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PondPack - Outlet Control Structures

I have a riser with a weir that discharges to a triple box culvert.  Do I put all three at elements in one outlet control structure?  I put the downstsream id for the riser and the weir as the culvert.  Then I put "free outfall" as the downstream id for the culvert.  But then you have to do a tailwater condition for the entire structure, so I generated an elevation-flow curve for the culvert in a separate program (HY-8) and then I put that in as the tailwater condition for the entire structure.  Is that right?  Something is wrong b/c my estimate peak flows are ridiculous compared to my 100-year inflow that I entered in for the catchment area (100,000 cfs vs. 1,000 cfs).  Any thoughts on what I did wrong?