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<br />fan and with the flood dynamics of each fan. Generalities <br /> <br /> <br />about the importance of each hazard for all fans are not <br /> <br /> <br />possible. Identified characteristics must be used to <br /> <br /> <br />estimate severity and location of each hazard. <br /> <br />3. Relationships between fan and watershed characteristics <br />and hazard severity are defined in this report. <br /> <br />4. A simple, <br />and velocity <br /> <br />uniform approach to quantifying hazards (depth <br />of flow) will not adequately represent the <br />of fan and watershed characteristics which <br /> <br />broad <br /> <br />range <br /> <br />exists. <br /> <br />5 . <br /> <br />A recommmended approach to hazard <br /> <br />identification and <br /> <br />estimation is suggested: <br /> <br />. gather data on historical flooding; <br />. identify watershed and fan characteristics; <br />. e~timate location and severity of hazards based <br />on flood history,and characteristics; <br />. delineate areas subject to flooding; and <br />. use empirical relationships to quantify flood <br />depths and velocities within the flooded Zone. <br /> <br />2.4 The flood Manaqement Process <br /> <br />1. A flexible, comprehensive approach to flood plain <br />management which is conSiderably different than that used in <br />riverine situations is needed because: <br /> <br />. <br /> <br />the hydraulics of fan flooding are more complex <br />and erratic than that of riverine floods; <br />any management action or new development is <br />likely to substantially change down-fan flood <br />conditions; and <br /> <br />. <br /> <br />17 <br /> <br />