(A)   Other agencies have criteria and regulations pertaining to drainage systems which may complement this criteria.
   (B)   When conflicts are encountered the most rigorous criteria shall govern.
      (1)   Federal Insurance Agency: Floodplain Regulations and Implementing Ordinances Adopted by Municipalities drainage systems designed within the limits of the designated 100-year floodplain on the principal stream shall be designed to convey the flood as defined by applicable published floodplain information studies. For areas located in FIA Zone “A” outside the detailed study area, the developer shall prepare studies and calculations establishing the floodplain, elevation and width. These calculations shall be submitted to the reviewing agency for approval.
      (2)   Illinois Department of Water Resources, Rules and Regulations of Dams and Reservoirs shall apply to those structures classified as dams thereunder.
(1999 Code, § 34-5-61)