A drainage channel is a type of waterway that is used to direct the flow of water away from an area. The two crossword solutions for this term are 'GUTTER' and 'DITCH'. A GUTTER is a shallow trough or channel that is typically found along the edge of a roof, and is used to collect and divert rainwater away from the building. A DITCH is a long, narrow trench that is dug into the ground and is used to carry water away from an area.