What is "water course"

Water course \Wa"ter course`\

1. A stream of water; a river or brook.
   --Isa. xliv. 4.

2. A natural channel for water; also, a canal for the conveyance of water, especially in draining lands.

3. (Law) A running stream of water having a bed and banks; the easement one may have in the flowing of such a stream in its accustomed course. A water course may be sometimes dry.
   --Angell.
   --Burrill.