I have several years of site design experience and recently started working on a large site project in Louisiana, a new geographic location for me. All my experience is from States with clay and shale soils were the minimum slope is 2% on any surface. On this project the final surface is gravel and the client is saying they want the finish grade of the site to have a 1% or less slope. These are not heavily trafficked areas but see occasional passenger trucks. The in-situ soils and the fill material is all a well graded sand (AASHTO A3). Is a 1% slope a normal/acceptable minimum slope in this geographic area and/or for these type of sand soils?
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