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Storm overflow assessment framework

Storm overflows are an important part of our drainage system. They are designed to provide protection to properties from flooding by acting as a ‘safety valve’ when there is too much rain water for the drainage system to cope with.

Significant investment by the water industry over recent decades has reduced the impact of storm overflows on the environment, and a major programme to improve the monitoring of storm overflows is underway, for completion in 2020.

The UK Water industry has worked in partnership with our regulators and with MWH, CH2M, PJM Economics and EcoFutures to develop a framework for valuing the benefits of further improvements to storm overflows. There is a full report, and a practitioners’ guide.

This forms part of the new Storm Overflow Assessment Framework for use as companies consider their investment programmes beyond 2020.