Stormwater Bmp Sizing: constructed_wetland
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 (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| constructed_wetland | pond_wetland_system | 80 | A,B,C,D | 1 | 30 | twice_yearly | 50 | 0 | 38 | Combined wet pond (forebay) and wetland marsh. Higher performance than shallow marsh alone. | 65 | 48 | 0 | medium | 0.03 | no | 15 |
| constructed_wetland | shallow_marsh | 73 | A,B,C,D | 1 | 30 | twice_yearly | 50 | 0 | 30 | Shallow water zone 6-18 in depth (85% of surface area). Emergent vegetation essential. TSS 73% median per International BMP Database 2020. TP 38% per MN Stormwater Manual. | 60 | 38 | 0 | medium | 0.03 | no | 15 |
| constructed_wetland | treatment_train | 85 | A,B,C,D | 1 | 30 | twice_yearly | 50 | 0 | 40 | Constructed wetland preceded by wet pond forebay. Enhanced performance. Forebay pre-settles coarse particles. | 65 | 55 | 0 | high | 0.025 | no | 20 |
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