Large RPG Cities, just like Rome or Paris, have sewer systems for the primary purpose of drainage, to keep their streets from flooding. the Sewers channel storm water away from the city.
Whether your RPG campaign is set in Balder's Gate, Calimport or Waterdeep in the Forgotten Realms; Beneath the sprawling streets of Ravnica, or in the underground canals of Sigil in the outer planes, your adventures... [click here for more]