Objectives #28

Department of Earth Science |Northeastern Illinois University

PRINCIPLES OF HYDROGEOLOGY
ESCI 337
Spring, 2004

Daily Objectives #28 (April 29, 2004) Dr. Sanders

Click here for a review sheet for Exam #3.

By the end of today's class, you should be able to do the following:

n Measure depth to water in a well.
n Share you answers to the flow net problem from last class.
n Share the flow net you constructed for the "sand tank".
n Share your predictions as to how changes to these variables in the sand tank would affect flow:

1) Increase/decrease the pumping rate out of the bottom of the tank. Increase/decrease the rate of flow into the top of the tank.	2) Keep the lake's water level the same, but make the lake larger by giving it a broader surface area. Change the slope of the hillside. Use sand with a higher/lower hydraulic conductivity.
3) Change the lake level by causing it to be lower/higher. Use colder/hotter water.	4) Keep the lake's water level the same, but scoop out sand to make it deeper. Put more sand in to make the hill higher, and raise the inflow so that water flows into the ground at the very top of the tank

n Share you predictions as to how altering variables in your numerical ground water model cause changes in a ground water system will affect flow through the system. Tell how the results changed, and the degree of change (high, moderate, low). Examine the effects of changes in the following variables:

1) * hydraulic conductivity (higher, lower) * thickness of the aquifer (thicker, thinner)	2) river levels: * higher levels, like in a flood * lower levels, like in a drought)
3) river levels (lower slope of the river surface, like if a dam were built a short distance downstream) porosity (higher, lower)	4) * recharge rate (higher, lower) * pumping rate (higher, lower)

n Complete the Student Assessment of Learning Gains (SALG).
n Complete the course evaluation.
n Take a copy of the "Peer Rating of Team Members" form, complete it at home, and turn it in on May 4.

Department of Earth Science | Northeastern Illinois University