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<br />. <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 />I <br />I <br /> <br />11. AIRPORT SOUTH DRAINAGE (AREA NO. 11) <br /> <br />This area drains generally the southern portion of the air- <br /> <br />port along with part of the area in the southeast quarter of <br /> <br />Section 27, Township 2 North, Range 48 West. This area <br /> <br />contains approximately 277 acres. <br /> <br />C. <br /> <br />GEOLOGICAL DESCRIPTION <br /> <br />The entire area of the City of Yuma lies entirely within the high <br /> <br />plains section of the great plain physiographic province. The <br /> <br />topography ranges in altitude from about 4, 090 feet to 4,200 feet. <br /> <br />The total relief, therefore, is about llO feet. <br /> <br />The surface of the Yuma area consists of a nearly flat plain, <br /> <br />slightly disected by small intermittent streams. The flat area, <br /> <br />underlain by the unconsolidated deposits, contains some depressions <br /> <br />which are filled with water after heavy rains to form temporary <br /> <br />lakes and ponds. Even though there is no particularly significant <br /> <br />drainage away from the area, it is drained generally by the north <br /> <br />fork of the Republican River. <br /> <br />D. <br /> <br />RAINFALL AND RUNOFF <br /> <br />1. STORM WATER RUNOFF <br /> <br />Storm water runoff results from excessive precipitation <br /> <br />8 <br />