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Unit 6 GroundWater Sytstm
Groundwater
25
Geology
Post-Graduate
03/08/2009

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Cards

Term
About What percentage of earth's water is available as fresh water?
Definition
3% or 2%
Term
How do most rivers and lakes maintain their water level?
Definition
By seeping ground water
Term
What is potable water
Definition
water that infitrated from surface sources; sutiable for consumption
Term
In regards to rocks and soils, compare pore space with Porosity?
Definition
Pore space is the space that is not occupied by matter; porosity is the amount of space
Term
What is the difference between permeability and porosity?
Definition
Permability is the capacity and ability to transmit water;
Term
Describe the volume of groundwater associated with very large underground rivers and lakes?
Definition
its total fake
Term
Are there large areas of land on Earth that have no ground water?
Definition
nope
Term
At what depth is most usable groundwater found?
Definition
less than 1,000 feet
Term
How does a perched aquifer differ from an unconfined aquifer? (reference extent of aquitard)
Definition
Perched is smaller it is above the main aquifer
Term
What types of sediments and rocks make the best aquifers?
Definition
sand
Term
what type of rocks and sediments make the best aquitards?
Definition
clay and silt
Term
what is the potential problem with the high plains (ogallala) Aquifer of the Texas panhandle? n Y
Definition
it is running out of water because most of its recharge zone is covered by clays
Term
Describe the water qualities of the Goliad formation near Sinton?
Definition
good water and preamability but privetly owned
Term
What is "hard water" and what effect does this have on hot water heaters and pipes?
Definition
water with dissolved calcite which can fill the pipes and heaters up with coatings of calcite
Term
What are some of the major contaminants of local area aquifers?
Definition
Arsenic, Uranium and Selenium
Term
Why would a town use more expensive water from a desalinaition plant?
Definition
it is a back up so they wont run out of water and when they need water
Term
what is Leach?
Definition
to dissolve and remove the soluble constituents of a rock or soil or trash or anything
Term
what is leachate?
Definition
A water solution produced by leaching that can enter an aquifer
Term
what is the cause of major ground subsidence around houston?
Definition
Drilling more water thant water can get in
Term
What is the host rock for most caves?
Definition
Limestone
Term
What are stalacites and Stalagmites
Definition
Stalacites are the ones hanging from roof and stalagmites are the ones on the floor
Term
When do sinkholes develop?
Definition
when the roof of a cavern caves or depresses in
Term
Describe required rainfall amounts needed for karst topography?
Definition
alot of rain and sinkholes
Term
Describe a geyser?
Definition
A Thermal spring that intermittently erupts steam and boiling water.
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