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Soils formed on glacial tills present potential drainage problems under irrigation. Because the hydraulic conductivity of the till substrata is much lower than that of the overlying soil, downward movement of water is retarded and water tables develop. Moreover, the inherent salinity of the glacial material is such that an upward water flow can result in accumulation of soluble salts in the surface soils. According to the United States Bureau of Reclamation (7), unfavorable drainage characteristics make glacial till soils un desirable for irrigation. However, some successful irrigation developments in Southern Alberta that have been irrigated for over 50 years show no apparent land deterioration (2). A short five-month irrigation season with a consequently long drainout period and an annual precipitation ranging from 13 to 63 cm have influenced the need and the desirability to drain irrigated soils in Alberta. The present study was undertaken to determine the influence of normal irrigation practices on the water table behaviour in soils formed over glacial till.
water table fluctuations in glacial till soils as influenced by irrigation
Rapp, E. and J.C. van Schaik 1971. WATER TABLE FLUCTUATIONS IN GLACIAL TILL SOILS AS INFLUENCED BY IRRIGATION. Canadian Agricultural Engineering 13(1):8-12.
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