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Hydraulic Grade Line

Hydraulic Grade Line

Hydraulic Grade Line

I am designing some storm drain pipes but I have difficulty to find the right hydraulic grade line for those systems. I am designing with circular and elliptical pipe. I would like some help could be some tips, information of how to do it. Thank you  

RE: Hydraulic Grade Line

If you are designing a new system connecting to an existing system then I usually reanalyze the entire system.  If this is a stand alone new system then the analysis is straight foward.  Sounds like this is first time designing a storm drain so I will point you to a step by step procedure, HEC22.  Go to FHWA's website and download HEC22 pdf.  It will be a great help.

RE: Hydraulic Grade Line

Are you having a specific problem or just don't know how to do the analysis?  If it is a specific problem or issue please clarify your question.  If you don't know how to start, I think that the agency or your client would expect that you have some expertise before designing a drainage system based on teaching yourself from a book.  If you haven't done this type of engineering analysis before you should be working under the supervision of a licensed engineer, who should be able to help you, or hire a qualified consultant.  HEC-22 is a great reference, but here in Washington (and I assume the other states as well) our state code requires that engineering analyses are supposed to be overseen by a qualified (i.e. experienced) and licensed engineer.

Good luck!

RE: Hydraulic Grade Line

you might do the design assuming only circular pipe and then substitute an appropriate size of eliptical pipe in your final plans.  Get the pipe supplier to provide the hydraulic data for the eliptical pipe and recommend a size to replace the circular pipe.

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