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River flooding, especially flash floods, are a serious and frequent problem in Samoa and in particular Apia where steep catchments with rapid flood onsets are subject to frequent heavy rainfall events. The April 2001 flood event inundated large parts of Apia urban area within a negligible time lag from the beginning of the intense rainfall. The surrounding watersheds responded to the flash floods with combined overbank/overland flow. Approximately 5,000 local residents were directly affected by the flood and resulting damages were estimated in excess of WST$ 11 million. Such events are not rare for Samoa.

River flooding, especially flash floods, are a serious and frequent problem in Samoa and in particular Apia where steep catchments with rapid flood onsets are subject to frequent heavy rainfall events. The April 2001 flood event inundated large parts of Apia urban area within a negligible time lag from the beginning of the intense rainfall. The surrounding watersheds responded to the flash floods with combined overbank/overland flow. Approximately 5,000 local residents were directly affected by the flood and resulting damages were estimated in excess of WST$ 11 million. Such events are not rare for Samoa.