- Typhoon Mirinae made landfall in Vietnam in November 2009, bringing heavy rains and strong winds that caused extensive flooding and claimed over 100 lives. - The document analyzes how development and infrastructure have exacerbated flooding risks, with dikes and barriers blocking floodways and narrowing drainage capacity. - It models how future climate change could further worsen flooding, finding flood depths may increase substantially by 2050 with sea level rise factored in. Better management of development in floodplains is needed to reduce risks.