Department of Earth Science |Northeastern Illinois University

ESCI 337
Fall, 2007

Daily Objectives #14 (October 16, 2007)                                        Dr. Sanders

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

  • Distinguish between confined aquifers and unconfined aquifers.
  • Recognize and delineate hydrostratigraphic units.
  • Explain the difference between lithostratigraphic units and hydrostratigraphic units.
v Flow Nets
  • Identify boundaries to a flow system, and for the first three listed below, tell the relationship between the boundary and flow lines, and the boundary and equipotential lines:
    • no-flow (impermeable) boundaries:
      • hydrostratigraphic
      • hydrodynamic
    • water table boundary
    • constant head boundaries
    • constant flow boundaries (rarely used in modeling natural systems).
v Hydrogeologic Maps and Cross Sections
  • Use water levels in wells and/or piezometers, and flow system boundaries, as the basis for drawing water level maps and flow nets.
  • Use Darcy's Law to calculate flow through an area illustrated on a flow net.
  • Find borehole data for Illinois, and use it to delineate hydrostratigraphic units and construct hydrogeologic cross sections.

Today's Agenda:

v Darcy Tube: Debrief the Darcy tube exercise.

v Hydrogeologic Maps and Cross Sections
v Flow Nets
v Finding and Using Subsurface Data
Department of Earth Science | Northeastern Illinois University

© 2007 Laura L. Sanders.  Last updated October 16, 2007.