Source solutions
PUB included a new requirement, which took effect on 1 January 2014, for developers to implement “source solutions” to slow down surface runoff entering the public drainage system. These on-site measures could include detention tanks and/or ABC Waters design features which will help introduce more flexibility within the existing drainage system.
Pathway solutions
To strengthen “pathway” solutions, PUB raised the design standards in 2011 for drains to cater for more intense rainfall events. Depending on the size of the catchment, this could mean an increase of between 15% and 50% in drainage capacity.
Receptor solutions
In 2011, PUB also raised the requirements for the minimum land reclamation levels, as well as platform and crest levels for new developments and redevelopment sites, under its revised Code of Practice on Surface Water Drainage. These “Receptor” measures provide additional flood protection for buildings and key infrastructure.
The “Managing Stormwater for Our Future” publication presents an overview of PUB’s stormwater management strategies, approach and requirements that will help prepare Singapore for the future. It also outlines plans for 12 waterways in Singapore.