The commonly accepted test methods of assessing geotextile hydraulic properties, both in isolation and in soil, are briefly reviewed. A test system with 3 different diameters (44, 93 and 193 mm), 2 types of pressure reading port ( extended, non-extended) and comprising six sets of apparatus has been designed and constructed. Details of an experimental study of some key factors of geotextile hydraulic property measurement in isolation and in soil are discussed. It is shown that the prefwred size of tube diameter for measuring the hydraulic property of geotextile in isolation (permittivity) is between fl-4 mm and 93 mm, and about 93 mm in soil/ geotextile system. There is also an indication that the quality of the test water is important to the test results obtained. Finally, it is shown that the combined method oflongterm flow rate, in conjunction with hydraulic gradient analysis along the soil column, can provide a more reliable prediction of the clogging potential for the tested geotextile/soil system.
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