Questions on Hydraulic Analysis Results

Why are my analysis results not what I think they should be?

These are answers to questions frequently asked by project engineers after initial review of hydraulic analysis results.

1. Why are the flows in the system less than what I would expect?
2. Why are the flows in the system more than what I would expect?
3. Why is the hydraulic grade line (HGL) higher above a pump than I expect? Advanced feature on overflow modeling.
4. Why are my Peaking Factor Method flows higher than I would expect?
5. Why do the sum of my peak flows below a diversion structure add up to more than the flows above the diversion structure?
6. Why do I get no flow in my system?
7. Why is the hydraulic grade line (HGL) higher than the d/D value flows in the pipe?
8. Why is the hydrograph window Maximum Discharge different than the DesignQ value for some entities?
9. Why are the results different than they were before?
10. Issues on Preserve Peak vs Preserve Volume relating to pumps and reservoirs.
11. Why don’t the component flow values add up precisely to the hydrograph total?
12. Why do my design pipes or replacement pipes have unexpected diameter, slope, invert, etc?