LIST Hydrographic Area depicts all waterbody and associated polygon features in the hydrographic theme including lakes, estuaries, dams, mudflats, swamps and coastal flats. It contains attributes that allow area features to be delivered in separate layers and with attributes. The data set is held as regions which allow area features to overlap.
Hydrological barrier is topologically consistent feature in hydrological network. Hydrological Crossing points are critical in the identification of obstructions, diversion and storage water for the hydrological enforcement of elevation models
