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<br />experiments clearly indicate' the need to obtain detailed <br />knowledge of a fan before flood risk is assessed. The <br />application of simplified hydraulic relationships to a fan <br />without consideration of slope. sediment supply. soil type, <br />and fan morphology will result in erroneous conclusions <br />about flood risk. A recommended approach to hazard <br />identification is given in Section 4.5. <br /> <br />4.3 Types Qi Flood Hazards <br /> <br />The flood hazards found on alluvial fans are a result of the <br />high velocity. sediment-laden charaoter of the' flood flow. <br />The data gathered in the field and from the physical model <br />runs have allowed us to identify seven types of flood <br />haZards on fans. In the subsequent listing. the nature, <br />general magnitude. and typi~al location on the fan of each <br />hazaid 'are indicated. <br /> <br />Inundation <br /> <br />This hazard results in damage to a structure's interior and <br />exterior through soaking and minor soiling by water. It <br />occurs on all parts of the fan impacted by the flood flow <br />and may cause the greatest overall damage in a flood event. <br />The inundation of carpeting is likely at those homes exposed <br />to flood waters that are higher than the first floor and <br />this occurrence alone can result in major financial loss. <br />As the flood proceeds down the fan. flood channels widen and <br />inundate larger areas of the fan. inflicting more widespread <br />damage at lower depths. Thus. inundation damages are most <br />severe at individual homes higher up on the fan, but may <br />cause the greatest total damages at lower depths near the <br />fan toe. <br /> <br />44 <br /> <br /> <br />