Captain Birdeye's Flo Selecta is a storm relief culvert for the Markeaton Brook in Derby.

The River Westbourne rises in Hampstead Heath and was incorporated in Bazalgette's sewerage system as the Ranelagh Sewer.

The Egg is a Victorian storm relief sewer that serves both the River Tyburn (KSP sewer) and the Westbourne (Ranelagh sewer).

Averaging around 5 1/2ft, this brick and concrete drain appears to act as a relief sewer.

This large box shaped CSO tank serves a 5ft sewer and outfalls to the Medlock in the East of Manchester.

One of the many culverts that makes up the Hockley Brook as it travels under Birmingham.

A look at some of the outfalls after a storm near Ringley treatment works.