An analysis of the effect of the vertical fissuring in mole-drained soils on drain performances |
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Authors: | EG Youngs |
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Affiliation: | Soils Division, Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ Great Britain |
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Abstract: | Numerical solutions of the seepage equation of groundwater flow were used in an analysis of the effect on drain performance of the herring-bone pattern of vertical fissuring, with fractures fanning out from the central slit, in mole-drained soils. Drain performances were assessed from values of the dimensionless parameter , where Em is the ‘seepage potential’ at the position of maximum water-table height when the steady rainfall is q and the drain spacing is 2D. Wm decreased with increase in the length of the fractures and, to a lesser extent, with decrease in the spacing of them, showing that the fracturing enables a mole-drainage system to cope with higher rainfall rates and to produce more rapid water-table drawdowns. |
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