A linear obstacle built perpendicular to a river to guild and direct water to the river water inlet for irrigation ditch.
- Project: Ksôkong Tsùn Irrigation System, Taiwan
- Climate: Tropical savanna climate with dry-winter characteristics
- Year: 1839
- Water type: river water
- Landscape type: river plain
- Altitude: 0-20 m.a.s.l. (meters above sea level)
- Soil condition: alluvial soil
- Materials: bamboo, excavated earth
- Period: proximity from every October until next July (re-built every October during the dry season and got flooded away during typhoon season.)
- Form: Point
- Use or Function: Direction