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<br />) <br /> <br />development). Sufficient area must be included to insure that the <br /> <br /> <br />affected area is at least large enough to accommodate these major <br /> <br /> <br />categories of potential future uses. When the potential use of the <br /> <br />floodplain includes industrial use within a metropolitan statistical area, <br /> <br />the entire metropolitan statistical area is the affected area; for <br /> <br />residential areas, even within a metropolitan statistical area, a much <br /> <br />smaller area may be envisioned. <br /> <br />All problems and characteristics of the study area should be <br /> <br />evaluated in terms of existing conditions and the base year. The base <br /> <br />year can be estimated by the amount of time for the process of <br /> <br />authorization, funding, and implementation. The period from submission of <br /> <br />a plan to implementation can vary considerably, and delays are commonly <br /> <br />part of the approval and funding process. <br />Several other attributes are critical for proiecting what the <br />floodplain inventory will consist of when land use changes take place. <br /> <br />These attributes are generally assumed to remain constant, unless there is <br /> <br />strong reason to expect demographic changes: 1) population per single or <br /> <br />multi-family housing unit; 2) distribution of activities over the <br /> <br />floodplain area; 3) natural population increase and net migration. <br /> <br />J <br /> <br />STEP NO: PROJECT LAND USE CHANGES <br /> <br />Land use patterns within the basin form the basis for all economic <br /> <br /> <br />and hydrologic change. Any planning study must contain estimates for <br /> <br /> <br />past, existing, and future land uses. The scale of land use mapping will <br /> <br />) <br /> <br />VI-S <br />