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<br />,. Lou rlen~itv rl~veloom~~ can be supported on the <br /> <br /> <br />fan by allowing construction anywhere except on <br /> <br /> <br />existing incised channels and in the immediate <br /> <br /> <br />vicinity of the apex. This is illustrated in <br /> <br /> <br />figure 5.1. floodproofing of all structures, <br /> <br /> <br />preferably by elevation above the flood, would <br /> <br /> <br />be required. Zoning restrictions on minimum <br /> <br /> <br />lot sizes would be necessary to prevent <br /> <br /> <br />constriction of flood pathways and concomitant <br /> <br /> <br />increases in depth, velocity, and other <br /> <br /> <br />hazards. Existing structures would not be <br /> <br /> <br />protected unless retrofitted with dikes or <br /> <br /> <br />other floodproofing measures. flood damages to <br /> <br /> <br />landscaping, streets. and utilities could be <br /> <br /> <br />severe since they are not protected. <br /> <br /> <br />behavior. In addition. such an approach allows comparison <br /> <br />of all alternative flood management schemes (whether whole- <br /> <br /> <br />fan. structural solutions or local. nonstructural tools) and <br /> <br /> <br />the selection of the most cost-effective approach. A key <br /> <br /> <br />step in this whole-fan approach is the implementation of a <br /> <br /> <br />master plan which regulates development and specifies <br /> <br /> <br />required management tools. <br /> <br />5.2 Development Scenarios <br /> <br />The types of management tools which are likely to be cost- <br /> <br /> <br />effective on a fan depend, to B large degree, on the <br /> <br /> <br />location, density, and timing of deveiopment. Three <br /> <br /> <br />development scenarios were suggested by Tettemer (undated), <br /> <br /> <br />as follows. <br /> <br />2. Moderate density development may be Bccomodated <br />in different ways: <br /> <br />58 <br />