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<br />As the rain lessened, several residents who live <br />high on the skirts 01: Lookout Mountain in southeast <br />Glenwood began hearing rumbling noises. <br />Sheriff Ed Hogue, looking up the mountain from his <br />residence near the ri.ver, saw a huge wall of mud, <br />flowing down the red dirt mountainside like lava from <br />a volcano. It carriE~d impressive boulders and lifted <br />massive trees out of the ground. <br /> <br />Clearly, protection from future eve.nts requ1res rE~cognition of the <br /> <br />differences between debris flows and commonly observed water floods. <br /> <br />Active expansion of Glenwood Springs is taking plaee on debris fans <br /> <br />that have been built by debris flows originating in the many small drainage <br /> <br />basins located in the surrounding hills. As more development takes place <br /> <br />on these fans the hazard from debris flows will continue to increase roughly <br /> <br />lD proportion to the number of people living i.n such areas. <br /> <br />Similar problems <br /> <br />exist at many other Colorado location.. <br /> <br />The objective of the present study is to research in detail the debris <br /> <br />flows from three small drai.,age basins in the southern part of Glenwood <br /> <br />Springs (Figure 1). <br /> <br />Specifically, the study is designed to: <br /> <br />1. Relate the volumes of material removed from the basins <br /> <br />in the most recent events to the volumes of material <br /> <br />remaining in an unstable state in the basins. <br /> <br />2. Evaluate the present hazard potential. <br /> <br />3. Quantify the dynamics of the recent flows rn terms of <br /> <br />peak velocities and debr:Ls discharges. <br /> <br />-- 3 -- <br />