Modelling Roof runoff in a Small Urban Catchment

Australian Engineers Association
Publication Type:
Conference Proceeding
Proceedings of Water Down Under 2008, 2008, pp. 398 - 408
Issue Date:
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The conventional approach to modelling urban stormwater runoff Is to view the different impervious surfaces in a catchment as having the same characteristics and producing similar responses to rainfall during storm events. However, consideration of the literature shows that differences exist between these individual surfaces, as evident In the variation of pollutant loads coming off the impervious surfaces within a catchment such as roads and roofs, Relativeiy few studies have been undertaken to model roof runoff exclusively. This research, therefore, focuses on the simulation of roof runoff using a hydrologic model based on kinematic wave theory to differentiate and compare the runoff processes taking place on a roof surface to its road counterpart. A field monitoring station has been established adjacent to a roof catchment so that sufficient hydrologic data can be obtained during storm events for model calibration and validation. Initial testing revealed that the model performs satisfactorily and provides predictions well within the acceptable accuracy. This roof runoff model will form the basis for the development of a model that will simulate roof runoff quality. Results from this study are useful in view of the implementation of Water Sensitive Urban Design (WSUD) concepts in urban stormwater management through enabling better estimation of the catchment contaminant loads from different urban catchment surfaces.
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