Stormwater Bmp Sizing: rain_barrel
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 (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| rain_barrel | cistern | 0 | A,B,C,D | 1 | 20 | annually | 0.5 | 0 | 0 | Cistern 500-2500 gal: provides significant volume capture. No treatment benefit. Used for irrigation reuse. | 30 | 0 | 0 | medium | 0.01 | no | 25 |
| rain_barrel | large_cistern_reuse | 0 | A,B,C,D | 0.5 | 25 | annually | 1 | 0 | 5 | Large cistern with active reuse for irrigation (1000-5000 gal). Volume reduction credit only when harvested water used. Some P reduction from reduced application. | 40 | 5 | 0 | medium | 0.015 | no | 35 |
| rain_barrel | standard | 0 | A,B,C,D | 1 | 15 | annually | 0.1 | 0 | 0 | Rain barrel 50-100 gal captures roof runoff. No water quality treatment. Peak flow and volume reduction only at site scale. Low maintenance. | 20 | 0 | 0 | low | 0.003 | no | 10 |
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