Evaluation of sediment control pond performance at construction sites in the Greater Toronto Area
Receiving water quality concerns associated with increased construction activities in recent years in the Greater Toronto Area has prompted the Toronto and Region Conservation Authority (TRCA) to evaluate design criteria for sediment control ponds employed during the construction period. Stormwater management ponds located in Richmond Hill and Markham were monitored to obtain stormwater runoff quantity and influent/effluent quality data during site development. The ponds were designed and constructed in accordance with the Ontario Stormwater Management Planning and Design Manual for an enhanced level of protection (i.e., 80% TSS removal). A detailed hydrodynamic and sediment transport finite element model was used to examine the effect of various pond design parameters on sediment removal efficiency under varying meteorological events. The monitoring data and the numerical simulation results clearly demonstrate the importance of proper pond size and geometry design. This thesis focuses on the effect of pond design parameters in improvement of sediment removal efficiency of stormwater management ponds. The results of this study will be useful in updating the design criteria for stormwater management ponds.