HydroCAD® Stormwater Modeling - Since 1986
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Modeling an Elliptical or Arch PipeStarting with HydroCAD 9.0, arch and elliptical pipes are available on the culvert, reach, pipe storage, and Tc screens. Just enter the pipe dimensions and you're done! And HydroCAD-10 includes a build-in table of common pipe sizes, automatically setting all the parameters for complex pipe-arch and elliptical shapes. Users of earlier versions are urged to update to the latest version to get the lookup table and native support for a full range of pipe shapes. What Dimensions Do I Need?In addition to the width and height, you must specify the top and bottom radii for the specific pipe you plan to use. (For an elliptical pipe, the top and bottom radii will be the same.) Although you may commonly refer to these pipes by just their width (span) and height, the radii can vary significantly depending on the pipe design, material, and manufacturer. The exact width and height may also be different from the nominal dimensions.
After you enter the width, height, and radii, HydroCAD will automatically calculate the corresponding corner radius. If the entry screen says "no corner solution" is generally means that the top and/or bottom radii are too small to allow a smooth (tangential) connection between the corner and the top/bottom of the pipe. In some cases, you may need to increase the manufacturer's radius very slightly in order to enable a corner solution. If you are having trouble getting started, try entering these sample values to see how the entry screen works: Width=36" Height=22" Top Radius=19" Bottom Radius=51" Common dimensions can be found in the following sources:
True Ellipse PipesHydroCAD-10 build 8 adds the ability to model a true ellipse shape, which can be oriented with a horizontal or vertical major axis. Note that an elliptical pipe is a pseudo-ellipse, generally having a fuller profile than a true ellipse of the same overall dimensions. |
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