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<br />STEP ONE: DELINEATE TIlE AFFECTED AREA <br /> <br />Definition. The affected area is that which is immediately or <br /> <br /> <br />indirectly affected by the project, This is the geographic area that <br /> <br /> <br />includes the floodplain and all alternate nearby areas that would attract <br /> <br /> <br />development by a major activity, such as industrial or commercial <br /> <br />construction, It also includes the area where development will influence <br /> <br /> <br />runoff into the floodplain area, <br /> <br /> <br />It is during this phase of the study that the flooding problem should <br /> <br /> <br />really be defined, Records should be consulted as to when damaging floods <br /> <br /> <br />have occurred in the area; the areal and vertical extent of inundation <br /> <br />should be determined; and hydrologists should gather information, for the <br /> <br />period of record, on stream gauge and rainfall. <br /> <br /> <br />Use. The existing without-project condition must be properly <br /> <br /> <br />identified since it is the basis for comparison with conditions projected <br /> <br /> <br />with the plan, Existing flood control works should be taken into account <br /> <br /> <br />when determining the degree of protection. An evaluation should be made <br /> <br />of the effectiveness of any existing protection, and all other relevant <br /> <br />systems expected to be implemented before construction, <br /> <br />Procedure, The first step in the process is to delineate the <br /> <br />floodplain for detailed hydraulic and economic evaluation, The affected <br /> <br />area consists of the floodplain, plus all other areas likely to serve as <br /> <br />alternative sites for any activity which might use the floodplain if it <br /> <br />were protected, This can be done by observation and recording of existing <br /> <br />V-4 <br />