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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. 

July 27th, 2012

The DRAINS procedure for generating storms with ARR87 rainfall patterns has been improved.  You can now quickly generate multiple storms using tabular data obtained from the BOM (Bureau of Meteorology) web site.  The BOM web site lets you generate a table of coefficients or a table of intensity values (IFD table).  The table of coefficients is recommended if you wish to use the BOM IFD data.  If you wish to use Council IFD data then you can generate a BOM IFD table and replace the BOM intensity values with Council values. You can add extra lines to the table to provide any missing data (e.g. 25 minute storms are missing from the BOM IFD table).

June 12th, 2012

The DRAINS installation procedure has been amended to allow silent installation.  This should be of interest to IT administrators who need to install to many computers.  Click here  for more details.

February 9th, 2012

The pit data bases in DRAINS for Victoria, WA and Tasmania have been updated.

July 7th, 2011

There is a new User Manual for DRAINS available from the Download page.

January 7th, 2011

The Help System in DRAINS has been updated.  The full unsteady flow hydraulic model has been renamed the Premium Hydraulic Model to better distinguish it from the Standard Hydraulic Model.