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Jump in Peak Flow rates during anaylsis

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Message 1 of 3
MichaelSaadeh
336 Views, 2 Replies

Jump in Peak Flow rates during anaylsis

In my model, I run the analysis of the storm sewer design and there are unexplained jumps in the peak flow rates. I checked the subbasin information that I input and the external inflows to make sure that I did not input any other flows. The total peak flow in the model from all the subbasins combined is around 8 cfs and the model gives me 134 cfs at the outfall. Please, can some one explain why those jumps in peak flow rates occur?

 

Thanks,

Mike

2 REPLIES 2
Message 2 of 3
dslocum
in reply to: MichaelSaadeh

I'm seeing the same thing. Did you ever find a solution?

Message 3 of 3
MichaelSaadeh
in reply to: dslocum

Yes, the reason those jumps in peak flow rate were occuring in my model was because I had a a 5ft bench at my outfall structure. When I dropped the bench to about 1 ft, the peak flow rates dopped and gave a me a more reasonable answer. Its not ideally the best solution but you have to lie to the system in a way to get it to display the flowrates you want. Just make sure you dont bench your structures if thats the case in your model.

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