Get rid of the drainage channel (5)
I believe the answer is:
ditch
(Other definitions for ditch that I've seen before include "Moat" , "Type of trench" , "Throw away - trench" , "Throw away (sl.)" , "Gully or furrow" .)
I believe the answer is:
ditch
(Other definitions for ditch that I've seen before include "Moat" , "Type of trench" , "Throw away - trench" , "Throw away (sl.)" , "Gully or furrow" .)