Examples of the estimated pollutant load reductions for a stormwater reuse storage system sized for the average storm event runoff volume
Link to this table
| Hydrologic Soil Group (HSG) | Watershed Area (acre) | Watershed Imperviousness (%) | Average Annual Runoff Volume Reduction1,2(%) | Average Annual TSS Reduction Reuse Only3(%) | Average Annual TP Reduction Reuse Only3(%) | Average Annual TSS Reduction NURP & Reuse3,4(%) | Average Annual TP Reduction NURP & Reuse3,4(%) |
|---|---|---|---|---|---|---|---|
| B | 10 | 10 | 21.4 | 21.4 | 21.4 | 87.4 | 60.7 |
| 30 | 26.4 | 26.4 | 26.4 | 88.2 | 63.2 | ||
| 50 | 24.0 | 24.0 | 24.0 | 87.8 | 62.0 | ||
| 70 | 21.9 | 21.9 | 21.9 | 87.5 | 61.0 | ||
| 90 | 21.3 | 21.3 | 21.3 | 87.4 | 60.7 |
1 - Based on 50-year P8 model run from January 1, 1955 through December 31, 2004 utilizing MSP climate data 2 - Assumes stormwater storage volume for reuse equivalent to the average storm event runoff volume and that the application area is sufficient to handle an irrigation application rate of 1"/week over the application area & irrigation period from May through September 3 – Assumes pollutant removal equivalent to volume reduction for reuse only 4 - Assumes average annual NURP pond removal: TP=50%, TSS=84%