Related Clues:

• Exhaust - pipe
• Exhaust (of liquid)
• Sewer
• Waste channel
• Gutter
• Hole in a bathtub
• One may be snaked
• Place for clogs
• Sink hole
• To empty (of fluid)
• Something using up resources
• Wasted down here — that could be nadir
• Discharge pipe
• Waste channel/pipe
• Culvert dry? Originally, before wet weather