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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. Bioswale - Wikipedia

   en.wikipedia.org/wiki/Bioswale

   They consist of a swaled drainage course with gently sloped sides (less than 6%). [2]: 19 Bioswale design is intended to safely maximize the time water spends in the swale, which aids the collection and removal of pollutants, silt and debris. Depending on the site topography, the bioswale channel may be straight or meander.

4. Rain garden - Wikipedia

   en.wikipedia.org/wiki/Rain_garden

   The first rain gardens were created to mimic the natural water retention areas that developed before urbanization occurred. The rain gardens for residential use were developed in 1990 in Prince George's County, Maryland, when Dick Brinker, a developer building a new housing subdivision had the idea to replace the traditional best management practices (BMP) pond with a bioretention area.

5. Stormwater - Wikipedia

   en.wikipedia.org/wiki/Stormwater

   In undisturbed areas with natural subsurface drainage, soil and rock fragments choke karst openings thereby being a self-limitation to the growth of openings. [13]: 189–190, 196 The undisturbed karst drainage system becomes balanced with the climate so it can drain the water produced by most storms. However, problems occur when the landscape ...

6. Two-stage drainage ditch - Wikipedia

   en.wikipedia.org/wiki/Two-stage_drainage_ditch

   "Over a mile long reach [of the water channel] adds up to over 1.5 acre of land needed for the two stage drainage ditch design". This acreage of land may already be currently used for other purposes or contains infrastructure and subsurface gas or sewer lines. Thus, the larger the channel is, the more soil, and thus, increased funds required to ...

7. Surface irrigation - Wikipedia

   en.wikipedia.org/wiki/Surface_irrigation

   Deep drainage - Overirrigation may cause water to move below the root zone resulting in rising water tables. In regions with naturally occurring saline soil layers (for example salinity in south eastern Australia ) or saline aquifers, these rising water tables may bring salt up into the root zone leading to problems of irrigation salinity .

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   mail.aol.com

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9. Catchwater - Wikipedia

   en.wikipedia.org/wiki/Catchwater

   Catchwater drains may take the form of concrete canals, such as in Hong Kong, where there are many.Alternatively, they may take the form of a large concrete sheet, smothering a hill, and preventing rainfall from entering the rock strata, with a smaller channeling system for transport of the water to the storage tank - this latter system is in operation in Gibraltar.