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<br />I <br /> <br />. <br /> <br />more types of hazards are present <br /> <br /> <br />flooding than in riverine floods and <br /> <br /> <br />the hazards are much more severe. <br /> <br />in fan <br />many of <br /> <br />2. The application of flood management tools depends, in <br />part, on the location, density and timing of development. <br />When a master plan for development is created before a fan <br />becomes urbanized. choices between tools can be made to <br />maximized benefits. If development occurs without a master <br />plan, the flood management choices are dictated by existing <br />structures and development patterns. <br /> <br />3. Three development scenarios have been hypothesized. as <br />follows' <br /> <br />. low density, where structures are elevated and <br />minimum lot sizes are enforced; <br />. moderate d~nsity. where either developments are <br />protected by local measures and allowed to <br />occupy much of ,the fan or are protected by <br />reserved floodways and levees and zoned to <br />provide for the open space required; and <br />. high density. where whole-fan tools such as <br />channels are used to confine and convey the <br />flood from apex to toe. <br /> <br />These scenarios can be used to focus planning decisions on <br />the effect of density on flood plain management. <br /> <br />2.5 Selection Qi Flood Plain Manacrement Tools <br /> <br />1. The following management tools have either been used on <br />fans in the past or have been shown in the physical model <br />tests to be of significant value: <br /> <br />18 <br />