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This article in SSSAJ

  1. Vol. 25 No. 2, p. 142-145
     
    Received: Apr 15, 1960


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doi:10.2136/sssaj1961.03615995002500020022x

Tile Drainage for Layered Soil1

  1. D. D. Evans and
  2. Gaylen Ashcroft2

Abstract

Abstract

The effect of a restricting layer (1 foot thick) on the flow of water to drain tiles has been evaluated by the relaxation method using a digital computer to perform the calculation. The following factors were varied alone and in combination: (a) depth to the restricting layer, (b) relative conductivity of the restricting layer to the surrounding soil, and (c) the depth of the drain. For all cases, a constant hydraulic head was assumed along the soil surface and within a gravel envelope surrounding the tile. An impermeable layer was considered to exist at 7 feet.

Drain flux was calculated for each case and compared to give the relative effectiveness of the drains at the selected depths. There is nearly a linear relationship between drain flux and depth of drain when the relative conductivity of the restricting layer to the surrounding soil is 1:10. For 1:100 and 1:1000 conductivity ratio cases, drain flux is nearly independent of depth. The surface intake rate distribution is presented for several cases. The calculations show that a sizeable tension extending over a large portion of the soil profile would be expected for several of the cases.

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