Abstract
A stormwater runoff pollutant loading model has been developed on the basis of results from composite sampling of approximately 500 storms at nine locations in Washington State. One component of the model is an expression for total suspended solids (TSS) load in relation to traffic, runoff coefficient, and surrounding land use contributions. Other contaminants are estimated from TSS load using ratios derived from the data. These ratios may be taken as constants at any Washington State location for some pollutants or as linear functions of traffic for other pollutants. The model as presently constructed is capable of predicting loadings over a time span encompassing a number of storms (monthly or annually), but has little precision when applied to individual storms.
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