Evaluation of effectiveness of combined sewer overflow control measures by operational data

摘要

The effect of combined sewer overflow (CSO) control measures should be validated duringnoperation based on monitoring of CSO activity and subsequent comparison with (legal)nrequirements. However, most CSO monitoring programs have been started only recently andntherefore no long-term data is available for reliable efficiency control. A method is proposed thatnfocuses on rainfall data for evaluating the effectiveness of CSO control measures. It is applicable ifna sufficient time-series of rainfall data and a limited set of data on CSO discharges are available.nThe method is demonstrated for four catchments of the Berlin combined sewer system. Thenanalysis of the 2000–2007 data shows the effect of CSO control measures, such as activation ofnin-pipe storage capacities within the Berlin system. The catchment, where measures are fullynimplemented shows less than 40% of the CSO activity of those catchments, where measures havennot yet or not yet completely been realised.