Hi, I need to get this situation resolved. I need to verify a stormwater conveyance analysis and I'm puzzled as to why the two models provide different flow capacity values. A consultant provided me a Hydraflow conveyance model that shows "Cap Full" (Capacity Full I presume?) values are substantially larger than "Full Q" values I modeled in StormSHED. The Q values that actually flow through each reach are very close for both programs, but the max capacity values dictate whether or not the conveyance model passes the design criteria. His model passes because his capacity values are so high that it will never overtop, but my StormSHED model says that it fails because my capacity values are much lower. Here are the capacity values for each reach. StormSHED (cfs) Hydraflow (cfs) 17.74 32.65 11.45 25.34 6.28 5.25 2.9 5.33 6.4 5.35 3.25 7.54 3.68 6.74
It was brought to my attention that StormSHED is a gravity- based program so when it computes pipe full capacity, it's based on gravity, not some surcharge. How does Hydraflow compute "Cap Full" values? I don't have a copy of the program so I can't research it. Thanks so much for your time.
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