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Andrew Pel
Andrew Pel

Andrew Pel

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Asked: 2021-03-01T05:17:04+00:00 In:

How does subsurface drainage work?

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How does subsurface drainage work?

subsurface drainage
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3 Answers

  1. avery

    avery

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    • The maximum amount of water that can be removed by a subsurface drainage system is the drainable porosity times the depth of the soil layer being drained. Typically, the drainable porosity is a few percent of the soil profile volume.
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  2. aron

    aron

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    • Most of the water in soil pores is held in the pores by suction forces and cannot be removed by gravity flow.
    • Following a wetting event (rainfall, snow melt, irrigation, or a rising water table) a small amount of the water in soil pores might be above a threshold called field capacity. Some of that amount can drain, through large pores, into a subsurface drain due to gravity flow.
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  3. andrew

    andrew

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    Subsurface drainage is the practice of placing perforated pipe at a specified grade (slope) at some depth below the soil surface. Excess water from the crop root zone can enter the pipe through the perforations and flow away from the field to a ditch or other outlet.

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