Transcript Class11-Groundwater

Water Stores on the Earth
The Hydrologic Cycle
From precipitation to
groundwater
Infiltration
Percolation/leaching
Groundwater Flow
Soil Water
Soil Water
Allowing Flow: Porosity & Permeability
Flow is controlled by
Permeability (and
tortuosity)
Storage is controlled
by Porosity
The Water Balance
The Soil-Water Balance Equation
Figure 9.4
Sample Water Budget
Figure 9.11
US Water Budget
Figure 9.20
Groundwater
Seasonal Changes
Aquifers
Aquifers and Porosity
Artesian Water
Water Towers
Water deep in the crust
How Do Geysers Work?
http://www.eepybird.com/exp214.html
Filling and
Heating
Water under
Pressure has
Higher boiling
Point:
Pressure cooker
Superheated
water begins to
boil
Expanding steam
steam
Filling and
Heating
Entire column
Near boiling, but
mostly hotter than
100°C
Boiling releases
Pressure & boiling
point decreases.
Boiling runs away
Empty pipe
Water goes somewhere
And pressure is released
Wells
The Ogallala Aquifer
Groundwater quality
Groundwater Contamination
Other
Groundwater
Problems