Slide 25 of 49
Notes:
The goal of the water quality criteria is to capture and treat 90% of the average annual stormwater runoff volume. This is equivalent to the 90th percentile rainfall multiplied by the volumetric runoff coefficient and site area. This criteria strives to achieve 80% TSS removal and 40% TP removal on an annual basis (assuming appropriate treatment practices are used and constructed, designed, and maintained correctly). Higher removal rates can be obtained using a greater water quality volume or specific design features.