What is subsurface drainage?
andrewEnlightened
What is subsurface drainage?
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What is subsurface drainage?
avery
subsurface drainage describes the process of removal of that water which has infiltrated into the soil in excess of the amount that can be held by capillary forces against the force of gravity. Soils that require accelerated subsurface drainage typically have some impermeable or slowly permeable feature below the surface that prevents water that has entered the soil from moving deeper into the soil and underlying materials at a rate that allows agricultural production to be economically viable. Other criteria may involve the stability of roads and building sites. The obstruction to rapid percolation of water through the soil may be shallow bedrock, highly dense glacial till, depositional clay layers, and other similar causes. In other words, there is no natural outlet for the water, and the soil becomes saturated by the accumulated infiltration of water.
Andrew Pel
Subsurface drainage systems remove excess groundwater below the ground surface. Perforated plastic drain tubes are placed between 1 and 2 m below the soil surface. … The sizing of drainage pipes is based on the land slope and expected flow rate to pipes.
aron
Subsurface drainage is concerned with removing water that percolates through or is contained in the underlying subgrade. This water, typically the result of a high water table or exceptionally wet weather, can accumulate under the pavement structure by two chief means:
Gravity flow. Water from surrounding areas can be absorbed by the soil then flow by gravity to areas underneath the pavement structure. In pavement with high air voids (above 8 – 9 percent), water can percolate down through the pavement structure itself.
Capillary rise. Capillary rise is the rise in a liquid above the level of zero pressure due to a net upward force produced by the attraction of the water molecules to a solid surface (e.g., soil). Capillary rise can be substantial, up to 6 m (20 ft.) or more. In general, the smaller the soil grain size, the greater the potential for capillary rise. Often, capillary rise is a problem in areas of high groundwater tables.
John Wick
Surface drainage is the removal of excess water from the surface of the land. This is normally accomplished by shallow ditches, also called open drains. The shallow ditches discharge into larger and deeper collector drains. In order to facilitate the flow of excess water toward the drains, the field is given an artificial slope by means of land grading