The article presents expected influence of constructing Czyżkówko dam, planned to raise water of the river Brda in Bydgoszcz, on operational conditions of the system draining adjacent area. Using EPA's Storm Water Management Model a dynamic runoff model has been built for Piaski housing estate with the use of the available rain gage data. The paper gives a short theoretical basis for various component models (infiltration, evaporation, conduit and groundwater flow) and the conclusions from the operational analysis of the networked drainage system during a heavy rain. It also presents some aspects of using such dynamic rainfall-runoff model for inspecting and designing an urban drainage system.
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