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2. Impervious surface - Wikipedia

   en.wikipedia.org/wiki/Impervious_surface

   Impervious surfaces are an environmental concern because their construction initiates a chain of events that modifies urban air and water resources: The pavement materials seal the soil surface, eliminating rainwater infiltration and natural groundwater recharge. This can cause urban flooding. An article in the Seattle Times states that "while ...

3. Grading (earthworks) - Wikipedia

   en.wikipedia.org/wiki/Grading_(earthworks)

   Grading in civil engineering and landscape architectural construction is the work of ensuring a level base, or one with a specified slope, [1] for a construction work such as a foundation, the base course for a road or a railway, or landscape and garden improvements, or surface drainage. The earthworks created for such a purpose are often ...

4. Storm Water Management Model - Wikipedia

   en.wikipedia.org/wiki/Storm_Water_Management_Model

   The EPA storm water management model (SWMM) is a dynamic rainfall-runoff-routing simulation model used for single event or long-term (continuous) simulation of runoff quantity and quality from primarily urban areas. The runoff component of SWMM operates on a collection of subcatchment areas that receive precipitation and generate runoff and ...

5. Drainage - Wikipedia

   en.wikipedia.org/wiki/Drainage

   Drainage. High-density polyethylene pipe installation in a storm drain project, Mexico. Drainage is the natural or artificial removal of a surface's water and sub-surface water from an area with excess water. The internal drainage of most agricultural soils can prevent severe waterlogging (anaerobic conditions that harm root growth), but many ...

6. Drainage density - Wikipedia

   en.wikipedia.org/wiki/Drainage_density

   Drainage density is a quantity used to describe physical parameters of a drainage basin. First described by Robert E. Horton, drainage density is defined as the total length of channel in a drainage basin divided by the total area, represented by the following equation: [1] The quantity represents the average length of channel per unit area of ...

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