Filter Strips Flow Regulation and Overflow
On-line volume based on WQv
Divert higher flows to by-pass the practice
Provide overflow spillway to ensure non-erosive condition for storms greater than WQv
Notes:
The filter strip, which receives runoff through sheet flow from impervious or pervious surfaces is most commonly designed as an on-line practice. It may be possible, through site grading and other design techniques, to provide an overflow diversion which bypasses larger flows around the facility. However, since the filter strip drainage area is limited by the flow path, the volume of high flow runoff will not generally be excessive, and there should be little need to design the system as an off-line practice.