Thank you for your response. I had actually started modeling the system with an outfall instead of the wet well/pump combination, but I was not able to get the model to simulate a zero outflow condition (which is what will happen when the pump is off) --I uploaded the model to Sharefile-- I tried several options for the outfall boundary condition: - Tailwater above crown of tunnel (325 ft) -- it causes the last section of pipe to be immediately under pressure, which shouldn't be the case since at such low flows, the pipe is not full. Also, the flow out of outfall is the sum of inflows rather than zero. - Outfall elevation of 325 (like a vertical wall that blocks flow) -- model gives negative/positive random flows/depths - Elevation-flow curve (table with zero flow for all elevations from 300 to 430 ft) -- outfall flow is sum of inflows, same answer as if the boundary condition is set to free outfall. Is there any other boundary condition I can use to simulate no outflow?
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