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<br />. <br /> <br />gained in the interpretation of the lOO-year flood <br />boundary as delineated in Figure Often, both <br />large and small iSlands, which would previously have <br />gone unnoticed, become apparent. The flood contours <br />become permanent documentation of the engineer's <br />judgement in interpretating the flood hazards. <br /> <br />-29- <br /> <br /> <br />The method is also applicable to approximate flood- <br />plain mapping where a water surface profile can be <br />drawn using an assumed depth. Once the depth has <br />been assumed, it is easy to show in plan view which <br />areas would be flooded and which would not. <br /> <br />. <br /> <br />The delineation oe the floodplain will need to be <br />re-evaluated or re-defined if development activities <br />or other factors cause a sufficient change in the <br />floodplain. When this needs to be done, it is <br />important that previously published information be <br />reviewed and adequately correlated with the new <br />information. By comparing study findings continuity <br />can be maintained between studies to improve the <br />workability of a floodplain management program. <br /> <br />. <br /> <br />Floodplain developers who use flood elevations <br />established in the floodplain study as a guide must <br />use that information accurately. The establishment <br />of field survey datum continuity between the study <br />