Abstract
The costs of setting up and running a storm water management model are largely determined by the level of discretization used for a particular catchment. This study investigates the level of discretization needed to adequately represent an urban watershed and to illustrate the effects of reducing the number of subcatchments on the accuracy of runoff simulation. A methodology is defined to achieve a representative equivalent catchment from theorectical considerations. Verification of the procedures involved a series of applications on both hypothetical and real areas. The simulation results of the simplified (coarse) discretization are compared with those of the detailed (fine) discretization of the same rainfall storms. The accuracy of the simulation is maintained by careful aggregation of the subcatchment parameters and the proper selection of the aggregated hydraulic width.
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