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Thread: Multiple Surfaces

  1. #11
    Civil Engineering Moderator MHultgren's Avatar
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    Default Re: Multiple Surfaces

    As you say, it depends on what she wants. I use ponds for my hydrology for the water volumes being retained \ detained by the basin. Once I get the volumes needed, then I create the contours using a grading object if the pond isn't too curvilinear. The grading object takes some getting used to when it comes to grading along a concave curve that extends the slope beyond the "Natural" radius. For example, take a concave curve with a radius of 20and tangents that are 30 feet from both ends, and grade with a 3:1 slope for a vertical difference of 40 feet and throw a couple benches in with a slope drain that is 6 ft. wide at the edge of the bench. The time it takes to clean up the contours created by the grading object can be better spent by just creating the base of the basin and using 3d offsets (create curb) to get the desired results.

  2. #12
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    Default Re: Multiple Surfaces

    Mark,

    I am totally aware of the limitations of the grading object
    that you outline. You would really enjoy setting in on this portion
    of my classes as I show how to resolve the problems
    you discuss and more.
    There are a few techniques that would prevent all of those clean-up
    issue you are encountering with the grading object, that has you
    resorting to 3d polylines being used to model your basins.

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