Singapore Drainage System Able to Cope?

This morning (25th June 2010) heavy downpour, another day of flooding in Singapore, though not as severe as the Orchard River syndrome 16th June 2010. While global warming is one main cause, is this country drainage system infrastructure and its design truly built to cope? Despite the water pump system at the Marina Bay Reservoir is the world second largest, next to the one in Amsterdam - not sure if this pumping system is part flood management system of the entire island of Singapore, the increased frequency of severe flooding here aroused genuine concern among Singaporeans.
http://www.asiaone.com/News/AsiaOne%2BNews/Singapore/Story/A1Story20100625-223858.html