In the Netherlands new regulations regarding combined sewer overflows have been proposed to reduce the pollution of surface water. These regulations will lead to the construction of ancillary sewer facilities. The current design methods are not suitable for optimizing measures to control overflow loads. Therefore a new method, called ‘Dynamic Design', is proposed. This design method is based upon the use of time series of rainfall and advanced computer programs. By using longterm continuous simulation in combination with historical time series of rainfall overflow volumes, discharge durations and frequencies can be derived. These results can be analysed statistically to obtain frequency distributions of overflow volumes and discharge flows. This procedure ensures not only the assessment of detention tanks but also the evaluation of alternative measures like real time control and flow routing strategies. Dynamic design aims at the efficient use of ancillary sewer facilities to minimise receiving water impact. Several cases are discussed to show the advantages of dynamic design in comparison with current design procedures.

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