Area equipped for irrigation drained

Irrigated area where drainage is used as an instrument to control salinity, pounding and waterlogging. This refers mainly to the area equipped for surface irrigation and to the equipped lowlands. Areas equipped for sprinkler irrigation and for localized irrigation do not really need a complete drainage system, except perhaps some small structures to evacuate the water in case there might be heavy rainfall. Flood recession cropping areas are not considered as being drained.