Stormwater Bmp Sizing: infiltration_basin
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) | infiltration rate in per hr min (in/hr) | 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 (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| infiltration_basin | bioinfiltration | 95 | A,B | 1 | 20 | 1 | twice_yearly | 2 | 24 | 65 | Bioinfiltration cell: bioretention design with no underdrain, full volume infiltration. Maximum performance all pollutants. | 90 | 80 | 6 | high | 0.05 | no | 95 |
| infiltration_basin | dry_well | 90 | A,B | 1 | 20 | 2 | annually | 0.1 | 0 | 60 | Vertical drywells/infiltration galleries. High infiltration rate soils essential. Volume reduction 90%+. No peak flow attenuation benefit. Point source only. | 90 | 75 | 24 | low | 0.001 | no | 90 |
| infiltration_basin | standard | 90 | A,B | 1 | 25 | 1 | annually | 10 | 0 | 60 | Ponding area sized to infiltrate 1 in design storm within 72 hr. Requires native infiltration rate >= 0.5 in/hr. 100% removal for infiltrated fraction. EPA SWBMP Manual Sec.5. | 80 | 75 | 0 | medium | 0.03 | no | 85 |
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