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<br />ti <br />A <br /> <br />" <br />1'1 <br />~,~ <br /> <br />.:,; <br /> <br />Most of the land in the Region remains undeveloped, and much of it is <br />used for pasture and rangeland (72%). Forests and woodlands also comprise <br />a significant portion of the Region (17%), About four percent of the land <br />is used for agriculture and farming, of which about half is irrigated. With <br />regard to ownership, most (70%) of the land is privately owned or owned by <br />state or local municipal governments, twenty-seven percent is in federal <br />ownership, and three percent is Indian land [5]. <br /> <br />~~j <br /> <br />:..~ <br /> <br />.t. <br /> <br />General descriptions of the geology, climate, demography, economy, land <br />use, natural resources, and environment of the study area are contained in <br />the WRC National Water Assessment report for the Rio Grande Region [5]. <br /> <br />, .; <br /> <br />SUBAREA DELINEATIONS <br /> <br />I; <br />, <br /> <br />The Water Accounting Unit (wAUl is the smallest hydrologic subdivision <br />used for analysis in the 13(a) assessment study. These subdivisions were <br />established by the U.S. Geological Survey (USGS) to represent natural and <br />manmade stream drainage areas for purposes of managing the National Water <br />Data Network [6]. <br /> <br />In the Rio Grande Region, thirteen WAU's are designated. These are <br />identified on the map of the Region in Figure 2, and they are listed in <br />Tabl e 1. <br /> <br />t :,' j r,; ~ (, ,__ <br />",. ...~ t. ..l. '-' i' <br /> <br />5 <br />