Daily
Objectives #12 (October 9,
2007)
Dr. Sanders
By
the end of today's class, you
should be able to do the following:
v Darcy's Law
Use a Darcy tube to investigate hydraulic conductivity,
hydraulic head, and hydraulic gradient.
Use Darcy's Law.
v Flow Nets
Read hydraulic head values in piezometers and use them to
construct a flow net.
Today's
Agenda:
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.
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.
v
Ground Water Model:You may work individually or with a group
on this part.
A flow
system has been established in the ground water model. Construct
a flow net of
the system using dye injection to show flow paths, and measuring
hydraulic heads in each of the piezometers. A
grid showing the piezometer locations appears here (jpg file).
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.