If you've visited Cambridge, you may have noticed water running alongside Trumpington Road. This is Hobson's Conduit, an old watercourse fed by chalk springs at Nine Wells Nature Reserve just south of Cambridge (close to Addenbrooke's Hospital). The water was diverted from an old brook into man-made structures that run down into the city centre. The conduit has several branches, though much of it runs underground so you can't always see it.
Hobson's Conduit was built by a group including Thomas Hobson between 1610 and 1614, because they needed to bring fresh water to the city of Cambridge