Abstract
The effect of introducing rainwater collection in an urban residential area dominated by detached houses is investigated using the MOUSE/SAMBA modeling concept and historical rain series as input. The effect on the mean annual CSO volume is analyzed and compared to the effect of a detention basin for a wide range of catchment characteristics. Although achieving a certain reduction of mean annual CSO volume requires a smaller storage volume using a detention basin than using rainwater collection tanks, several factors affect the comparison significantly. Variations in the interceptor capacity, the existing storage volume within the catchment and the time of concentration for the catchment obviously affect the absolute CSO volumes. However, these factors also change the relative efficiency of rainwater collection tanks and downstream detention basins. Depending on the catchment characteristics, the total volume of rainwater tanks needs to be 3–40 times larger than the volume of a downstream detention basin to obtain the same reduction of mean annual CSO volumes. This large difference mainly appears because the rainwater collection tanks are partially filled with water during very long periods, thus preventing the full tank volume from actively alleviating peak flows.
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