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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />148<\ <br />0.4 PRELIMINARY PRACTICABLE IRRIGABLE ACREAGE <br />0.4.1 Existing Irrigated Lands <br />Lands currently irrigated are assumed to be PIA requiring no further <br />evaluation. Table D.2 summarizes the currently irrigated acreage <br />in the watershed. The acreage is also identified on maps included as <br />Figure D.l through D.IO. <br /> <br />TABLE D.2 <br />CURRENTLY IRRIGATED ACREAGE <br /> <br /> Currently Non- <br />Parcel Irrigated Irrigated <br />No. Gross Acres Gross Acres <br />M1l6 68 102 <br />M329 37 66 <br />M330 56 9 <br />M331 73 102 <br />Unparce11ed 4 <br />TOTAL 238 279 <br /> <br />D.4.2 Water Supply <br /> <br /> <br />An examination of the hydrology data for the Mancos River shows that <br /> <br /> <br />there is insufficient virgin flow dur ing the summer irrigation <br /> <br /> <br />periOd to serve the potential arable lands directly from the river. <br /> <br /> <br />Therefore, it was necessary to per form opera t ional stud ies involv ing <br /> <br /> <br />storage reservoirs (see D.4.5). <br /> <br />D.4.3 Cropping Pattern <br />For the preliminary analysis of PIA, a cropping pattern with the <br />highest net agricultural returns was used. Table D.3 identifies <br />this cropping pattern as well as the net agricultural return. <br /> <br />9 <br />