Looming over the mouth of the Koronoo River that flows into the harbor, the Waterworks are a mix of ancient sewerage and more recent pipes, the largest of which dumps effluent into the harbor. Behind the pipes and steam vents stand sealed iron doors, which lead into the kobold-infested sewers.
The giants built everything big, and the vaulted sewer system is no exception. As one travels deeper and deeper into it, it gets older and, eventually, ties into the buried buildings of the old city. The deepest tunnels are home to things more dangerous, and more disturbing, than kobolds.