic data needed consists of the following: rainfall, daily maximum <br /> <br />~ and minimum termperatures, solar radiation, wind movement, humidity, and <br /> <br />-, <br /> <br />(- .:... <br /> <br />sunshine duration or cloudiness. Computer programs are available to process the <br /> <br />data. A computer terminal will need to be maintained in both Grand Valley and <br /> <br />Uinta Basin in order to process the data. Presently, the BR maintains one <br /> <br />weather station in the Grand Valley. There is the need for one additional <br /> <br />complete weather station in the Grand Valley area at a higher elevation to <br /> <br />accurately predict ET. In the Uinta Basin there are no weather stations which <br /> <br />can provide all the needed data. It is estimated that three new complete weather <br /> <br />stations are needed because of the variability of climate in the area. <br /> <br />Onfarm Irrigation Water Budgets <br /> <br />Irrigation Event Water Budgets <br /> <br />On farm water budgets will be prepared for each irrigation event, for each <br /> <br />evaluation site, starting with the preplant or start of growing season. The <br /> <br />most significant output from the water budget is deep percolation. Essentially, <br /> <br />deep percolation equals the amount of inflow plus rainfall prior to or during <br /> <br />the irrigation event less surface runoff and the net irrigation requirement. <br /> <br />The net irrigation requirement is the amount of water required to bring the soil <br /> <br />up to field capaci ty. A detailed evaluation procedure for ,each method of <br /> <br />irrigation will be developed prior to implementing the monitoring program. <br /> <br />National Irrigation Guide Notice No.2 presents a procedure for evaluating the <br /> <br />data for border and furrow irrigation. The border procedur,~ will be modified <br /> <br />and used to evaluate semi-controlled flooding. Additional ~/aluation procedures <br /> <br />will have to be developed for sprinkler and trickle irrigation (National <br /> <br />Irrigation Guide Notice No.3) for the determination of deep percolation. See <br /> <br />Table I on page 58 in the Appendix. <br /> <br />26 <br />