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2. Urban runoff - Wikipedia

   en.wikipedia.org/wiki/Urban_runoff

   As stormwater is channeled into storm drains and surface waters, the natural sediment load discharged to receiving waters decreases, but the water flow and velocity increases. In fact, the impervious cover in a typical city creates five times the runoff of a typical woodland of the same size.

3. Drainage - Wikipedia

   en.wikipedia.org/wiki/Drainage

   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 soils need artificial drainage to improve production or to manage water supplies.

4. Tile drainage - Wikipedia

   en.wikipedia.org/wiki/Tile_drainage

   Tile drainage and the corresponding changes to the landscape - draining wetlands, wet soils, and channelizing streams – have contributed to more erosive rivers. [17] This response of rivers due to drainage is the result of shortening the residence time of water on the landscape.

5. Slot drain - Wikipedia

   en.wikipedia.org/wiki/Slot_drain

   In recent years, this drainage concept is more often used in both indoor and outdoor applications, such as fire stations, car washes, landscaping, shower rooms and garages, as well as highly-sanitized environments like food processing plants and breweries. [1] A slot drain is a modified trench drain. "Slot" describes its appearance on the ground.

6. Landscaping - Wikipedia

   en.wikipedia.org/wiki/Landscaping

   In order to landscape it, the land must be reshaped to direct water for appropriate drainage. This reshaping of land is called grading . [ 4 ] Sometimes in large landscaping projects like, parks, sports fields and reserves soil may need to be improved by adding nutrients for growth of plants or turf, this process is called soil amelioration.

7. Drain (plumbing) - Wikipedia

   en.wikipedia.org/wiki/Drain_(plumbing)

   Pool drain vortex as viewed from above the water at Grange Park wading pool Underwater view of drain, showing vortex-formation phenomenon. A drain is the primary vessel or conduit for unwanted water or waste liquids to flow away, either to a more useful area, funnelled into a receptacle, or run into sewers or stormwater mains as waste discharge to be released or processed.