Evaluation of an air-entry permeameter - for use in investigations of groundwater flow beneath flood embankments

Watkins, D. (1987) Evaluation of an air-entry permeameter - for use in investigations of groundwater flow beneath flood embankments. Technical Report. Hydraulics Research Wallingford.

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Abstract

An air-entry permeameter for the in-situ measurement of the coefficient of permeability of soils has been constructed and tested at Hydraulics Research. The problems involved with in-situ permeability measurements on natural soils have been discussed, particularly in the context of groundwater flow beneath flood embankments. The air-entry permeameter has been examined as an alternative to other existing techniques. Reasons to explain some of the problems encountered have been proposed. Attempts to modify the equipment have been explained. Various testing techniques have been briefly described and some of their relative merits discussed. A comparison of the results with those derived from other methods have been made and discussed. Finally, the conclusions of the work have been brought into the context of the use of the results by engineers in order to evaluate the potential for groundwater flow beneath flood embankments. The views expressed in this report do not necessarily reflect either the policies or the opinions of the commissioning agency.

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