Storage channel on the Seseke Cycle Path

A storage sewer, also known as a rainwater retention sewer, is the name given to sewerage structures of drainage systems in which the water that arrives during heavy rainfall is first dammed up and only released into the downstream sewage system in a throttled manner.[1] A storage space duct is therefore a collecting duct with a larger cross section.

Why is this a highlight for me as a cyclist?
OK. It serves a purpose. But so do bus stops, mailboxes, ATMs... 🤔

Banalities highlight like a bus stop. A highlight is something "special, a highlight on a bike tour. If the storage channel was THE special thing on your tour "ohha" A storage channel is a technical everyday thing, at every Köttelbecke or Köttelbach or river, not just in the Ruhr area, like the drain on the street.