of Earth Science |Northeastern
Daily Objectives #16 (October
Lab #7: Flow nets.
By the end of today's class, you
be able to do the following:
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
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
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
Boundaries: constant head, impermeable (no flow), water table
v Using data from
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.
of Earth Science | Northeastern
© 2005 Laura L.
Last updated October 31, 2005.