1 Introduction</h5> In situ determination of soil hydraulic properties (sorptivity, S , and hydraulic conductivity, K ) is a fundamental requirement of physically based models describing field infiltration and runoff processes. Over the last two decades, the tension disc infiltrometers ( Perroux and White, 1988 ) have become popular devices for in situ estimates of K and S . This instrument consists of a disc base covered by a membrane, a graduated water-supply reservoir and a bubbling tower with a moveable air-entry tube that imposes the pressure head at the cloth base. The cumulative infiltration curve is measured from the water level drop in the reservoir. The diameter of the disc base can vary from the 25 cm proposed by Perroux and White (1988) to the 3.2 cm used by Madsen and Chandler (2007) for microtopography studies. Correct measurements of the water infiltration with the tension infiltrometer require the disc base to be completely in contact with the soil surface. To achieve this connection, Perroux and White (1988) recommended trimming any vegetation within the sample to ground level and covering the soil with a material with high hydraulic conductivity (contact sand layer). Although this procedure allows infiltration measurements
Journal of Hydrology – Elsevier
Published: Aug 1, 2015
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