

The network is infested with Xen wildlife, and constantly shelled by the Combine. Because of the Combine's invasion and subsequent drainage of Earth's resources, the canals near the city have almost all emptied out, with the riverbed and a large amount of waste remaining. The canals near and in City 17, connecting the urban center to a river system and dam where its water supply is pumped, appear to be heavily used as drainage, and have a very large network of sewers and waste tunnels.
