Related Clues:

• Culvert dry? Originally, before wet weather
• Day's starting with downpour to fill this?
• Siphon
• Deplete noise, including raffia curtains
• Day's downpour and where it goes?
• Cacophony covering soldiers that run out
• Siphon off
• Exhaust water supply after day
• Nadir (anag.)
• Pipe or channel which carries off water
• D-downpour down here?
• Some plumbing finally added before shower installed
• Empty ex cathedra injunctions
• Backup site
• Many come down where excess water flows