Abstract:
Various stormwater models have been employed to simulate runoff quality on urban catchments. Yet, it was found that they were unable to reproduce the historical pollutographs or loadographs accurately and reliably. This can be attributed to the fact that runoff quality processes such as the entrainment and erosion mechanisms of pollutants from surfaces are poorly understood. As a result, either simple conceptual models or empirical expressions that require extensive calibration were used instead. To attain better prediction of sediment loads and pollutant constituents, the variable runoff depth on the catchment surface has to be accounted for and the hydrological processes taking place ought to be replicated by the model. This is possible by adopting the kinematic wave approach in routing runoff over the surfaces.
