The need for high resolution precipitation data to improve urban drainage modelling

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Published Date

31-12-2015

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Source:

Proceedings of the 10th International Urban Drainage Modelling Conference, UMD 2015, Montreal (Canada), Sept. 20-23, 2015

Faculty

Civil Engineering and Geosciences

Department

Water Management

Abstract

In this study high resolution precipitation data are used, derived from polarimetric X-band radar at 100 m, 1 min resolution. The data are used to study the impact of different space-time resolutions of rainfall input on urban hydrodynamic modelling response for 9 storms, in 7 urban catchments. The results show that hydrodynamic response behaviour was highly sensitive to variations in rainfall space-time resolution, more strongly so for changes in temporal than in spatial resolution. Under- and overestimations of flow peaks amounted to up to 100% with respect to the original 100 m, 1 minute rainfall input.

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