Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

Register Log in
  • Congratulations waross on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. htb723

    How to make the rational formula match StormCAD results?

    After perusing the StormCAD FAQ: http://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/5078.general-stormcad-faq.aspx The unit conversion from acre'in/hr to cfs is taken into consideration. So if I multiply my answer by the conversion factor, 1.008...
  2. htb723

    How to make the rational formula match StormCAD results?

    The 8.55 came from multiplying the area by the runoff coefficient 9*0.95 = 8.55 So if I update the equation: Q = (0.95)(0.991)(9) = 8.47 csf It's still slightly off. What factor's are being taken into consideration here? Is it even possible to prove my hand calcs accurate?
  3. htb723

    How to make the rational formula match StormCAD results?

    I am required to prove my results from StormCAD using hand calculations and my results are off. First, the drainage area is, 9 but when I look at the properties for the outfall node, it's slightly less, 8.55. I'm not sure why this is. Using the outfall's given Area in acres, the intensity...
Back
Top