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<br />ALTERNATIVE PLANS <br /> <br />This section describes four alternative plans that satisfy objectives of <br />the study. Each plan consists of two parts; one part discusses recom- <br />mended ~anagement practices, the other discusses needed structural <br />measures. A No-ProJect-Action alternative is the same as the Future- <br />Without-Project-Condition discussed aboye. Vqriable elements used in <br />formulating each plan are shown in Table 12. The recommended improve- <br />ments and estimated implementation costs for each alternative are given <br />in Table 13. The effect of each plan on salt load pickup is shown in <br />Table 14. <br /> <br />Each plan assumes an 80 percent implementation level which reflects two <br />basic premises. First, part of the valley has already received some of <br />the recommended types of land treatment and, therefore, need not be <br />further improved; and second, some farm operators may not participate in <br />the program for any of a variety of reasons. <br /> <br />For the irrigated land a common goal of each plan was to recommend for <br />each irrigation the time of set, or flow rate per furrow, and the number <br />of irrigations per season that will provide the net irrigation require- <br />ment of the crop. These recommendations supplemented by the Bureau of <br />Reclamation's Irrigation Management Services elMS) program can effec- <br />tively and efficiently maintain soil moisture within desired limits. <br />The IMS program provides the irrigator with information which allows him <br />to apply irrigations at the proper soil moisture depletion level and to <br />apply the amount of water needed to replenish the depleted soil moisture <br />plus an appropriate amount for leaching. The IMS program is scheduling <br />irrigations on about 6,000 acres. <br /> <br />Grazing control is an effective means for reducing runoff and erosion <br />from the non-irrigated uplands. Studies on Badger Wash by the USGS and <br />by BlM show as much as 40 percent reduction in runoff and sedimentation <br />by completely eliminating grazing. Therefore, each plan considers <br />control of grazing supplemented by structural measures. <br /> <br />1663 <br /> <br />35 <br />