[rainman]

I'm having the same problem, but I guess I don't expect too much from free government code. I suspect if we had to pay for this code that we wouldn't be having such trivial problems. I can't even find any explanations of the error codes in the online manuals which aren't all that helpful either. With my luck I'll wind up having to write a spreadsheet to route the hydrograph through the reservoir myself. Sorry I don't have the answer, but it appears to me that HMS is somewhat finicky and unresponsive to say the least. Still - it's free and it does seem to work some of the time so I suppose I can't complain.