Media playback is unsupported on your device

How would the 'super sewer' be built?

12 September 2013 Last updated at 16:21 BST

Planning officials have started looking into proposals to build a so-called "super sewer" under London.

The Thames Tideway Tunnel would create one of the world's largest sewerage networks and is designed to prevent discharges of effluent into the river Thames.

But there is strong opposition to the scheme, which would cost over £4bn and take a decade to build. Tom Bateman reports.

Most watched

Copyright © 2015 BBC. The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.