Stormwater Bmp Sizing: sand_filter
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 (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| sand_filter | perimeter | 80 | A,B,C,D | 1 | 20 | 0 | twice_yearly | 3 | 18 | 25 | Perimeter sand filter: sediment chamber + filter chamber. 18 in filter media. Effective in ultra-urban applications with limited land area. | 55 | 45 | 12 | high | 0.02 | yes | 25 |
| sand_filter | surface | 85 | A,B,C,D | 1 | 20 | 0 | twice_yearly | 5 | 18 | 30 | Surface sand filter: 12-18 in sand layer. WQv treated in two-chamber system. TSS 85%, TP 50% per International BMP Database 2020. Requires regular inspection. | 60 | 50 | 0 | high | 0.02 | yes | 30 |
| sand_filter | underground_vault | 85 | A,B,C,D | 1 | 20 | 0 | twice_yearly | 2 | 24 | 30 | Underground sand filter vault for ultra-urban sites. Two-chamber pretreatment + filter. Requires vacuum truck maintenance. | 60 | 50 | 12 | very_high | 0.015 | yes | 30 |
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