PUB ABC Waters design suite
Design calculations for ABC Waters design features under the PUB ABC Waters Design Guidelines and Engineering Procedures, and on-site detention for peak runoff control.
Calculators
Catchment Analysis (Rational Method)
Weighted runoff coefficient and peak runoff for a development catchment using the Rational Method, with a comparison against an allowable runoff coefficient for peak runoff control.
Singapore · PUB ABC Waters
Bioretention Basin (Rain Garden)
Treatment area, maximum infiltration (filtration) rate, extended detention storage, underdrain and perforation capacity, and overflow pit capacity for a bioretention basin.
Singapore · PUB ABC Waters
Vegetated Swale
Manning normal-depth solution for a trapezoidal vegetated swale: flow depth, hydraulic radius, velocity, Froude number, capacity, freeboard, erosion and safety checks, and treatment checks.
Singapore · PUB ABC Waters
Bioretention Swale
Combined conveyance (swale above the filter), filtration capacity of the bioretention trench, underdrain and perforation capacity, and overflow pit checks.
Singapore · PUB ABC Waters
Stormwater Detention (Peak Runoff Control)
Pre- and post-development peak runoff, allowable discharge, critical-duration storage (Modified Rational Method), orifice outlet sizing, level-pool storage routing and overflow weir check.
Singapore · PUB ABC Waters
Stormwater quality treatment (ABCW-2 to ABCW-4) and peak runoff quantity control (ABCW-5) are separate requirements and are calculated separately.
Technical resources
- ABC Waters Design Guidelines
- Engineering Procedures for ABC Waters Design Features (2024 Edition)
- PUB Circular: Lodgement Scheme for ABC Waters Submissions (2 December 2024)
- ABC Waters Certification Application Checklist
- ABC Waters Design Calculation Template (vegetated swale, bioretention swale, bioretention basin)
- Condensed Booklet of Engineering Procedures (ABC Waters)
- Declaration Form for ABC Waters Design Features