A flash flood is typically caused by sudden, excessive rainfall that sends a river, stream or other body of water rapidly out of its banks. Often this occurs in a short amount of time, only several hours or even less. It came by surprise and also wrought havoc in many areas after a heavy downpour.
There were 3 earthquakes in the Papua province of Indonesia, causing a tsunami which also added up to this flood. Too much effort has been put into developing areas into wonderful places and nevertheless has overlooked into the drainage systems. Areas located more centrally or further north from Marina Barrage are still vulnerable to floods as the drains there do not have the capacity to contain water during an intense downpour.
Eighteen children were trapped in a childcare centre at Telok Kurau Lorong G. A passenger and a taxi driver were also stuck in floodwaters at the junction Macpherson Road and Kampong Ampat.
Business at a cafe in Liat Towers in Orchard Road ground to a halt. Motorists and commuters were stuck in traffic in Thomson, while part of the CTE had to be closed for about two hours due to a fallen tree. Four people were injured when falling trees and tree branches landed on the cars they were driving.
The massive flood in many areas of central Singapore, including Orchard Road, caused businesses to lose millions of dollars. The intersection between Orchard and Scotts Roads made it impassable for vehicles and pedestrians. Bus services were disrupted for a few hours, from about 10am to 1pm. 
We could install and maintain storm drain pipes or holes to reduce streets and houses flooding.
We can remove blockages from stream channel and we can build a winding tunnel underground.
