I've been reviewing the method by which Revit applies diversification to domestic (potable) water networks using fixture units as the input to the systems. This method is common practice throughout the world with most countries or regions offering up differing diversification values, based on local data and standards. Working in the Australia/New Zealand region, the diversified flow values differ by as much as 3x to the values used in the US. The values used in the UK are more aligned to the Aus/NZ but again, are not the same. As best i can determine, Revit can only use the values as given by the International Code Council International Plumbing Code. Unsurprisingly these are what are used in the US (quote from the ICC website "Most US communities and many global markets choose the International Codes) but are not what we need to allow us to use the auto pipe-sizing tools in Revit outside of these markets. Looking at other modelling software out there it would seem there is some adoption or ability to use other standards for pipe sizing (AECOsim can size based on multiple British Standards for example) so when will Autodesk offer these to its international markets?
