of Earth Science |Northeastern
Daily Objectives #19 (November
Confined and unconfined aquifers; combining geology with flow
nets/water level maps
By the end of today's class, you
be able to do the following:
Draw a quantitatively accurate
net for flow beneath a dam, and use it to make calculations of
discharge below the dam. Answer the following questions
about the dam flow net:
o If the sediments have a hydraulic
conductivity of 0.28 m/day, and the dam is 200 m long going back into
the page, calculate the flow rate of water under the dam. (Give
your answer in units of cubic meters/day.)
o At Point A, what is the total
head? Elevation head? Pressure head?
v Evaluate other flow nets drawn by
your colleagues, pointing out specific good points and flaws.
v Describe the difference between
unconfined and confined aquifers, and given subsurface data, identify
Describe how geologic conditions relate to hydrogeologic
conditions. For example, what geologic conditions consitute a
no-flow boundary? constant head boundary? aquifer?
v Use published maps to investigate geologic conditions in
Well #10: Twp 38N, Range
8E, Section 33, Plot 4h. (This well is 82 ft deep.)
Well #11: Twp 38N, Range
8E, Section 33, Plot 5h. (This well is 59 ft deep.)
of Earth Science | Northeastern
© 2005 Laura L.
Last updated November 9, 2005.