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<br />15 <br /> <br />0,'>_. <br />"'> <br /> <br />With the Plan Approach, official maps of a particular floodplain <br />should show land elevations and also the boundaries of the basic and <br />possibly other frequency floods. <br /> <br />r <br />r <br /> <br />The Case Approach, requires considerable field and office work, but <br />there are ways in which the work can be simplified. This is especially <br />true if flood determinations were made previously for upstream or <br />downstream sites in the vicinity. Agencies named in Section 3 of <br />Executive Order 11296 should be consulted on these matters. There <br />is also the possibility that the site under consideration is in an area <br />studied by the Corps of Engineers, Geological Survey, Soil Conservation <br />Service, Tennessee Valley Authority, or by a State or local water <br />resOurce agency. If it is, then maps in the study report may give <br />site elevations, and elevations of the IOO-year and flood-plain floods. <br />If elevations of lesser floods are needed, they may be determined from <br />information in the report text or obtained from the office that carried <br />out the study. <br /> <br />In a location where a State or local government has established <br />regulations for floodplain use, the Federal agency making the flood <br />haza rd evaluation should consider the provisions of those regulations <br />if they are more restrictive than provisions suggested by these <br />guid eline s . <br /> <br />(7)..... USE, AS THE MINIMUM AMOUNT OF INFORMATION <br />FOR AN EVALUA nON OF FLOOD HAZARD, THE ELEVA TION OF <br />THE LOWEST POINT OF WATER ENTRY (TAKING SEEPAGE UNDER <br />FLOOD CONDITIONS INTO ACCOUNT, IF NECESSARY) AT THE <br />SITE OR STRUCTURE BEING EVALUA TED, THE ELEVA TIONS OF <br />THE APPLICABLE FLOODS AT THE LOCATIONS OF THE SITE OR <br />STRUCTURE, AND THE INTENDED USE OF THE SITE OR STRUCTURE <br />AND ITS CONTENTS. <br /> <br />The lowest point of water entry of a structure may be at the elevation <br />of a basement drain outlet, rather than at a basement window, or it <br />may be at the lowest level of seepage through a foundation during <br />prolonged flooding. <br /> <br />When the "applicable floods" are selected, as discussed in Guideline 6, <br />their elevations will be known. The elevations and the intended use of <br />the site or structure, and the structure contents, will be provided by <br />the applicant. <br />