Performance Analysis of Urban Runoff Quality Control Ponds By Continuous Simulation.
Continuous simulation models are developed to characterize the performance of four types of stormwater quality control ponds: retention basins (infiltration facilities), extended detention ponds, sedimentation ponds with displacement, and wet settling ponds/tanks. The performances of these stormwater quality control facilities are modelled under different design and operating conditions. The long term pollutant removal and average annual pollutant loading from the pond systems are used as the performance criteria. Effects of design storm volume and duration, catchment location, land use, configuration of the basin, operation policy, outflow rate, detention time, and type of pollutant on the performance of these facilities are examined. It is demonstrated that the design storm volume and duration requirements, as specified in the MOE/MNR Interim Stormwater Quality Control Guidelines, are not sufficient to properly design the stormwater quality control facilities. According to the Guidelines, the same facility may be either over designed or provide insufficient stormwater quality control depending on local climatic and catchment conditions. Recommendations for the design of urban runoff quality control ponds are made on the basis of the simulation analyses.
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