Subject:  How to Make a Small Model out of a Large Model in H2OMAP Sewer

The process is easy if you use Domain and Facilities.  

Step 1.  Use the Trace Upstream Network Command in Utilities to find the upstream network from your node of interest.  The upstream network is saved to a Domain.

Step 2.  Use the Facility Manager to 1^st deactivate the whole network and then 2^nd to add the Domain to your Facility or the nodes and links that you will simulate

You now have a smaller network to examine in Detail.  You may have to make a temporary Outfall node to run the model if there are no Outfalls in the model.

via Blogger http://www.swmm5.net/2013/08/how-to-make-small-model-out-of-large.html