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  1. layfieldman

    French Drain Flow Rates

    I'm looking for typical flow rates through a french drain with perforated pipe in it. Say 1' x 1' cross section. Does anyone have data or knows where I can get such data? Also, does anyone know of any alternates to gather flow sub surface?
  2. layfieldman

    Soft Soil Around UG Pipe in Parking Lot

    My customer wants to use a geogrid or geotextile to help with a soft wet silty clay around a underground gas pipe over which his parking lot is being built. There is 200mm of this soil over which 200mm of granular fill with a 50mm asphalt pavement will be placed. I know the calculations for...

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