Good Calculator/Spreadsheet for Determining if road gutter runoff will blow past a catchbasin 1

[GJ1970]

I was wondering if someone could point me to a spreadsheet or method for determining if stormwater flow down a gutter pan will blow by a catchbasin?

 

[fel3]

Unfortunately, I don't have anything that will do what you are looking for. However, I do have a couple of Mathcad Prime 3.0 worksheets and an Excel spreadsheet that will calculate the hydraulic capacity of a street cross-section, in case you or anyone else is interested. They are available here:

https://community.ptc.com/t5/Mathca...-Street-Cross-sections-zip/m-p/450226#M176041

BTW, the .zip file includes .pdf print-outs of the two Mathcad worksheet for users of other versions of Mathcad or who just want to see how the calculations are set up.

Good luck in your quest.

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"Is it the only lesson of history that mankind is unteachable?"
--Winston S. Churchill

 

[TigerGuy]

Doesn't Neenah have some info on this available online?

 

[jgailla]

FHWA has procedures for bypass flow.

https://www.fhwa.dot.gov/engineering/hydraulics/pubs/10009/10009.pdf

 

[GJ1970]

Originally, I modeled the catch basins and gutter pan in HydroCAD: The catch basins has pond nodes with appropriate storage attributes to model the CB inlet and then half a street section (to see how high the flow would get in the section view), then an orifice for the inlet itself routing to the outlet pipe. I think I'm doing a good job at modeling capacity on roads with lower grades, but once you get north of 12% or so, there is a chance the velocity of flow could allow runoff to blow by the inlet. This is what I was wanting to check.

 

[TerryScan]

If the inlets are on grade, you are not modeling the capture correctly by just an orifice (even on milder slopes). It would be prudent to read HEC-22 that jgailla posted.

FHWA Hydraulic Toolbox software can compute gutter flow capacity and inlet capture on grade.

 

[beej67]

TerryScan nails it. Here's the download link:

https://www.fhwa.dot.gov/engineering/hydraulics/software/toolbox404.cfm

Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East -

http://www.campbellcivil.com