The southern route of the Ring Main extension crosses the River Effra. How will the works effect the river and will the risk of flooding increase?
The River Effra is a covered river which forms part of the south London drainage system. It rises near Crystal Palace and passes through Norwood, Dulwich, Herne Hill, Brockwell Park, Brixton and Kennington before discharging into the River Thames by Vauxhall Bridge. The tunnelling works will be approximately 40m (or 130 ft) below ground level as they cross below the River Effra Storm Relief Sewer. Our engineers are aware of the river and confirm sufficient vertical separation between the culverted section of the river and the tunnel. The works will not effect the river or increase the risk of surface water flooding. The original Ring Main crosses under the River Thames eight times.
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