That forum post you cited is pretty good. The problem is that you don't know where water loss is occurring. One assumption, that isn't too difficult, is to assume that loss at a node is the same fraction of the base demand at all nodes. You can increase the demand by x percent at the junctions globally to account for leaks. Then take that percent that is leaks and modify the property "Percent of Demand that is Pressure Dependent" to account for it. Example. Say the non-leak demand at a node is 8 L/s and you have 20% leakage of total. This means that total demand is 10 L/s (T = 8 + 0.2T). Total demand is (1.25 x 8) (1.25 comes from 10/8). Make "Percent of Demand that is Pressure Dependent" = 20. You can set this with a global edit if you add that column to the junction flex table. Or you can adjust it node by node. There is no guarantee that this will be accurate because you don't know where the leaks are. But this is reasonable.
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