Abstract
This paper decribes the selection of rainfall data for design of detention basins. The use of design storms (the uniform intensity design storm, the Chicago design storm and the Sifalda design storm) were compared with the use of historical storms where the historical storms were assumed to give the most correct result. Historical storms were selected from an 18-year rainfall record and local coefficients were estimated from the same record. Three test catchments were used and detention basins were located at the outlet of each basin. For the runoff simulations were used the CTH-Urban Runoff Model which also includes a detention basin submodel. The results show the importance of the design storms having total volumes that correspond to the volumes of the historical storms. The use of the uniform intensity design storm and the Chicago design storm resulted in underestimated detention basin volumes. The Sifalda design storm caused overestimated basin volumes which can be reduced after an improvement of the storm.
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