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(%)|
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%.