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Tile drainage is a form of agricultural drainage system that removes excess sub-surface water from fields to allow sufficient air space within the soil, proper cultivation, and access by heavy machinery to tend and harvest crops.
Septic drain fields, also called leach fields or leach drains, are subsurface wastewater disposal facilities used to remove contaminants and impurities from the liquid that emerges after anaerobic digestion in a septic tank. Organic materials in the liquid are catabolized by a microbial ecosystem. A septic drain field, a septic tank, and ...
The latest update notes and new features can be found on the EPA website in the download section. [10] Recently added in November 2015 were the EPA SWMM 5.1 Hydrology Manual (Volume I) [ 11 ] and in 2016 the EPA SWMM 5.1 Hydraulic Manual (Volume II) [ 12 ] and EPA SWMM 5.1 Water Quality (including LID Modules) Volume (III) [ 13 ] + Errata.
While there are more than two types of drainage systems employed in agriculture, there are two main types: (1) surface drainage and (2) sub-surface drainage. Crop yield (Y) and depth of water table (X in dm) [1] Figure 1 classifies the various types of drainage systems. It shows the field (or internal) and the main (or external) systems. [2]
Map of a well field for subsurface drainage with radial flow across concentrical cylinders representing the equipotentials. Both systems serve the same purposes, namely water table control and soil salinity control. Both systems can facilitate the reuse of drainage water (e.g. for irrigation), but wells offer more flexibility.
In geotechnical engineering, watertable control is the practice of controlling the height of the water table by drainage.Its main applications are in agricultural land (to improve the crop yield using agricultural drainage systems) and in cities to manage the extensive underground infrastructure that includes the foundations of large buildings, underground transit systems, and extensive ...
Farther west lies the border with San Diego County and to the south the international boundary between the US state of California and Baja California, Mexico. To the north is the boundary with Riverside County and the Coachella Valley , which with the Imperial Valley form the "Cahuilla Basin" or the " Salton Trough ".
a subsurface (groundwater), drainage model related to: a spacing equation for subsurface pipe drains and open ditches (horizontal drainage) or wells (vertical drainage); see watertable control; a hydrological subsurface drainage model; see soil salinity control for an example of an agro-hydro-salinity subsurface drainage model