Journal of Hydrologic Engineering vol:18 issue:2 pages:269-278
Contemporary sewer system operation heavily relies on urban drainage model results. In a case study near Leuven, this research investigates the potential of a cost-effective local weather radar (LAWR, DHI Water & Environment, DK) for providing rainfall input to sewer models. Before rainfall estimation is possible, the radar was calibrated using tipping bucket rain gauge measurements. Various calibration
methods were investigated, and it was found that a nonlinearly regressed power law function taking range to the radar into account is most suitable in this case study. Rainfall estimations could be slightly improved by making the calibration dependent on radar output. 57 events were simulated using the modelling software InfoWorks CS (MWH Soft Ltd., UK), and the effect of radar input on model results was investigated. Large quantitative deviations exist, but the qualitative course of time series observed
in conduits is reproduced well. Although certain events show a higher correspondence between measured and simulated time series when using radar driven input, generally the gauge driven input outperforms the former, in this case study and accompanying model.