Objectives 12

Department of Earth Science |Northeastern Illinois University

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

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.