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<br />1.7 <br /> <br />fans is an epi sodi c process, separated by peri ods of channel i nci s i on and fan <br />trenching. Mud flows create highly recognizable dE!positional features on <br />alluvial fans, including levees, unsorted bou'lder deposits, lobate snouts, <br />lateral deposits and irregular channels. <br />The diverse variables and complex fluid mechanics invo'lved in mud flows <br />make prediction of their characteristics on a given fan difficult. Fan incision <br />and headcutting during one flow event may be followed by deposition and storage <br />of sediments in channels in the next. Over geologic time, climatic changes and <br />tectoni c act i vity may also alter the trend of fan deve"lopment. The epi sod i c <br />growth and overall slope of an alluvial fan is the cumulative result of the <br />watershed geometry, geology, hydrology, and availabnity of sediment source <br />material. <br />In view of the complexities associated with mud flow events, the <br />application of mathematical models for predictive purposes is limited to <br />simulating a general range of flood hydraul ics based on justifiable assumptions. <br />The potential range of flow depths, veloc'ities, and area of inundation should <br />be identified by considering the possible variations in fluid properties and <br />flood scenarios. The delineation of flood-hazard areas should consider the <br />integration of flood characteristics for clear-water floods and mud flows.' <br />