Monitoring wells above and below the perma-
ing at CRREL, that minimizes the restrictions to
frost were installed and developed following stan-
water movement, keeps finer sediment from infil-
dard procedures. Each monitoring well was
trating the well, and permits in-situ measurements
drilled to a specified depth, at which a 3-m length
with a prototype ground water flow system (Fig.
of well screen was installed. All monitoring wells
9). The well screen is ~2-in. (5 cm) i.d., continuous
have a well screen, evaluated by laboratory test-
wire wrap, stainless steel with 0.060-in. (15-mm)
a. CRREL-modified flow sensor.
b. Electronic circuitry and data logger of the flow system.
Figure 9. Ground water flow monitoring system.
8
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