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  1. Mike17650

    Max HW/D = 1.5 for culverts - Why?

    A number of culvert design standards say that the maximum headwater depth is limited to 1.5 x diameter of the culvert. Can anyone explain the basis for this criteria? We're designing a replacement culvert for an old 3-ft diameter culvert that collapsed. If we replace it with another 3-ft...
  2. Mike17650

    Autodesk LDD vs. StormCad & Pondpack

    I am considering whether to purchase StormCad and Pondpack programs by Haestad Methods. We just got Autodesk LDD 3, which has Civil Design modules for designing storm drain systems, and stormwater management ponds. We have used previous versions of Autodesk LDD for grading and road design, but...

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