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the design drain spacing (L) can be found from the equation in dependence of the drain depth (Dd) and drain radius (r). Drainage criteria One would not want the water table to be too shallow to avoid crop yield depression nor too deep to avoid drought conditions. This is a subject of drainage research.
Overland flow can be routed between sub-areas, between subcatchments, or between entry points of a drainage system. Since its inception, SWMM has been used in thousands of sewer and stormwater studies throughout the world. Typical applications include: design and sizing of drainage system components for flood control
To comply, retention basin has to be sized and shown on the site plan, and water has to be filtered and routed to a public drainage system. The new residential structure has to also comply with local storm water ordinances. [13] The drainage system has to be shown on the site plan (swales, drain piping, retention areas, ground water recharge). [14]
Low-impact development (LID) is a term used in Canada and the United States to describe a land planning and engineering design approach to manage stormwater runoff as part of green infrastructure. LID emphasizes conservation and use of on-site natural features to protect water quality .
Drainage density relates to the storage and runoff terms. Drainage density relates to the efficiency by which water is carried over the landscape. Water is carried through channels much faster than over hillslopes, as saturated overland flow is slower due to being thinned out and obstructed by vegetation or pores in the ground. [7]
EnDrain is software for the calculation of a subsurface drainage system in agricultural land. The EnDrain program computes the water flow discharged by drains, the hydraulic head losses and the distance between drains, also obtaining the curve described by water-table level.
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