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<br />. <br /> <br />describe the depth of flow along a selected study <br />reach and present it in profile view. The~e depth <br />of flow determinations assist in establishing regu- <br />latory flood elevations for the 10-, 50-, 100- and <br />SOO-year floods and allow the preparation of a <br />floodplain map for the flood hazard area in plan <br />view. <br /> <br />The 10-, 50-, 100- and 500-year water surface eleva- <br />tions and profiles must be calculated by using the <br />Corps of Engineers' BEC-II Computer Program or an <br />acceptable backwater - step procedure (see <br />Glossary). <br /> <br />. <br /> <br />-23- <br /> <br /> <br />. <br /> <br />Water surface profiles must be plotted for 10-, 50-, <br />100- and SOD-year frequencies to aid in the inter- <br />pretation and delineation of the floodplain. If a <br />floodway has been computed, it must: <br /> <br />o <br /> <br />o <br /> <br />be computed by the BEC-II procedure. <br />comply with FEMA guidelines: <br />be shown on an administrative map. <br /> <br />o <br />