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infrequent summer rain storms the short distance to the <br />Colorado River. <br />With the annual average precipitation being 17.5" <br />distributed fairly uniformly over the 12 month period, and <br />with the drainage areas being fairly small and the stream <br />channels quite short, no appreciable flooding has been known <br />to occur. <br />The occurrence of ground water in the proposed <br />areas is controlled largely by the local combination of <br />topography, stratigraphy, and geologic structure. Ground- <br />water recharge on the site areas is minimal due to the <br />steepness of the ridge face and the absence of flat areas <br />and permeable materials. Movement is downward to the first <br />relatively impermeable bed, which is the small perching <br />layer adjacent to the Colorado River. The deeper aquifers <br />which contain hot mineral water drain downdip and discharge <br />to the Colorado River at their lowest point of outcrop. <br />The only occurrance of ground water discharge is from a <br />spring several hundred yards north at alternative site number 3. <br />With respect to surface water, the area is drained <br />by Cascade Creek and other small intermittent stream beds <br />which head along the steep ridge between Oasis and No Name <br />Creeks. These intermittent stream channels flow directly <br />into the Colorado River. No data is available on the <br />quantity or quality of runoff in these streams, but it is <br />minimal. <br />