Many green stormwater infrastructure systems and practices utilize infiltration because it effectively filters pollutants, slows water movement, provides temporary water storage and recharges groundwater. While infiltration practices are fairly common (infiltration trenches, infiltration basins, flow through planters, dry wells, and pervious pavement), they are often inappropriately designed. The key to effective use of infiltration is an in-depth understanding of site-specific soil characteristics. At sites with high nutrient and pollutant loads (hot spots), infiltration practices are not recommended due to potential groundwater contamination. Below are a few examples of GSI best management practices that utilize infiltration.