Variable Drainable Porosity in Drainage Design

by Ashim K. Bhattacharya, Asst. Prof.; Engrg. Div., Indian Agr. Research Inst., New Delhi, India,
Robert S. Broughton, (M.ASCE), Prof.; Agr. Engrg. Dept., Macdonald Coll. of McGill Univ., Ste. Anne de Bellevue, Quebec, Canada,

Serial Information: Journal of the Irrigation and Drainage Division, 1979, Vol. 105, Issue 1, Pg. 71-85

Document Type: Journal Paper


Field and laboratory investigations were done to study the dependence of drainable porosity on the suction in two different types of soil. Empirical nonlinear relationships were developed between the two. These relations were different for the sand and the clay soils. The relations were integrated between various limits to obtain the volume of water drained from saturated soil columns for different water table drawdowns. The results thus obtained were used to derive water-table depth-transient water content relations for soil columns of known lengths. These relations can be used to predict water-table depth from the known value of transient water content in a soil column, in the water balance approach for subsurface drainage design. The effect of depth of installation of subsurface drains on the soil moisture depletion in coarser soils is examined.

Subject Headings: Soil water | Drainage | Water table | Subsurface drainage | Field tests | Clays | Columns | Water content

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