I’m sure that Lancaster has more than one type of manhole cover, but this is the only picture I have.

On a related note: As an old city (by American standards), Lancaster has a a combined sewer system and a stormwater overflow problem it is trying to solve with residents’ help.  This short video highlights the city’s efforts to implement green infrastructure– green roofs, porous pavements, expanded tree canopy, and the like: http://www.saveitlancaster.com/whats-new/

Photo credit: ATS