ABCW-5 Under Technical Review Engine v0.9.0
Stormwater Detention (Peak Runoff Control) calculator
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.
Not a PUB approval. This calculator is under technical review and is not yet validated against PUB's official calculation template. A passing calculation does not establish compliance with PUB requirements. ABC Waters design calculations must be prepared and endorsed by an ABC Waters Professional / Qualified Person and submitted to PUB in the required format.
Available after technical review
This module will open once it has been validated against PUB's official ABC Waters calculation template and independently reviewed. The method, inputs and references are listed below.
Inputs
- Project / feature reference
- Development catchment area (ha)
- Pre-development runoff coefficient
- Post-development runoff coefficient
- Allowable runoff coefficient
- Allowable discharge basis (1 = allowable C, 2 = pre-development peak)
- Design storm ARI (yr)
- Post-development time of concentration (min)
- Pre-development time of concentration (min)
- IDF table for design ARI: duration(min)=intensity(mm/h), one per line
- IDF values are the built-in EXAMPLE (1 = yes, 0 = replaced with PUB IDF)
- Tank effective plan area (m2)
- Maximum water depth above orifice centreline (m)
- Orifice discharge coefficient
- Adopted orifice diameter (0 = use computed size) (mm)
- Overflow design intensity (major event, tc) (mm/h)
- Overflow weir length (m)
- Available head over overflow weir (m)
- Weir coefficient