Abstract
Soil physical properties determined on six fine-textured soil types near Brampton and Chatham were used to solve and evaluate formulae for the depth and spacing of tile drains proposed by Hooghoudt, Walker, Slater, and Dumm. At the Chatham site, measurements of water-table drawdown between tile drains were recorded to compare with Neal's water-table observations of adequate drainage.A wide difference in soil properties was exhibited between the two study sites. None of the formulae results of spacing agreed precisely. Causes for discrepancies between the results were shown to be due to technical differences in applying data to the formulae and to inherent differences in derivation of the formulae. Data are presented showing the need for a physical criterion of adequate drainage.
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