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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. 

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. 

December 11th, 2010

A new hydraulic model is now available.  The new Standard Flow Model will replace the Basic Flow Model that has been in service since 1998.  It offers improved stability and takes advantage of multi core processors to improve run times.  The Basic Flow Model will continue to be available for existing jobs.

The Standard Flow Model solves the full St Venant Equations for flow in pipes and channels.  The St Venant equations account for storage in pipes and channels, and this may have implications for how you formulate models.  For example, if you are using large diameter pipes to provide storage you may have been modelling these as detention basins in the Basic Flow Model.  This is no longer necessary with the Standard Flow Model.  In fact you should remove such detention basins from the model when it includes these large pipes.

The Standard Flow Model treats overflow routes in the same manner as the Basic Flow Model.  It ignores storage effects in overflow routes.  The Full Unsteady Flow model solves the St Venant equations in overflow routes (as well as in pipes and channels).  This storage can significantly reduce peak flows in overflow routes leading to a more realistic assessment of surface flooding with the Full Unsteady Flow Model.

The Basic Flow Model has struggled with some complex components.  For example, a car park with a pit/sump outlet needed to be modelled as an "off-line" detention basin.  With the Standard Flow Model it can be modelled as a simple sag pit where you specify depths vs storage for the volume ponded in the car park.

The Standard Flow Model will allow us to further develop DRAINS to better cope with complex arrangements such as multiple drowned outlets from a detention basin etc.

September 15th, 2010

The unsteady flow module in DRAINS has been updated.  It can now take advantage of multi core processors to greatly improve run times.  This feature is disabled by default.  It can be enabled in the Project / Options menu item.

March 25th, 2010

The unsteady flow module in DRAINS has been updated.  It can now check for signs of instability in pipe flows when a run is completed.  If instabilities are found, it can apply numerical damping to the affected pipes (at your discretion) to reduce or eliminate them.

November 9th, 2009 

DRAINS has been updated.  It can now check for updates (newer versions) since you last installated it - see under the Help menu item.

There is a new user manual and on-line help system within DRAINS.

October 13th, 2009 

DRAINS pipe design procedure has been improved.  This can result in a more economical design in some situations.

August 24th, 2009 

PIPES and PIPES++ have been updated.  They now

  • import the latest DXF files.
  • have a new on-line Help system compatible with all versions of Windows including Windows 7.
  • include Property Balloons which are useful to quickly review basic pipe and node data in networks that are unfamiliar to you.  They can be turned on or off from the View menu.  They are off by default.
  • can import polylines, and arcs on the background layer.  Arcs are sometimes used for drawing cul-de-sacs in a dxf file.
  • include support for panning and zooming using the mouse wheel.

July 2nd, 2009 

The latest version of DRAINS has improved DXF input capability.  It now supports the latest versions of DXF files and also supports polylines, arcs and circles on the background layer.

June 4th, 2008 

The latest version of DRAINS has pop-up balloons that show a summary of data for pits, pipes etc as you move the mouse cursor over the pit, pipe etc.  If you find these balloons distracting, you can turn them on/off from the View menu.

June 4th, 2008 

The Extended Rational Method (ERM) in DRAINS has been improved.  It now provides the option of automatic calibration against the standard rational method for peak flows from sub-catchments.  Such calibration is required by some Councils in Queensland.  It was found that the procedure used in the old ERM could produce higher peak flows than the standard rational method if partial area effects dominated in the latter.  You can still use the old procedure, but you now have the option of better calibration against the standard rational method if you are required to do so.  The procedure is discussed in detail in the on-line help system - look up ERM in the index, read the topic and then follow the link at the end for more technical details.


June 4th, 2008 

There have been some minor changes to the folder structure of DRAINS to suit Vista.  When you install Drains to the default folder, a new folder C:\ProgramData\Drains will now be created.  The default data base file DRAINS.DB1 will be stored in this folder.  This was necessary because Vista does not allow Drains to change DRAINS.DB1 when it is located under C:\Program Files.  It appeared to allow such changes, but was in fact storing the file somewhere else, and the location was different for each user.  This was causing confusion with multiple copies of DRAINS.DB1 being stored.  The new arrangement should help reduce this confusion.  Please note that, under Vista only, you will not be able to see the folder C:\ProgramData unless you are logged on as administrator.

May 13th, 2008 

The unsteady hydraulic model in DRAINS has been improved.  Sloshing of water (surging back and forth) in open channels and overflow routes was sometimes observed in DRAINS results.  This has been reduced with additional numerical damping applied to inertia terms in the unsteady flow equations.  Also shock losses at pits with very small loss coefficients were slightly overestimated in the past.  These have been corrected.  There may now be slightly greater capacity through pipes, but any changes are expected to be small.


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