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  1. jonrpatrick

    Video - storm spewing out of huge manhole?

    Tropical depression 2 happened around the time of this video in 1999.:: http://en.wikipedia.org/wiki/Image:Td2a1999filledrainblk.gif Anybody knowledgable about the range of effects for hurricanes and tropical storms who could verify if this storm crossing near the Yucatan could cause a storm...
  2. jonrpatrick

    Video - storm spewing out of huge manhole?

    I don't know where to upload this for all to see, but there's a video forwarded to me from a roadway, where stormwater gysers out of a manhole that looks to be 8' in diameter, and the lid crushes the front of a truck passing by. It's date-stamped july '99, and it happened about 5:20 in the...
  3. jonrpatrick

    spread calculation

    I'll be honest, I am totally surprised at some of these responses: having never to have done them?? Wow! I live in the Charlotte, NC area, and every municipality surrounding charlotte requires it. Of course, they all use the same standardized inlets, so they provide the formulas to use and the...
  4. jonrpatrick

    Detention pond routing with variable tailwater - program?

    I have a detention pond outleting into a floodplain. we have a 100 year detention requirement. Obviously, as the flood waters rise in the floodplain, my tailwater will be increasing and decreasing the head my outlet structure is working with. Primarily I use Hydroflow Hydrograph2004, and it...

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