Stormwater Bmp Sizing: permeable_pavement
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 (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| permeable_pavement | full_infiltration | 74 | A,B | 1 | 20 | 0.5 | annually | 5 | 12 | 30 | 1:1 ratio (entire surface area is the BMP). Requires reservoir layer 12 in minimum. HSG A/B recommended for full infiltration. Annual vacuum sweeping required. No underdrain. | 80 | 41 | 0 | medium | 1 | no | 75 |
| permeable_pavement | permeable_interlocking_concrete | 74 | A,B,C,D | 1 | 30 | 0 | annually | 5 | 12 | 30 | PICP with underdrain or full infiltration depending on soils. 30-yr lifespan. Requires proper base/subbase compaction. Joint sand replacement needed. | 50 | 41 | 0 | medium | 1 | optional | 30 |
| permeable_pavement | porous_asphalt | 74 | A,B | 1 | 15 | 0.5 | annually | 5 | 18 | 30 | Porous asphalt surface with 18 in stone reservoir. Shorter lifespan than concrete (15 vs 20 yr). Annual vacuum sweeping critical to maintain permeability. | 80 | 41 | 0 | medium | 1 | no | 75 |
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