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<br />Cloudbursts sometimes occur in this area, but the resultin[1 floods do not have as high rates of runoff <br />as similar floods at lower altitudes, <br /> <br />3,3.4 Rio Grande <br /> <br />J3asin Descriotion- The Rio Grande drains the high mountain park known as the San Luis Valie)! which <br />has an altITude between 7,400 and 7,800 feet The basin is bounded by the almost continuous ring of <br />mountains that separate it from the Arkansas River Basin on the east and the Color~do River Basin <br />on the north and west From the mouth of South Fork, Rio Grande to Dei Norte, at the edgE! of the <br />valley proper, the Rio Grande has an average slope of 17 feet per mile; from Del Norte to the <br />Colorado,New Mexico State line, the slope decreases from 17 to 7 feet per mile, <br /> <br />Flood Characteristics- The Rio Grande Basin, owing to its sheltered position and its relatively high <br />altITude, is less subject to destructive floods than any other major basin in Colorado, except that of the <br />Colorado River. <br /> <br />3.4 References <br /> <br />Foliansbee, R., and Sawyer, LR" USGS, Water supply Paper 997 - Floods in Colorado, '1948, <br /> <br />USACE, Omaha District Compendium of Hydrologic Information - A Supplement to Water and Related <br />Land Resources Management Study for Metropolitan Denver, Volume V, Appendix H - Hydrology <br />1980, <br /> <br />1 This Chapter taken from USGS "Floods in Colorado", 1948 <br /> <br />Colorado Flood <br />Hydrology Manual <br /> <br />3.4 <br /> <br />DRAFT <br />