Hydrology (Part A) Flashcards
The constant head permeability test is suitable for….and the falling head test is suitable for….
(1 word, 1 word)
Sands
Clays
Darcy’s law provides the following equation for the quantity of water flowing in unit time, q =
Aki
The coefficient of permeability (k) is defined as the….of flow induced by a hydraulic gradient of unity
(1 word)
Velocity
There are three basic types of in-situ permeability tests, name one of the tests….
Pumping test
Packer test
Constant head or falling head test in a borehole
The two common types of laboratory tests to determine shear strength of soils are….and….
(2 words, 1 word)
Shear box
Triaxial
State coulombs equation
Shear strength at failure = cohesion + normal stress x Tan (Phi)
Indicate which types of triaxial test would be most suitable when measuring parameters in connection with:
(A) long term stability
(B) short term stability
(A) drained
(B) undrained
The two parameters of shear strength are…and….
Angle of friction and cohesion
The falling head test is suitable for soils such as…and….
(1 word, 1 word)
Silts and clays
A medium sand would normally have a coefficient of permeability (k value) equal to…. m/s
(Number range)
1x10^-3 to 1x10^-4
The coefficient of permeability (k value) of a clay would normally be less than…. m/s
(Number)
1x10^-7
What is the water table? (Pore water pressure)
What is a typical example of a water table?
The water table is the point at which pore water pressure is equal to atmospheric pressure
An example would be any free water surface, such as a rivers surface
What is an aquifer?
An area of low permeability
I
What is the water table?
The point at which pore water pressure is equal to atmospheric pressure.
