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Recent content by johnlai

  1. johnlai

    sub drain

    Has anyone designed a perimeter sub drain system for a pond? The water table is below the bottom of the pond.
  2. johnlai

    vibration of vibratory hammer in sheet pile driving

    I am investigating vibrations due to sheetpile driving to an existing pipeline. I have an equation for peak particle velocity v = square root ( 2*c/ZL*wr) wr = energy transferred to the pile. My question is : what is the unit of wr in metric? Is it Joules?
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