Lyndon Johnson actually said...
The heads of the executive agencies shall provide leadership in encouraging a broad and unified effort to prevent uneconomic uses and development of the Nation's flood plains and, in particular, to lessen the risk of flood losses in connection with Federal lands and installations and federally financed or supported improvements.
Context
Executive Order 11296—Evaluation of Flood Hazard in Locating Federally Owned or Financed Buildings, Roads, and Other...
08/09/1966