of Earth Science |Northeastern
Objectives #8 (September 20,
the end of today's class, you
should be able to do the following:
v Water Flow and Water Table
v Properties of Porous Materials
what makes water flow.
"water table", "saturated zone", and "vadose zone" using the concept of
atmospheric pressure, and including the capillary fringe in your
v Hydraulic Head
- Define the following terms, using appropriate units of
conductivity and permeability.
- Characterize rocks and sediments in terms of their
hydraulic conductivity and permeability,
giving typical ranges of values of these properties for each type of
rock and sediment.
- Explain the difference between hydraulic conductivity and
the term hydraulic head
and describe its two components.
the effect that hydraulic head has on the flow of water.
v Water Table: Discuss
the meaning of the terms "water table", unsaturated (vadose) zone,
saturated (phreatic) zone, and capillary zone (capillary fringe),
they relate to atmospheric pressure and pressure of water in the pores.
v Homework #2: Present your work.
Present the results of your investigations into the question
assigned to you for Homework #2.
Discuss what makes
water flow and how that relates to the concept of hydraulic head.
Determine the hydraulic head at various points in a cross section
illustrating a shallow ground water system. (Click
here to get the worksheet.)
- Chris, Bisrat, and Ken: What is
the effect of tube diameter on flow velocity in Bucket-to-Bucket
- Jeaneth, Alex, and Renee: What
is the effect of grain sorting on how
much water drains out of sediment in Draining Work?
- Melissa, Jeff, and Linda:
the effect of volume of water in the upper bucket on flow rate in
- Hossein, Kristine, and Barb:
What makes the water flow in Bucket-to-Bucket transfer?
v Water Flow--Lab Explorations, continued:
Debrief the "Darcy
Discovery" exploration we did last time.
v Properties of Porous Materials: Define these properties of porous
materials: hydraulic conductivity
and permeability. Explain the difference between them.
Write formulas to express
each quantity. Give a typical range of values for each property
in various rocks and sediments.
© 2007 Laura L.
Last updated September 20, 2007.