The assessment of the effectiveness of Flood Probability Reduction Measures such as Sustainable Drainage Systems (SUDS) is not systematically verified and their practice is not well established yet. The objective of this paper is to quantify and model the hydrologic effects of combined SUDS elements on the catchment level of urban areas at extreme storm events with a new integrative method. The theoretical concept aims at high level of physical soundness and level of detail, but spatial aggregation and data processing in the model are necessary to enhance the flexibility for spatial planning tasks for studying different scenarios of urban developments. The concept has been implemented in a semi-distributed rainfall runoff model and the application is demonstrated with scenario studies.
