Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Control of Urban Runoff Stormwater Discharge to Receiving Waters Using Off-Line Storage
5. Conclusions This research allowed the estimation of the efficacy of sewer overflows, coupled with off-line storage basins, in the control of negative impacts of urban stormwater runoff on receiving waters. The number of discharges, their volume and the suspended solids load discharged into receiving waters without treatment were evaluated through continuous simulation over the period of one year, using a global model calibrated with measured quantity and quality data. The results obtained show that the use of sewer overflows only is inadequate, while sewer overflows coupled with storage basins permit high reduction of the pollutant loads discharged into receiving waters, of pollutant concentrations in the discharges, and to a lesser degree, of the number of discharges. It was verified that, in a storm sewer system, the use of a sewer overflow, with a flow limit equal to 1–1.5 l/s per effective hectare, as recommended for Italy, coupled with an off-line storage basin with a volume equal to 50 m3 per effective hectare, permits a suspended solids load reduction of approximately 80%. In any case, the employment of larger storage basins is not efficient, because the efficacy increase is very small compared to the increase in costs. The results are obviously influenced by the simplifications of the catchment topography in the model, by the values assigned to the model parameters and by the specific distribution of storm events in the simulated year. In particular, the results obtained for various values of the retention constant, k, could be influenced by the use of a global model and by the assumption of instantaneous mixing, which is more realistic in small catchments, than in larger catchments with a complex urban topology.
Control of Urban Runoff Stormwater Discharge to Receiving Waters Using Off-Line Storage
5. Conclusions This research allowed the estimation of the efficacy of sewer overflows, coupled with off-line storage basins, in the control of negative impacts of urban stormwater runoff on receiving waters. The number of discharges, their volume and the suspended solids load discharged into receiving waters without treatment were evaluated through continuous simulation over the period of one year, using a global model calibrated with measured quantity and quality data. The results obtained show that the use of sewer overflows only is inadequate, while sewer overflows coupled with storage basins permit high reduction of the pollutant loads discharged into receiving waters, of pollutant concentrations in the discharges, and to a lesser degree, of the number of discharges. It was verified that, in a storm sewer system, the use of a sewer overflow, with a flow limit equal to 1–1.5 l/s per effective hectare, as recommended for Italy, coupled with an off-line storage basin with a volume equal to 50 m3 per effective hectare, permits a suspended solids load reduction of approximately 80%. In any case, the employment of larger storage basins is not efficient, because the efficacy increase is very small compared to the increase in costs. The results are obviously influenced by the simplifications of the catchment topography in the model, by the values assigned to the model parameters and by the specific distribution of storm events in the simulated year. In particular, the results obtained for various values of the retention constant, k, could be influenced by the use of a global model and by the assumption of instantaneous mixing, which is more realistic in small catchments, than in larger catchments with a complex urban topology.
Control of Urban Runoff Stormwater Discharge to Receiving Waters Using Off-Line Storage
Bornatici, L. (Autor:in) / Ciaponi, C. (Autor:in) / Papiri, S. (Autor:in)
01.01.2004
12 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Chemical Oxygen Demand , Suspended Solid , Total Suspended Solid , Storm Event , Suspended Solid Concentration Environment , Environmental Management , Geoengineering, Foundations, Hydraulics , Environmental Monitoring/Analysis , Ecotoxicology , Nature Conservation , Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution
Control of Urban Runoff Stormwater Discharge to receiving Waters Using Off-Line Storage
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