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<br />\ <br />\J <br /> <br />l <br /> <br />I <br /> <br />orientation, and the economic and political realities of the <br /> <br />subject community. <br /> <br />Available management <br /> <br />options include a <br /> <br />variety of measures which, <br /> <br />either singly or in combination. <br /> <br />should <br /> <br />provide adequate flood <br /> <br />This <br /> <br />section <br /> <br />protection. <br /> <br />defines the key issues which must be considered and suggests <br />a methodology for selecting flood plain management tools. <br /> <br />The design of management tools depends on: <br /> <br />1. performance requirements. <br /> <br />2. <br /> <br />susceptibility of <br /> <br />the <br /> <br />tool <br /> <br />to anticipated <br /> <br />forces (hazards) during floods. <br /> <br /> <br />3. physical constraints on size and orientation, <br /> <br /> <br />4. public acceptance, and <br /> <br />5. cost. <br /> <br />Of <br /> <br />, t h es e <br /> <br />considerations, <br /> <br />physical <br /> <br />constr-aints <br /> <br />and <br /> <br />performance requirements are site and application specific, <br /> <br />while cost. <br /> <br />susceptibility. <br /> <br />and <br /> <br />public acceptance are <br /> <br />related to the measure itself. <br /> <br />Performance requirements specify the discharge. <br /> <br />velocity. <br /> <br />sediment load, <br /> <br />and/or depth of flow which must be contained <br /> <br />or cont roll ed <br /> <br />They are determined <br /> <br />from <br /> <br />by the measure. <br /> <br />hydrologic and hydraulic analyses of <br /> <br />the watershed and fan. <br />deposition and momentum <br /> <br />and, in turn, <br /> <br />determine the scour. <br /> <br />forces affecting the measure. <br /> <br />Physical constraints include <br /> <br />such <br /> <br />restrictions as <br /> <br />available land, <br /> <br />existing channel <br /> <br />patterns, <br /> <br />existing development density, <br /> <br />previously <br /> <br />and <br /> <br />installed measures. <br /> <br />Susceotibilitv Q..i li i.Q.Ql. to hRzRrc,s on fans will be assessed <br /> <br />in Section 6.3 based <br /> <br />on tool <br /> <br />performance in the physical <br /> <br />models, reported performance of tools on prototype fans, and <br /> <br />guidelines for <br /> <br />flood management tool design <br /> <br />( e. 9 . , <br /> <br />ItLe'Jee <br /> <br />Design Manual." U.S. Army C.O.E.). <br /> <br />Susceptibility is severe <br /> <br />70 <br />