How we are improving river health and recreation.
Storm overflows are an important part of the sewerage network and include combined sewer overflows (CSOs) and storm tank discharges. They act as a pressure relief valve when there is too much rainfall, allowing rain water, mixed with sewage, to rise inside the sewer and eventually enter a separate pipe which flows into a river or the sea. Sewers operate this way to help prevent the flooding of streets, homes and businesses. When we do need to use them, they can sometimes affect river and bathing water quality, albeit temporarily.
Many people have told us they do not like the idea of untreated sewage going into our rivers and seas, no matter how diluted. We agree. However, it will take many years to change how excess rainfall is managed, especially in our region.
The Environment Agency estimates that storm overflows lead to around 30 per cent of river and sea pollution in the North West, with water quality in the natural environment affected by rain running off highways and farm land and private drainage being incorrectly connected. We are committed to improving the water environment and working with partners like the Rivers Trust and the RSPB to tackle these issues.
We want to work with river and beach users, regulators and politicians to plan how we can reduce the need for these overflows. We will continue to work with stakeholders across our water catchment areas to set clear environmental and social objectives for improving water quality.
Our approach is very much aligned with the action plan set out in Water UK's 21st Century Rivers Report. This document calls for a new deal for rivers and for everyone — from river users and customer groups, to environmental NGOs – to work together on a new approach to restore the health and resilience of rivers as sources of habitat, life and joy.
The public sewer system has too long been the catch-all last defence for managing surface water in our communities. Better managing the flow of water and reducing its interaction with the piped sewer network is key to helping improve river quality.