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<br />Guidelines and Specifications for Flood Hazard Mapping Partners [April 2003] <br /> <br />. When the previous erosion analyses were conducted (if they were included III the <br />previous analysis); <br /> <br />. Whether any seawalls or other structures have been constructed; <br /> <br />. Whether dunes have been built/rebuilt or otherwise enhanced; <br /> <br />. Whether any major storm events may have changed the beach profile, <br /> <br />. Whether any major storm events may provide data; <br /> <br />Whether any significant beach or dune erosion has occurred; and <br /> <br />. Whether more detailed topographic data is available for coastal areas. <br /> <br />Each of these factors is discussed below. <br /> <br />Age of Previous Wave Height Analyses <br /> <br />A critical first step in the Mapping Needs Assessment is to determine when the most recent <br />coastal analyses were conducted. As mentioned in Subsection 1.2.3.1, the methodology for <br />c'oll~tll 1 llnll ly~e~ hllS changed suhstantially since the 1980s, requiring that the Mapping Partner <br />performing the Mapping Needs Assessment detennine whether all currently accepted <br />methodologies and protocols have been applied. <br /> <br />Age of Previous Erosion Analyses <br /> <br />The Mapping Partner performing the Mapping Needs Assessment shall determine when the most <br />recent erosion analyses were conducted and whether the previous analysis is adequate to <br />represent the existing beach profile. <br /> <br />Construction of Seawal1s or Other Structures <br /> <br />Some flood-control structures such as seawalls are designed to protect certain areas from <br />inundation or otherwise reduce flood elevations. Therefi)re, the Mapping Partner performing the <br />Mapping Needs Assessment shall evaluate carefully any new coastal flood-control structures <br />determine whether they have a significant effect on th(~ flood hazard delineation and/or flood <br />elevations. The private entity, Federal agency, or local organization that built and/or administers <br />the structure should have information about that structure:. <br /> <br />Effects of Major Storm Events on the Beach Pro me <br /> <br />The Mapping Partner performing the Mapping Needs Assessment shall determine whether <br />significant storm events have changed beach profiles enough to alter the flood hazard delineation <br />along the shoreline. If a beach profile has changed, it may have an effect on BFEs and may <br />move the inland limit of the floodplain. <br /> <br />1-21 <br /> <br />Section 1.2 <br />