A culvert that travels under much of St Helens with a dirty big sewer overflow at one end.

A set of stairs drops down from a small dry RCP and joins after the outfall, the whole setup looking like a 'Y' from above.

STD starts off with a long old stoop through Corrugated Metal Pipe.

A balancer between the A and B Outfall sewers with penstocks to enable throttling between pipes.

The brook emerged from a tiny brick culvert around a foot high, but downstream a few meters was the outfall for what I presume to be the brook's bypass.

Prestwich clough had a promising looking if not slightly dodgy culvert. The brick filled wire cages sagged rather in the middle and the concrete roof beams looked compromised from the weight above.