New and redevelopment building projects will have to meet stricter flood management measures from June.
National water agency PUB announced this on Monday as part of its holistic storm water management strategy for Singapore.
The strategy includes a new clause that would require projects over a certain land size to have on-site storm water management strategies.
PUB is taking a three-pronged approach to prevent heavy rain from escalating into floods.
To tackle the flooding problem at the source, it is implementing a new rule into its revised Surface Water Drainage Code of Practice.
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