§ 152.157 DETENTION POND DESIGN CRITERIA.
   A detention pond shall be defined as an area designated to store excess run-off temporarily with no permanent pool and shall incorporate the following design criteria:
   (A)   A minimum 2% bottom slope or implementation of a low flow system or under-drain;
   (B)   A low flow by-pass system wherever feasible;
   (C)   Be located at least one foot from the property line;
   (D)   Have 3:1 or flatter side slopes;
   (E)   Provide a minimum of two feet of freeboard or 50% of the maximum pond depth, whichever is less;
   (F)   Energy dissipation and/or erosion control for areas where velocities meet or exceed six feet/sec;
   (G)   Emergency overflow designed to pass the peak inflow which would occur in a 100-year storm;
   (H)   Landscaping and multiple use shall be considered in all pond designs;
   (I)   Subdivision detention ponds shall be incorporated into multiple properties to encourage maintenance or shall incorporate recreational use and be the responsibility of the home owner's association;
   (J)   Provisions shall be provided to allow ease of clearing outlet structures;
   (K)   Flows from ponds shall be deposited directly into an approved storm sewer system where available; and
   (L)   Facilities adjacent to a state highway may design for all flows entering the highway system on IDOT standards for storm water run-off.
(2001 Code, § 34-6-43)