Infiltration TrenchDesign Notes

• Field verification of soil permeability essential

  • fc > 0.5 in/hr

• Require infiltration tests and test pit/soil boring at location of proposed facility

  • 1 test pit/soil boring per 50 ft of trench to depth of 4 ft below bottom of proposed facility bottom

• Geotextile fabric should interface between the trench sidewalls and stone reservoir and top gravel filter

• A 6-inch sand filter layer should be placed on the bottom of the infiltration trench

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The next 2 slides provide specific design and sizing guidance for infiltration trenches.