Lyndon Johnson actually said...
All executive agencies directly responsible for the construction of Federal buildings, structures, roads, or other facilities shall evaluate flood hazards when planning the location of new facilities and, as far as practicable, shall preclude the uneconomic, hazardous, or unnecessary use of flood plains in connection with such facilities.
Context
Executive Order 11296—Evaluation of Flood Hazard in Locating Federally Owned or Financed Buildings, Roads, and Other...
08/09/1966