water course

1. A stream of water; a river or brook. Isa. xliv. 4. [ 1913 Webster ]

2. A natural channel for water; also, a canal for the conveyance of water, especially in draining lands. [ 1913 Webster ]

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. [ 1913 Webster ]