According to a report issued in 2011 on an action plan to respond to climate change by the Department of Natural Resources and Environment Thanh Hoa province, through the chain of monitoring data of the annual rainfall from 1980 to 2010 show that overall total annual rainfall on the Ma river basin in Thanh Hoa province in the last 30 years tend to be reduced, while there are many other manifestations with the usual rule for many years, during the dry season rainfall, with 100 mm of rain days occur locally. During the peak months of the hurricane season, rainfall than average shortfall so many years, especially in 2006, 2008 and 2009.
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