Flood monitoring
Orange River flood
HighOrange–Senqu catchment · Northern Cape · Jan 2011
Flood extent
741 km²
74 100 hectares
Normal water extent
132 km²
Settlements affected
31
Modelled from settlement footprints
People affected (est.)
76 000
Before / after comparison
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At peak, inundation covered 741 km² — roughly 5.6× the normal water extent for this reach.
Event summary
Upper-catchment saturation drove a long-duration flood wave through the lower Orange irrigation corridor.
Extent derived from Sentinel-1 SAR water/non-water classification; settlement counts are modelled estimates for decision support, not verified damage assessments.