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<br />~ model, 1978 version. This report should be, used in conjunction with <br />~ <br />0) the Upper Colorado Region's 13(a) Assessment in order to understand <br />U, <br />the river system operation studies and the alternative future <br /> <br />conditions specified in that assessment. <br /> <br />OVERVIEW OF THE STUDY AREA <br /> <br />The Study Area <br /> <br />As defined by the WRC, the Lower Region includes several closed <br /> <br />basins in Arizona, western New Mexico, southern Nevada, southwestern <br /> <br />Utah, and some areas in Arizona and New Mexico that drain into <br /> <br />Mexico. Except for a portion in southern California, the Lower <br /> <br />Region is hydrologically defined by the drainage area of the <br /> <br />Colorado River below Lee Ferry, Arizona. In order to facilitate <br /> <br />identification of economic impacts, the Lower Region was approxi- <br /> <br /> <br />mated by the counties shown in figure 1. The river supplies water <br /> <br />to metropolitan complexes in southern California and central Arizona <br /> <br />and has a service area extending far beyond its physical drainage <br />basin. <br /> <br />The Lower Region, as defined by the WRC, plus Water Resource <br />Subareas 1808 and 1810 in the California-South Pacific Region very <br />closely approximate the Lower Colorado River Service Area (herein- <br />after referred to as Service Area) which is delineated in figure 1. <br /> <br />4 <br />