ABSTRACT
The impacts of urban development on local water resources generally include stormwater runoff peaks and volumes of greater magnitude than in the predeveloped state, often occurring in association with a degradation of receiv-ing-water quality. Stormwater management generally consists of collecting and transporting overland runoff in a conveyance system of storm sewers or channels that are tributary to a nearby stream or lake. Porous pavements can be designed to retain all of the rainfall and runoff with no drainage from the site or to delay runoff from the site, thus attenuating peak discharges and reducing the impact of associated pollutant transport. Runoff discharge was estimated from water levels at a 90°V-notch weir. Flow-weighted average total suspended solids concentrations observed in runoff from the conventional asphalt-concrete lot were lower than that from the porous asphalt-concrete or gravel trench lot. Average concentrations of total Kjeldahl nitrogen in the runoff from the conventional concrete lot were lower than in runoff from pervious facilities.
