Storm overflow guidance

Classify storm overflow performance GN066

Guidance explaining how storm overflows (both permitted and unpermitted) should be classified. The classification will be used to plan and prioritise improvements to bring all storm overflows up to satisfactory status. It includes relevant definitions, storm overflow classification criteria and how to assess storm overflow performance.

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Apply for an environmental permit for an unpermitted storm overflow GN021

Guidance (primarily for water companies) explaining the steps you should take to apply for an environmental permit for an unpermitted storm overflow. The requirements may depend on the agreed storm overflow classification. This guidance should be used in conjunction with NRW guidance (GN066 –  How to classify storm overflow performance)

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