6.6.3 Dry extended detention basin
A dry extended detention basin is an earthen structure constructed either by impoundment of a natural depression or excavation of existing soil, that provides temporary storage of runoff and functions hydraulically to attenuate stormwater runoff peaks. The dry detention basin, as constructed in countless locations since the mid-1970’s and representing the primary BMP measure until now, has served to control the peak rate of runoff, although some water quality benefit accrued by settlement of the larger particulate fraction of suspended solids. This extended version is intended to enhance this mechanism in order to maximize water quality benefits.
Structural BMPs
- Volume/Peak Rate Reduction by Infiltration BMPs
- 6.4.1 Pervious pavement with infiltration bed
- 6.4.2 Infiltration Basin
- 6.4.3 Subsurface Infiltration bed
- 6.4.4 Infiltration trench
- 6.4.5 Rain Garden/bioretention
- 6.4.6 Dry well/seepage pit
- 6.4.7 Constructed filter
- 6.4.8 Vegetated swale
- 6.4.9 Vegetated Filter strip
- 6.4.10 Infiltration berm & retentive grading
- Volume Peak Rate Reduction BMPs
- Runoff Quality/Peak Rate BMPs
- Restoration BMPs
- Other BMPs and related Structural Measures