of Earth Science |Northeastern
Objectives #12 (October 9,
the end of today's class, you
should be able to do the following:
v Darcy's Law
v Flow Nets
- Use a Darcy tube to investigate hydraulic conductivity,
hydraulic head, and hydraulic gradient.
- Use Darcy's Law.
- Read hydraulic head values in piezometers and use them to
construct a flow net.
v The NEIU Darcy Tube:
- With a group, set up the Darcy
Tube by creating a discharge through it, and measure the
discharge. Use the piezometers to monitor hydraulic gradient
during the experiment. (Run at least three trials.)
- Use Darcy's Law to calculate
the hydraulic conductivity of the sediment filling the tube.
Ground Water Model: You may work individually or with a group
on this part.
- Alter one aspect of the
experimental set-up, and repeat the experiment (again running three
trials). Compare answers and speculate on causes of any
differences or discrepancies.
- On your flow net, be
sure to include flow
lines and hydraulic
head contours (equipotential lines). Label the contour
lines with their hydraulic head value. Use a consistent contour
interval! Put arrows on the flow lines to show direction of flow.
- Make sure
flow lines and contour lines cross each other at right angles.
© 2007 Laura L.
Last updated October 9, 2007.