Abstract
This article considers the use of restrictors in reducing the rate of flow when constant head and falling head in-situ permeability tests are carried out in cased boreholes installed in highly permeable soils. An appraisal is made of three types of restrictor, namely the fitted orifice plate, suspended plate and placed soil plug. On the basis of theoretical and practical considerations and some comparative data from a worked example it is concluded that the orifice plate and soil plug would have the widest application in practice. (Author/TRRL)
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