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 underdrain;
(B) A low flow bypass system wherever feasible;
(C) Be located at least one foot from the property line;
(D) Have three to one (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 per second;
(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.
(2007 Code, § 34-6-43)