Flood at Orchard Road

Someone wrote to me to link the flood at Orchard Road to the Marina Barrage. I do not understand how this could be the cause of the flood. However, it does appear that there were two serious floods in Singapore in recent years, i.e. the flood at Bukit Timah and now at Orchard Road. We used to have good drainage sysem in Singapore, but this seemed to have deteriorated. Can the experts share your views?

Tan Kin Lian