In London, thanks to Bazalgette and the LCC's burial of its rivers and streams, culverts are a rarity and few have escaped integration into the cities sewer system. The Beverley Brook Storm Relief Culvert, aka 'Little Boys' is a short 8ft diversion horseshoe culvert constructed in 1925 after repeat flooding to the Barnes and Putney area.

Oddly enough, although the BBSRC isn't a sewer and in no way interacts with the london system, it does appear on earlier editions of the LCC sewer map until 1947 when it was removed.

(Excuse the lack of photos, a broken tripod my main excuse!)