Stormwater Bmp Sizing: dry_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 (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| dry_detention | enhanced_extended_detention | 65 | A,B,C,D | 1 | 30 | annually | 50 | 0 | 20 | 40-hr EDT design. TSS 65% per Maryland ESD manual level-2. Enhanced settling with micropool. | 75 | 30 | 18 | low | 0.02 | no | 20 |
| dry_detention | extended_detention | 50 | A,B,C,D | 1 | 30 | annually | 50 | 0 | 15 | Sized for 24-hr extended detention of WQv (1 in design storm). TSS 50% for 24-hr EDT per NJ BMP Manual 2004. Minimal P removal. Primarily peak flow control. | 70 | 20 | 12 | low | 0.02 | no | 15 |
| dry_detention | micropool_extended_detention | 70 | A,B,C,D | 0.75 | 30 | annually | 50 | 0 | 25 | Micropool EDT pond. Permanent pool 1-10% of total pool volume prevents re-suspension. Improved TSS performance 70% vs standard EDT 50%. | 75 | 35 | 18 | low | 0.02 | no | 20 |
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