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Drainage Flux in Permeable Soil Underlain by a Coarse-Textured Layer¹

ABSTRACT

Drainage from a permeable soil underlain by a coarse-textured layer is investigated. Simplified theory is used to develop a model relating the drainage flux at the base of the soil to the water storage in the soil. Despite significant hysteresis in the water retentivity curve of the overlying soil and in the hydraulic conductivity-pressure potential relationship of the coarse layer, hysteresis had little effect on the storage-flux relation. The model fairly successfully simulated field drainage as measured by a lysimeter and field profile water storage as found by neutron moisture probe measurements. The decline in the drainage flux after the profile has been wetted depends on the depth and retentivity of the soil and the hydraulic conductivity of the underlying coarse layer. To use the model only simple field measurements to find the storage-flux relationship are needed.

¹ Contribution from Plant Physiology Div., D.S.I.R.; and Soil Science Dep., Massey Univ., Palmerston North, New Zealand.

² Scientist, Plant Physiology Division, D.S.I.R.; Senior Lecturer, Soil Science Dep., Massey Univ.; and Director, Plant Physiology Division, D.S.I.R., Palmerston North, New Zealand, respectively.