Install Infiltration System
Infiltration BMPs remove stormwater pollutants and decrease stormwater volume via infiltration into the soil. There are multiple variations on infiltration facilities, including shallow basins, rock-filled trenches, and underground end-of-pipe treatment. Infiltration systems provide a 100 percent reduction of pollutant discharge to surface waters by infiltrating the entire design storm, filtering out contaminants. Potential issues include: High water table and low permeability soils can preclude the use of infiltration galleries and use should also be avoided in areas with existing groundwater contamination; the infiltration of glycol is typically not allowed; and pretreatment is recommended to prevent clogging and resulting ponding. Routine maintenance includes removal of trash and debris on the surface.
Practice Information
| Staffing Requirements: | Low (10 – 50 hours per month) |
| Environmental Benefits: | Low environmental benefit |
Airport Characteristics
Categories
Case Studies
San Diego International Airport (SAN)
At the west side of the airport, as part of the Green Build project, a 1.75-acre stormwater infiltration system was installed. Nearly 1/3 of the 30 acres of new airfield tarmac has been designed to drain into the infiltration system. The system is constructed of FAA-approved artificial turf installed at the surface with a layer of reservoir stone below. A 2-inch layer of sand has been placed on the turf to hold it in place. The infiltration system includes the 3-4 inch reservoir stone that captures and infiltrates approximately 18,000 cubic feet of stormwater runoff (meeting the MS4 Permit requirement to treat the volume of water from the 85th percentile of 2-year storm event). The infiltration basin is another low-impact development (LID) feature that allows stormwater runoff to infiltrate into the ground.
Related Links
Stormwater Management Fact Sheet: Infiltration Trench. Stormwater Manager's Resource Center.
Types of Infiltration trench. Minnesota Stormwater Manual. Minnesota Pollution Control Agency.
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