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High Tailwater
I am running HGL calcs for a storm sewer draining into a wet detention pond. The end section into the pond is submerged, which is reflected in the fixed tailwater elevation I've inputted boundary conditions of the outfall node. (The pond is not included in the model)
Despite the tailwater being set above the crown of the pipe (93.00'), the profile plot is showing the HGL much lower (91.10') after rerunning the analysis. (see attached)
Any suggestions on what I may be doing wrong, or limitations of the program?
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