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%
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This page was last modified on 9 September 2013, at 10:54.

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