Stormwater quality processes for three land-use areas in Broward County, Florida

Systematic collection of rainfall, runoff, and water-quality samples from three small urban areas of Broward County, Florida, were obtained between 1974 and 1977. Stormwater loads for 30 or more storms were computed for the residential, highway, and commercial investigation areas.

Stepwise, multiple, linear regression models were constructed for total nitrogen, total phosphorus, total carbon, chemical oxygen demand, total residue, lead, and zinc. Loadings, pounds per day per acre of hydraulically effective impervious area, were computed based on measured, modeled, and estimated loads for the three areas.

Atmospheric loads were estimated from chemical analyses of bulk precipitation collected at the highway and commercial sites. The atmospheric contribution to the runoff loads were 49 percent or more for all seven constituents at the two sites.