Thank you, Scott. I uploaded the model to Sharefile. Basically, we have a 20,000 LF, 21.3-ft tunnel, with 6 dropshafts. The tunnel will be used to divert excess flow from a sanitary trunk sewer and store it until it can be pumped back to the trunk sewer. I have modeled the dropshatfs as bolted manholes. The d/s end of the model has a wet well (approx. 25,000 gal) and a pump. I'll be looking at filling patterns first, so I added a pump curve that basically has the pump off all the time. The model is sending the excess flow as an overflow to the wet well, so I cannot see the backwater effect on the tunnel. Thanks again for looking at this.
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