Objectives 1

Department of Earth Science |Northeastern Illinois University

PRINCIPLES OF HYDROGEOLOGY
ESCI 337
Spring, 2009

Daily Objectives #9 (February 10, 2009) Dr. Sanders

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

What makes water flow?

v Water Flow--Lab Explorations (continued from last time)

• Darcy Discovery: Explain the experimental results we got last time for our measurements of flow rates through different sediment samples. What were the experimental variables we kept constant for all the experiments? How would varying them affect the results?

• Explain the term discharge and give typical units of measurement.

v Explain the results we got last time with our experiment using the ground water model ("sand tank"). Observe the flow paths created by all the dye inputs. What makes water flow?

v Sketch the ground water flow model set-up (including the container and the sand). Add the hydrogeologic system: the lake, inflow, outflow, and water table. Highlight the boundaries to the flow system. Sketch flow lines.

v Sketch a new situation that we can create in the model. Predict how water will flow in this situation. Then, model it.

Hydraulic Properties of Rocks and Sediment

v In pairs, define and describe how one can measure the following properties:

            porosity (n)                                  specific yield (S_y)                        specific retention (S_r)
            intrinsic permeability (K_i)        hydraulic conductivity (K)

v Explain the relationship between specific yield, specific retention, and porosity.

v Explain the relationship between permeability and hydraulic conductivity.

v Tell in what units of measurement each of these properties is expressed.

v Give typical ranges of each of these hydraulic properties for various types of sediments, and explain any trends in the ranges.

Department of Earth Science | Northeastern Illinois University