Department
of Earth Science |
Northeastern
Illinois University
PRINCIPLES
OF HYDROGEOLOGY
ESCI
337
Fall,
2005
Daily Objectives #16 (October
31, 2005)
Dr. Sanders
Lab #7: Flow nets.
By the end of today's class, you
should
be able to do the following:
v Tell
what causes
ground water to flow in an aquifer.
v Given piezometer data,
determine the total hydraulic head, the elevation head, and the
pressure head at a point.
v Use piezometers to determine flow directions in a Darcy
tube, and use flow directions to determine relative water levels in
piezometers.
v Sketch a cross sectional view of three piezometers that
tap an aquifer at different depths, but with their openings in a
vertical line. Sketch the relative positions of water levels in
the three piezometers in four situations: Water in the aquifer at that
location is A) flowing downward, B) flowing upward,
C) flowing laterally (horizontally), and D) not flowing.
v Define the meaning of the term water
table.
v Sketch flow system maps (flow
nets), including the following features in proper relationship to each
other. Explain what each term means.
a) Flow lines
b) Equipotential
(contour) lines
c)
Boundaries: constant head, impermeable (no flow), water table
v Using data from
piezometers,
draw a flow net in cross section, showing where the water table is.
v Use a flow net to determine
hydraulic gradient, flow velocity, and discharge through an aquifer.
Department
of Earth Science | Northeastern
Illinois
University
© 2005 Laura L.
Sanders.
Last updated October 31, 2005.