1. When the hydraulic conductivity is a function of (varies with) location, the
ID: 288044 • Letter: 1
Question
1. When the hydraulic conductivity is a function of (varies with) location, the aquifer is said to be: a. homogeneous b. isotropic c. anisotropic d. heterogeneous 2. Hydrogen bonding of water is often cited as the cause for which of the following phenomenon. Lakes freezing from the surface down. The ability of small insects to walk on water The existence of all three phase of water under normal environmental conditions. None of the above All of the above a. b. c. d. e. 3. The of a single fracture is proportional to the aperture (b) raised to what power (b") n=3 n=4 c, d, . Porosity is primarily dependent upon a. Grain size b. Grain packing c. Sorting d. (b) and (c) 5. Land subsidence is most likely to occur under which of the following conditions: a. b. c. d. groundwater withdrawals from crystalline bedrock groundwater withdrawals from interbedded sand and clay diminished recharge diminished streamflowExplanation / Answer
ANSWER 1
when hydraulic conductivity is a function of location , then the aquifer is said to be HETEROGENEOUS .
therefore answer is d .
When lithology of geological formation varies significantly in both horizontal and vertical plane , then hydraulic conductivity will be different for different location . that is hydraulic conductivity depends on position within the formation . hence the aquifer is heterogeneous .
ANSWER 2
Hydrogen bonding of water is often cite as the cause for which of the following phenomenon
Answer is (a) lakes freezing from the surface down .
In the ice each hydrogen atoms in one water molecule form weak hydrogen bonds with the top of oxygen atom of two other water molecules.
ANSWER 3
The hydraulic conductivity of a single fracture is proportional to the aperture (b) raised to power of 3
Therefore answer is c
ANSWER 4
Porosity is primarily dependent upon Grain packing and sorting
Therefore answer is d
Different types of grain packing have different porosity value . example
For cubic packing = 0.476
For hexagonal packing = 0.395
And also for well sorting grain porosity is low and for bad sorting grain porosity is high.
ANSWER 5
Land subsidence is most likely to occur under which of the following condition
Answer is b
That is Land subsidence is most likely to occur due to the groundwater withdrawals from interbeded sand and clay . this is because clay composed of platy grains . those grains are randomly deposited during deposition . those randomly oriented sediment grains have a lot of room between then to store water . but when groundwater level decline to historically low level , then those randomly oriente sediments are rearranged into stacks
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