Captain Birdeye's Flo Selecta is a storm relief culvert for the Markeaton Brook in Derby.
A main overflow for the Work 6 Sewer with a dose of big scale Manchester brick.
The River Westbourne rises in Hampstead Heath and was incorporated in Bazalgette's sewerage system as the 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.