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Table III -18 <br />Land Fallowing — Reductions in Consumptive Use (ac -ft) <br />Month <br />Reach 10 <br />Reach 14 <br />Reach 15 <br />Reach 16 <br />Reach 17 <br />Reach 18 <br />Reach 19 <br />October <br />0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />November <br />0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />December <br />0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />January <br />0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />February <br />0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />March <br />0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />April <br />5 <br />7 <br />6 <br />6 <br />10 <br />8. <br />3 <br />May <br />10 <br />16 <br />13 <br />12 <br />24 <br />18 <br />7 <br />June <br />89 <br />107 <br />119 <br />139 <br />267 <br />326 <br />285 <br />July <br />210 <br />246 <br />282 <br />342 <br />775 <br />976 <br />817 <br />August <br />188 <br />221 <br />253 <br />315 <br />625 <br />791 <br />705 <br />September <br />15 <br />23 <br />18 <br />24 <br />44 <br />44 <br />29 <br />Annual <br />517 <br />619 <br />690 <br />839 <br />1744 <br />2164 <br />1846 <br />Option 4: Changes in Irrigation Techniques <br />In Reaches 17, 18, and 19 a large portion of return flows return to the Republican River <br />Basin, accrete to the groundwater mound or return to the Platte River below the critical <br />habitat. It was assumed that 50 percent of the return flows do not return to the Platte <br />River above the critical habitat. A 1993 survey conducted by CNPPID indicated that <br />about 50 percent of the surface supplied irrigated acreage within their district is irrigated <br />with techniques that have substantial potential for increases in efficiency. The distribution <br />of land involved in each reach was based on the distribution of acres irrigated with <br />surface supplies. The number of acres that were assumed to be included in this program <br />are summarized in the following table. <br />Table III -19 <br />Chances in Irrieation Techniques <br />Reach <br />Acres Included in <br />Program (ac) <br />17 <br />69800 <br />18 <br />8,700 <br />19 <br />7,400 <br />Total <br />22,900 <br />The tables below show the proposed average monthly reductions in diversions and the <br />reductions in on -farm deliveries for each reach due to efficiency improvements. Although <br />the reductions in diversions were assigned to a reach based on the distribution of irrigated <br />acres, in some cases the reductions would occur further upstream depending on the <br />location of the mainstem headgate. The amount delivered on -farm was based on the <br />average conveyance loss for each reach. Data on conveyance losses was based on <br />county -level information obtained from the USGS Water Use Data for 1995. <br />\\DN00 \E- DRIVE\PROJECTS\Platte \Work Products\Task 9 \wapc report (Version 7).doc 30 <br />