We are running a model of a large network (20,000 customers, and including 40 tanks plus a large number of pumps and control valves).
Every time we run the model for water age (running a 90-day EPS), we seem to get a different set of results for the water age in the tank. In most cases the difference is only in the order of one day or so, but sometimes it's up to 9-10 days. We have done a number of tests (changing nothing but the location of the file) and it looks like each time the model is run on a different computer, the results are different, but if we keep to the one computer then they are the same.
This inability to replicate the same result each time is causing us (and our client) some concern, so I'm just after some more detail about how the water age is calculated and whether this is a known or expected result? Is there an element of randomisation in the calculation?
Thanks, Liz
Hello Liz,
Are both computers, that you've run the model on, using the same version of WaterGEMS and patch set? Check the date and version number by going to Help > About WaterGEMS.
Where in the model are you seeing a difference in calculated age?
Try the suggestions in the following article.How can I troubleshoot my model when my water age results don't appear correct?
If that doesn't help then please provide the model as explained in the following article.Sharing Hydraulic Model Files on the Haestad Forum
Regards,
Craig Calvin
Bentley Technical Support
Also, are both computers running the same bitness (32-bit vs 64-bit)?
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.