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 |  MRWA WATER CALCULATOR  |
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The MRWA Water Calculators provides assistance to designer and
contractors in working out a range of different formulas
referenced in the WSAA MRWA Water Code.

For any updates, corrections or suggestions to the MRWA Water
Calculator please contact an MRWA representative at:

standards@citywestwater.com.au
standardsissues@southeastwater.com.au


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 |  DISCLAIMER  |
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MRWA Water Calculators are published by the Melbourne Retail
Water Agencies on the understanding that:

* Melbourne Retail Water Agencies and individual contributors
  are not responsible  for the results of any action taken on
  the basis of information in the MRWA Water Calculators, nor
  any errors or omissions.

* Melbourne Retail Water Agencies and individual contributors
  disclaim all and any liability to any person in respect of
  anything, and the consequences of anything, done or omitted
  to be done by a person in reliance upon the whole or any part
  of the MRWA Water Calculators.


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 |  CHANGELOG   |
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Version 1.9 | 2016-11-25
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*All thrust calculations now use OD (not a mixture of ID & OD) and a Factor of Safety of 1.5.
*PE pressure testing calculator now has explanations on what to do when there are PE mains of different size.
*PE pressure testing calculator now has explanations on potentially using a No Loss test for systems that have both PE and non PE mains.
*PE pressure testing calculator now has explanations in interpreting the equation.
*The thrust anchor calculator (individual) has a revised diagram included from the updated standard.
*The PE shrinkage restraint calculator has a revised diagram included from the updated standard.
*The PE shrinkage restraint calculator now provides area contributions for the different forces so the net area can be better understood.
*The restrained main calculator now provides for both restrained Di and PE pipe.


Version 1.8 | 2016-08-01
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*Internal CWW development which went out for internal comment and feedback but was never published.


Version 1.7 | 2014-06-02
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*Thrust anchorage (individual) calculator now displays minimum 0.30m2 for inline thrust restraints.
*Comment box removed from PE Shrinkage Restraint calculator.


Version 1.6 | 2013-01-10
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*PE Shrinkage Restraint calculator now gives the area corresponding
 to max force which is now takes into account Shut Valve Force OR
 Poissons Force, not both,
*The Individual Thrust Calculator now has Tapers integrated into the
 one form,
*The Individual Thrust Calculator now gives more correct advice on 
 whether concrete or timber is an acceptable restraint material (ie:
 Taper & Valve restraints must be concrete even at smaller areas),
*Pipe sizes are now more generic and not specific to brands.


Version 1.5 | 2012-10-31
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*Added change in length due to Poissons in PE Shrinkage Calculator
*Minor updates to symbols in line with standard symbology in PE
 Shrinkage Calculator


Version 1.4 | 2012-09-26
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*Minor bugfixes to Thrust Anchorage for Water Mains (Project)


Version 1.3 | 2012-09-24
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*Updated Trust Anchorage for Water Mains (Project) to let you
 either select a standard pipe from the drop down list or enter
 any value for the external diameter.
*Fixed error in calculation for Pressure Testing PE Pipe


Version 1.2 | 2012-06-07
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*updated Test Pressure calculation in Thrust Anchorages for
 Water Mains (Individual)


Version 1.1 | 2012-05-07
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*updates to PE Shrinkage Calculator to reflect changes to
 MRWA-W-205A
*Reduced header size


Version 1.0 | 2012-04-12
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*Initial Release
*Calculators included:
 -Pressure Testing PE Pipe
 -Thrust Anchorage for Water Mains (Project)
 -Thurst Anchorage for Water Mains (Individual)
 -PE Shrinkage Restraint
 -Restrained Main Length
