Stormwater Bmp Sizing: wet_pond
Stormwater Best Management Practice (BMP) and green infrastructure sizing criteria, pollutant removal efficiencies, and design parameters for 12 BMP types per EPA, International Stormwater BMP Database 2020, MDE, Virginia DEQ, and Minnesota Stormwater Manual
| bmp type | bmp variant | TSS removal pct (%) | applicable HSG | design storm in (in) | expected lifespan years (years) | maintenance frequency | max contributing drainage acres (acres) | media depth in (in) | nitrogen removal pct (%) | notes | peak flow reduction pct (%) | phosphorus removal pct (%) | ponding depth in (in) | relative cost index | sizing ratio bmp to drainage area (dimensionless) | underdrain required | volume reduction pct (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| wet_pond | enhanced | 90 | A,B,C,D | 1 | 50 | annually | 50 | 0 | 35 | Permanent pool volume 3x WQv with 24-hr EDT. TSS 90% maximum achievable. Aquatic bench, littoral zone, forebay required. | 70 | 60 | 0 | medium | 0.03 | no | 10 |
| wet_pond | regional | 85 | A,B,C,D | 1.5 | 50 | annually | 500 | 0 | 35 | Regional wet pond serving large drainage area. Design storm 1.5 in WQv. Higher peak flow reduction capacity. Cost-effective per acre treated. | 85 | 55 | 0 | medium | 0.01 | no | 15 |
| wet_pond | standard | 80 | A,B,C,D | 1 | 50 | annually | 50 | 0 | 30 | Permanent pool volume 2.5x design storm WQv. Average pool depth 4-6 ft. TSS 80-84% per Int'l BMP Database 2020. TP 50% median. Minimal volume reduction (no infiltration). | 65 | 50 | 0 | medium | 0.03 | no | 10 |
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