14.7 BMP T809 - Large Sand Filter

14.7.1 Design Criteria for Large Sand Filters

Comply with Section 14.4 Design Criteria for All Sand Filtration BMPs and Section 14.5 Construction Criteria for All Sand Filtration BMPs except:

Large sand filters shall be sized to capture and treat 95% of the total runoff volume.

Large sand filter underdrains and overflows shall be designed by increasing the 2-year return period flowrate by the ratio of the 95% runoff volume and the 91% runoff volume.