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Physiographic features must be analyzed to de- termine which areas of tbe site should be avoided or protected during develop- ment. In both riverine (left) and coastal (right) envi- ronments attention should focus on stream channels, drainage patterns, wetlands, and existing vegetation. 46 information from the relevant implementing agency or from the Federal Emergency Management Agency (FEMA) can help determine the probability of the con- trol project being implemented and can give an estimate of its expected effects and completion date. Site Characteristics In addition to hydrologic data, a number of specific site characteristics affect flooding and the choice of strate- gies for flood damage reduction. As with hydrologic data, local planning offices and various federal agencies are primary sources of information on site characteris- tics. In addition to these resources, much of the site analysis depends on site surveys, both visual and techni- cal, by design staff and professional consultants. Relevant site characteristics include the following. Physiographic Features. Physiographic features on the site, such as the location of stream channels or meandering channels, drainage patterns, wetlands, sink- holes, and erosion patterns affect flooding. These natu- ral features should be identified to indicate which areas of the site should be avoided or protected during devel- opment. Such features will affect orientation, distribu- tion, and density of built elements on the site, and will help identify advantages and constraints to be consid- ered in site development. Physiographic features can be I i ~/ \" /i \ i ~j / &\: /iifl) i /~/ .' III t~nl / ~/ i I: I 11/111 I II I 1///1/11 '^ . \ '1 --1fI.I.4+ 'U \ I I 1 I / II?')) i I / Iii ',C/ / I I {31 / / I 1 ~ I I \ ( / / \ I \~ I '11 / iA i 11! / \ I I I i \~;j/ fll{1 ,I / I I ,\ I/~;III\ ~' , //, 1((/\\1 I (I '\'. \ "'0\," (\ \ \ ,,', ~ 1 " ,'~...lf~\ ">.~-----. \\ AA.:::.J \ ~\ '--:::-, \\74:1," \