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Infiltration practices are those that capture and temporarily store the water quality volume before allowing it to infiltrate into the soil over approximately a two day period. These practices are an excellent technique for meeting recharge requirements and can also provide stormwater detention and channel protection storage in certain limited cases. Design variations include the infiltration trench and porous pavement. Infiltration basins are also sometimes used; however, they tend to clog very easily, and therefore rely heavily on the site-specific conditions for success. The dry well, which is a infiltration trench draining a rooftop downspout, is also an infiltration practice used by many practitioners. Since it is difficult to provide effective pretreatment for the dry well, it tends to clog easily, and is therefore not widely recommended for application.
This slide show provides a presentation on basic design guidance for stormwater infiltration systems, which include infiltration trenches, shallow infiltration basins and porous pavement.