Infiltration trenches are underground, linear, rectangular or trapezoidal excavations with level or gently sloping bottom grade, geotextile filter fabric on sidewalls and top and filled with clean, crushed angular stone or other void-forming structures. They are well suited to sites where available space for infiltration is limited to strips of land between buildings or properties, or along road rights-of-way. They can also be referred to as infiltration galleries. See [[Perforated Pipe Systems]] fact sheet for guidance on infiltration trench systems integrated with conventional storm sewers that provide both infiltration and conveyance functions. | Infiltration trenches are underground, linear, rectangular or trapezoidal excavations with level or gently sloping bottom grade, geotextile filter fabric on sidewalls and top and filled with clean, crushed angular stone or other void-forming structures. They are well suited to sites where available space for infiltration is limited to strips of land between buildings or properties, or along road rights-of-way. They can also be referred to as infiltration galleries. See [[Perforated Pipe Systems]] fact sheet for guidance on infiltration trench systems integrated with conventional storm sewers that provide both infiltration and conveyance functions. |