1. a natural or artificial channel through which water flows, such as a river, stream, or canal
2. the bed or path along which water flows or has flowed

Examples

• The ancient watercourse carved a deep valley through the mountains.
• Engineers diverted the watercourse to prevent flooding in the town.
• The dry watercourse showed evidence of seasonal flooding.
• Fish swam upstream along the natural watercourse.
• The irrigation system included several artificial watercourses.
• Erosion had widened the watercourse over many years.
• The map clearly marked every major watercourse in the region.