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January 2019

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 60 minutes.  This means the Initial Loss - Continuing Loss model recommended in ARR 2016 can now be used for urban drainage work.  DRAINS has provided the ARR 2016 procedures since January 2017.


February 17th, 2017

Mark Babister advises that his firm WMA Water is now working on providing pre-burst rainfall depths for storm bursts of less than 1 hour duration.  This means that we will be able to use the Initial Loss - Continuing Loss Model for urban drainage work. 


January 16th, 2017


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 ARR data hub.  Please refer to the built-in DRAINS help system for more detail (start with the Recently-added features topic).


February 3rd, 2016

We intend to add procedures from Australian Rainfall and Runoff 2016 to DRAINS as they become available, and to feature them in our workshops.  The material released at www.arr.org.au by Engineers Australia includes an overview of new design rainfall patterns, hydrological losses, urban catchment land uses and other changes.  Use of the rational method is discouraged, and new design rules will likely relate to ‘ensembles’ of design storms.  Not enough information is available at present to implement these new procedures in DRAINS. 

June 28th, 2014

The design procedure in DRAINS has been improved to produce more economic designs.

The premium hydraulic model now allows overflow routes from a node in a channel system.  This allows quasi 2D modelling of systems where flow spills out from a node and flows in a new second direction when the water level rises sufficiently.

August 12th, 2013

Numerical stability in DRAINS was greatly improved.

March 1st, 2013

A fixed reporting time step of 0.1 minutes was introduced to allow smaller files.  DRAINS now runs under Windows 8 and later.