Abstract
Two pore water samplers were designed for the purpose of incorporating a lysimeter into the casing of a monitoring well and to provide multiple sampling capabilities in a single retrievable section. A sleeve lysimeter was fabricated for use with a monitoring well and provided multiple sampling points to depths of about 15 m. The casing lysimeter provides multiple sampling points to depths in excess of 15 m by incorporating several lysimeters with threaded PVC well casing. The minimum vertical distance between the porous sections of two lysimeters was calculated using a linearized solution of the matric potential and stream functions for various soils at finite and infinite depths. A vertical spacing not less than 20 times the lysimeter radius (20 ro) is appropriate for most soils. The radius of sampling influence is maximized if the borehole diameter is only slightly burger than the lysimeter, and a fine-grained silica flour (grain size .032 mm) is used for an optimum backfill around the porous section of the lysimeter.
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