The water below the surface, and typically below the groundwater table.
Natural or artificial means of intercepting and removing surface or subsurface water (usually by gravity).
Low Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting.