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<br />I <br /> <br />efforts, including the development of a management handbook, <br /> <br /> <br />may be needed to provide adequate information to communities <br /> <br /> <br />on alluvial fans. <br /> <br />1.3 Study Accroach <br /> <br />The state of the art for flood plain management on fans is <br />poorly developed at present. A good deal of uncertainty <br />exists regarding the nature and severity of flood processes <br />and flood hazards on fans. Engineering techniques used to <br />identify and quantify these hazards are in an early stage of <br />development and, as a result. the design and implementation <br />of flood plain management measures for fans has been <br />uncoordinated and often ineffective. <br /> <br />The 'flooding process on fans is highly complex and, at <br />present. poorly understood by planners ~nd engineers alike. <br />few detailed field observations of fan flooding and <br />virtually no quantitative measurements of depths and <br />velocities have been made. Existing analytic and numerical <br />models for flood hydraulics and sedimentation do not <br />adequately represent these processes on fans. The <br />interations between fan and watershed conditions and <br />hydraulic behavior are poorly documented. Hence, defensible <br />methodologies available for achieving the goals established <br />in Section 1.2 are limited. <br /> <br />A research program which incorporated a literature search. <br />field studies, and physical model studies was selected as <br />being a balanced. state-of-the-art approach to the problem. <br />The literature search was designed to survey the related <br />fields of arid-region hydrology, rlver mechanics, sediment <br />transport, and flood plain management and provide the basis <br />for field and laboratory efforts. Field study locations <br />were selected to represent the widest possible range of fan <br /> <br />10 <br />