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A new version of DRAINS is available that allows users to define IL-CL subcatchment areas into three categories: Effective Impervious Area (EIA), Remaining Impervious Area (RIA) and Pervious Area (PA). RIA is routed through PA, allowing a more rational treatment of…

A new version of DRAINS is available that allows the import of Pre Burst rainfall data from the ARR Data Hub. This includes Transformational Preburst Depths for NSW OEH requirements to calculate the Probability Neutral Burst Initial Loss and Median Preburst…

A new final version of ARR is now available.  In short, key ARR 2019 updates include removing 'Draft' from the guideline, the completion of Book 9, reflection of current climate change practice, improvements to the ARR web-based user experience, and…

A final draft of Chapter 6, Book 9, of ARR 2016 was released in January 2019.  New in this draft is the advice to use the published pre-burst rainfalls for the 60 minute rainfall burst duration for all burst durations less than…

A new version of DRAINS is now available that incorporates ARR2016 procedures.  It includes a new Initial Loss - Continuing Loss Model, use of IFD 2016 data from the BOM web site, and use of ARR 2016 rainfall pattterns from the…