Low Impact Development

Low-impact development (LID) is a stormwater and land use management strategy that strives to mimic pre-disturbance hydrologic processes of infiltration, filtration, storage, evaporation and transpiration by emphasizing conservation, use of on-site natural features, site planning and distributed stormwater management practices that are integrated into a project design.

Green stormwater Infrastructure (GSI) is Seattle’s term for the low impact developed-based stormwater management practices. Seattle’s GSI suite includes trees, bioretention, permeable pavements, green roofs and rainwater harvesting. In addition to the stormwater management functions of these practices, these technologies can simultaneously help filter air pollutants, reduce energy demands, mitigate urban heat islands, and sequester carbon while also providing communities with aesthetic and natural resource benefits.