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10 GUIDELINES The guidelines with explanatory notes after each one where appropriate are numbered for reference, in about the same order as the problems that arise in preparing for and making a flood hazard evaluation. However, it is best to consider all of the guidelines before following anyone of them. In carrying out their responsibilities under Executive Order 11296, the Federal Executive Agencies should: (1). . . . . DETERMINE FIRST, WHEN A PROPOSED USE IS EXAMINED, WHETHER THERE IS ANY NEED TO EVALUATE THE FLOOD HAZARD AT THE SITE OR STRUCTURE LOCA TION BEING CONSIDERED. Essentially, this means no more than deciding whether the site or structure may be in a floodplain. Using the Plan Approach, the agency will already have official maps for the area, so that the decision can be made immediately. Using the Case Approach, the agency either makes a brief preliminary investigation (has its experts obtain and examine maps of the area or visit the area) or requests the information from one of the agencies named in Section 3 of the Executive Order, or other appropriate source, before making the decision. If it is decided by the concerned agency that there is a need to evaluate the flood hazard, then the remaining guidelines apply as appropriate. (2)..... CONSIDER BOTH THE "PLAN" AND THE "CASE" APPROACHES FOR A FLOODPLAIN ABOUT TO RECEIVE A FLOOD HAZARD EVALUATION, AND SPECIFY THE CONDITIONS UNDER WHICH ONE OR THE OTHER OF THE APPROACHES IS MORE APPROPRIA TE. The "Plan" and "Case" approaches are described previously in the section title "Evaluation of Flood Hazard". Before adopting either approach for a particular area, the agency should learn what flood evaluation information is already available, which means not only what Federal agencies may have on hand but