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<br />THE SETTING 7 <br /> <br /> <br />T- <br /> <br />I <br /> <br /> <br />j <br /> <br />I <br /> <br />UTAH <br /> <br />NEVADA <br /> <br />CALIFORNIA <br /> <br />ARIZONA NEW MEXICO <br /> <br />Existing dwet'S.ons 4.78 mat. Width of arrow proportional to diversion <br />Additional authorized diversions .41 mat. (adapted from Quinn, 1968). <br /> <br />FIGURE 2 Diversions out of the Colorado basin. <br /> <br />To a striking degree, the rate and manner of lerosion are controlled by the <br />composition and attitude of the rocks. The stripping of weak formations <br />from strong ones and the undermining of strong formations by the erosion of <br />weak ones has produced much of the dramatic scenery of the basin. <br />Erosion is rapid. Despite the sparseness of rainfall, its marked concentra- <br />tion in space and time makes the occasional streams of the region remarkably <br />