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23 Sep 2011 description
Executive Summary
Sector Reports

Tropical storm Ondoy (international name Ketsana) hit the Philippines on September 26, 2009, causing widespread flooding Tropical storm Ondoy was quickly followed by typhoon Pepeng (international name Parma). It initially brought powerful winds with gusts of up to 230 km/hr then an extended period of heavy rains, with cumulative rainfall amounts exceeding 1,000 mm in some areas. The resulting river floods have been estimated to have a return period of around 50 years, meaning that statistically speaking, such a rainfall event occurs on average once in every 50 years.