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Hydraflow Storm Sewers does not handle Plunging Flow (Drop)

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fcernst
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Hydraflow Storm Sewers does not handle Plunging Flow (Drop)

 

Hydraflow Storm Sewers can not properly handle drop manholes (plunging flow) due to the fact it only uses the FHWA Approximate Method. The StormCAD result is shown in images further below:

 

200 cfs, 60" pipes @ 1% slope,  supercritical flow:  

 

Hydraflow Storm Sewers:

Capture.JPG

 

 

Also note zero values for depth, area and velocity head in Hydraflow Storm Sewers:

 

Capture3.JPG

 

StormCAD:

 

Capture6.JPG

 

Capture5.JPG

 

StormCAD offers HGL In/Out for the structures as shown below:

Capture1.JPG

 

 



Fred Ernst, PE
C3D 2024
Ernst Engineering
www.ernstengineering.com
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