charbeneau, 2000. porosity. figure 15.1 types of porous media freeze and cherry, 1979. n = v v / v t...
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Charbeneau, 2000.
porosity
Figure 15.1
Types of Porous Media
Freeze and Cherry, 1979.
n = VV / VT = Vol Voids / Total Vol
Bedient et al., 1999.,
Porosity - not good indicator of flow
Freeze and Cherry, 1979.
= pressure headz = elevation headh = total head
Pressure and Elevation Heads - Field
Two Confined Aquifers with Different Heads
Charbeneau, 2000.
Groundwater will tend to flow from the top aquifer to the bottom aquifer.
We can’t make any conclusion about horizontal head gradients from this picture.
Horizontal and Vertical Head Gradients
Freeze and Cherry, 1979.
Other Aquifer Features
The Major Aquifers of Texas
Carrizo-Wilcox EdwardsGulf Coast
Ogallala
Recharge
Natural• Precipitation• melting snow• Infiltration by
streams and lakes
Artificial• Recharge wells• Water spread over
land in pits, furrows, ditches
• Small dams in stream channels to detain and deflect water
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