The use of continuous long term simulations for the design and impact assessment of source control measures

摘要

Since the new Flemish guidelines for urban drainage were introduced in 1996 [1], more emphasis has been put on source control measures in order to reduce the peak runoff from urban areas during wet weather conditions. The keyword is 'disconnecting' impervious areas from the combined sewer system. This involves the construction of upstream storage and infiltration facilities, rain-water tanks for reuse in households and the revaluation of ditches [2,3]. However, one must realise that the runoff discharges from the 'disconnected' areas still have to be taken into account, because during heavy rainfall periods not all rain-water can be stored locally. Therefore, urban runoff plans with respect to extreme events and flooding risks are very important.