10.4122/1.1000001304 Kr\303\244mer, S. Verworn, H.-R. Ziegler, J. Radar rainfall time series for the performance assessment of sewer systems DTU Library, Technical University of Denmark (DTU) 2005 Performance assessment radar rainfall rain gauge sewer systems time series University of Hanover, Institute of Water Resources Management en Conference full text 10.4122/1.1000001303 application/pdf 1 The performance assessment of sewer systems using historic rainfall time series as input to rainfall runoff models has become an established practice. The generally used uniformly dis-tributed rainfall does not take into account the effects of spatial variations in the rainfall pat-terns but is believed to result in rather higher than lower runoff results. The use of distributed rainfall is desirable, but only now are the time series of radar data starting to get long enough, whereas the otherwise necessary long parallel time series of neighbouring stations are not available in most cases. For this investigation rainfall data from a network of ground gauges as well as from a weather radar have been available for a period of nearly seven years. With a series of 33 relevant events rainfall runoff simulations were carried out using three different types of rainfall information: uniform rainfall using one rain gauge, distributed rainfall from seven gauges and radar rainfall. For the assessment the calculated areal rainfalls were used as well as the resulting numbers of surcharged manholes and surcharges per manhole. It is clearly demonstrated that carefully processed radar data can substitute the rain gauge time se-ries.