With 189 water basins and an average rainfall of over 2000-4000 mm per year , Malaysia is prone to riverine , muddy floods that range from hours-long flash floods , to prolonged flooding on flat , low-lying land along major tributaries and main stems . There have been 15 instances of major flooding in Malaysia since 1926 . Flooding has been a major concern in recent decades due to rapid development in river catchment areas that has led to increased surface and river runoffs , increased sediment buildup in rivers , and a higher risk of overflowing rivers . The 2006 and 2007 floods in Johor has resulted in loss of RM 1.5 billion and 18 lives in addition to the temporary displacement of 110,000 people
2006 and 2007 floods
2006–07 Southeast Asian floods
Geography of Malaysia