International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage
8843. Kanat, Foggara, Karez (used in Baluchistan), Rhettara (used in Morocco), or Qanat (used in Iran) : Subsurface gallery for water supply starting from below the water table and sloping downwards to the ground surface with a gradient flatter than both the water table and the ground surface. | ||