The coastal region of Myanmar normally receives more than 200 inches
(5,000 mm) of precipitation, annually (USACE, 2008). The average annual rainfall from 1961-1990 in Dawei was in the range of 5,500-6,000 mm/year which was
the zone with the highest rainfall in Myanmar. The highest rainfall recorded was 1,342 mm, occurring in August while the lowest rainfall recorded was 5 mm. occurring in December (Figure 4.1 1).