Can you post an SDB for us to test (and give the inlet ID)? I took a quick look at my HEC-22 2nd Ed. to see how the depth should be calculated for sag inlets and found an example (Example 4-14) for Combination inlets where they used equation 4-26 to solve for the depth above the inlet. I suspect the program is doing something similar, but want to check it with your data.
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