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Planning & Design

Key Aspects

The design of a drainage system consists primarily of two components: (a) hydrological analysis, which involves the estimation of peak runoff generated from our catchments and (b) hydraulic design, which includes the determination of drain sizes to convey peak runoff.

PUB takes several factors such as the degree/type of development, catchment area and rainfall intensity into consideration when designing drains and canals. The alignment of the drains and canals are based on the drainage reserves that have been safeguarded.

However, given the uncertainties in weather patterns, PUB is designing drains to cope with more intense rain, within the constraints of cost effectiveness and competing land use.


Click here for FAQs on Drainage Planning [PDF].

Private and public developers also play a part in stormwater management as they can implement source measures to manage peak runoff from their sites to the public drainage system, and receptor measures to protect their developments from floods. Qualified Persons (architects and engineers) and ABC Waters Professionals thus need the right skills to develop on-site solutions. For more information, please visit:

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