Stormwater Bmp Sizing: underground_detention
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 (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| underground_detention | closed_bottom | 20 | A,B,C,D | 1 | 30 | annually | 50 | 0 | 5 | Closed bottom system: no infiltration. Peak flow control only. TSS removal via settling in large chambers. Requires outlet structure. | 70 | 10 | 0 | very_high | 0.02 | no | 10 |
| underground_detention | modular_arch | 20 | A,B,C,D | 1 | 30 | annually | 100 | 0 | 5 | Large modular arch underground detention. No WQ treatment. Peak flow attenuation only. Very high cost. | 80 | 10 | 0 | very_high | 0.02 | no | 10 |
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