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  1. DrainageEnthusiast

    HEC-RAS Flow Regime

    @gbam Thank you very much
  2. DrainageEnthusiast

    HEC-RAS Flow Regime

    @gbam That's interesting! So you're saying I should stick with subcritical than mixed flow regime? As you can see in the image I have attached, the channel bed is made up of existing ground/soil, covered with very thin loose gravel that were washed away. We're proposing to fill the bed with...
  3. DrainageEnthusiast

    HEC-RAS Flow Regime

    If the existing or proposed channel I'm modeling (with steady flow condition) has a mix of mild and steep ground slopes, which flow regime shall I use in order to predict the possible water depths along the channel? Subcritical Supercritical Mixed I tried to compare the output results of each...
  4. DrainageEnthusiast

    How to model channel on HEC-RAS with different surface material?

    @gbam Thank you for your response. Yes, it's pretty straight forward, I got it, thank you very much.
  5. DrainageEnthusiast

    How to model channel on HEC-RAS with different surface material?

    Hello everyone, I have 3 questions and I'll greatly appreciate if you can help me out on this: 1. I would like know if you can create a channel model with different surface material on HEC-RAS software? I have attached an image showing a section of the channel with a steel sheet pile on one...
  6. DrainageEnthusiast

    Which method to use with drainage area greater than the limit for Rational Method? UCS method?

    @ beej67: Exactly! Thank you for clarification. I appreciate your help and the info. Two more thing: 1. Do you think HEC-22's sheet flow of travel length 130m(400 ft)is a bit much? I think WinTR-55 lessen this to around 30m (100 ft)only recently when they upgrade their free software. I haven't...
  7. DrainageEnthusiast

    Which method to use with drainage area greater than the limit for Rational Method? UCS method?

    @gbam: The project area has narrow valleys (they call it wadi here, very dry and I think they have resistant to erosion, but I haven’t read the soils report yet) along the southeast and the northern part. Per hydrology study, the flowpath direction is from southwest to northeast. Yes there is a...
  8. DrainageEnthusiast

    Which method to use with drainage area greater than the limit for Rational Method? UCS method?

    I've been practicing road design for quite some time now and along with it is the road drainage design for urban areas. But majority of my work in drainage requires me to use only rational method because most of the projects are residential subdivisions with small commercial areas and parks...
  9. DrainageEnthusiast

    Is there anyone knows EPA SWMM??

    I guess so, because some of my colleagues are saying the same thing...it's a very good hydraulic software. But none of them have the time to explain and train me comprehensively how to use it. We are all busy right now. So I have to teach myself how to use it by reading the tutorial. The only...
  10. DrainageEnthusiast

    Is there anyone knows EPA SWMM??

    Okay thanks for the response. However, it seems I'm gonna need to read again the tutorial. I can't understand how the Map animator works and also the choices in Themes (subcatchments,Nodes,links and how it relates to the layout) and time period. I can't identify the "head" (I suppose that's the...
  11. DrainageEnthusiast

    Is there anyone knows EPA SWMM??

    First of all, I'm practicing hydraulics for quite a few months now. Only recently I had a hard time doing calculations manually or in an excel spreadsheet. I need to calculate or check the HGL or EGL of my storm water system that uses circular pipes and box culverts in a very large network.(i.e...

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