Low Impact Development (LID) is a specialized approach to land development that aims to minimize the impact of man-made structures on the natural environment. LID techniques include the use of permeable pavement, green roofs, rain gardens, and other measures that encourage natural water filtration and the preservation of vegetation. LID is becoming increasingly popular as developers and municipalities seek to reduce the negative impact of development on the environment, and as such, LID has become a specialized skill that requires training and expertise.