The
flowmeter method provides a simple approach for determining the vertical profile of
relative hydraulic conductivity in porous media or flow through fractured rock. Flow data
recorded at discrete positions in screened wells or uncased boreholes provide the basis
for computing the hydraulic conductivity.
Typical Profile of Flow Rates
Ambient flows and flows recorded during pumping produce a net induced
profile.
The Procedure
Ambient flows (i.e., naturally occurring) are first recorded throughout the
well at discrete depths. Then, while water is being pumped from near the top of the well
at a constant rate, flow rates are again recorded at the same depths throughout the well.
Profile of Relative Hydraulic Conductivity
A vertical profile of relative hydraulic conductivity is computed from
the net induced flow data shown above.
The net
induced flows are computed at discrete intervals to determine a profile of hydraulic
conductivity at each depth of the well.
