Shared Flashcard Set

Details

Chapter 11 - Ground Water
Midterm Number II
27
Geology
Undergraduate 1
10/21/2009

Additional Geology Flashcards

 


 

Cards

Term
ground water
Definition
the water that lies beneath the ground surface, filling the pore space between grains in bodies of sediment and clastic sedimentary rock, and filling cracks and crevices in all types of rock.
Term
porosity
Definition

the percentage of rock or sediment that consists of voids or openings

a measurement of a rock's ability to hold water.

 

Term
permeability
Definition

the capacity of a rock to transmit a fluid such as water or petroleum through pores and fractures.

ease of water to flow

Term
saturated zone
Definition
the subsurface zone in which all rock openings are filled with water
Term
water table
Definition
water level inside the well that marks the upper surface of the saturated zone
Term
unsaturated zone
Definition
above the water table where not all the rock openings are filled with water.
Term
perched water table
Definition
the top of a body of ground water separated from the main water table beneath it by a zone that is not saturated.
Term
aquifer
Definition
a body of saturated rock or sediment through which water can move easily.
Term
unconfined aquifer
Definition
has a water table because it is only partly filled with water.
Term
confined aquifer
Definition
completely filled with water under pressure and is usually separated from the surface by a relatively impermeable confining bed, or aquitard, such as shale.
Term
recharge
Definition
addition of new water to the saturated zone
Term
cone of depression
Definition
water is pumped from a well, the water table is typically drawn down around the well into a depression shaped like an inverted cone.
Term
drawdown
Definition
tends to change the direction of groundwater flow by changing the slope of the water table.
Term
spring
Definition
a place where water flows naturally from rock onto the land surface.
Term
gaining streams
Definition
they receive water from the saturated zone
Term
losing streams
Definition
they are losing water to the saturated zone.
Term
caves
Definition
naturally formed, underground chambers.
Term
speleothems
Definition
deposits of calcite built up in caves by dripping water
Term
stalactites
Definition
icicle like pendants of dripstone hanging form cave ceilings.
Term
stalagmites
Definition
cone shaped masses of drip stone formed on cave floors, generally directly below stalactites.
Term
sinkholes
Definition
closed depressions found on land surfaces underlain by limestone
Term
karst topography
Definition
an area with many sinkholes and cave systems beneath the surface
Term
petrified wood
Definition
develops when porous buried wood is either filled in or replaced by inorganic silica carried in by ground water
Term
geodes
Definition
partly hollow, globe shaped bodies found in some limestones, and locally in other rocks
Term
hot springs
Definition
springs in which the water is warmer than human body temp
Term
hydraulic head
Definition
equal to elevation of drop plus water pressure of drop on the drop
Term
hydraulic gradient
Definition
difference in head between two points divided by the distance between the two points.
Supporting users have an ad free experience!