Detention basins shall be designed to enhance water quality.
(A) Length to width ratio. All detention basins shall have a length to width ratio of at least three to one (3:1) as measured along the longitudinal axis of flow.
(B) Inlet and outlet orientation. As much as feasible, the distance between inlets to, and outlet from any detention basin should be maximized. If possible, the inlets and outlet should be at opposite ends of the basin.
(C) Velocity dissipation. Baffles or berms should be placed perpendicular to the direction of flow through a detention basin to reduce velocity and prevent scour.
(D) Maintenance. The storm water drainage system shall be designed to minimize and facilitate maintenance. Turfed side slopes should be designed to allow lawn-mowing equipment to easily negotiate them. Wet basins should be provided with alternate outflows which can be used to completely drain the pool for sediment removal. Pre-sedimentation basins should be considered for localizing sediment deposition and removal. Access for heavy equipment should be provided.
(Ord. 801, passed 7-26-05) Penalty, see § 154.99