USBR ch 5 Flashcards
The investigation for a potential dam site primarily consists of three stages, or level of study. What are they?
a) appraisal
b) construction
c) feasibility
d) design investigations
e) personnel
a) appraisal
c) feasibility
d) design investigations
The primary criteria for riprap (riff raff) is quality and size?
T or F
True
Why are stream deposits a good source of concrete aggregate?
a) they are easy and inexpensive to excavate or process
b) streams naturally sort deposits
c) abrasion caused by stream transportation eliminates some of the weaker material
d) all above
d) all above
It is important to have an effective reservoir geologic map because the map is essential for planning and constructing the investigations
T or F
True
What do geological maps identify?
a) surrounding areas
b) rock units
c) street lights
d) both A and b
d) both A and B
Agricultural soil maps are useful for engineering purposes because they provide detailed soil data and information relating to drainage areas.
T or F
True
In construction of foundation and earthwork for dams, why are the physical properties of soil important?
a) height
b) unit weight
c) permeability
d) shear strength
e) appearance
b) unit weight
c) permeability
d) shear strength
What happens if soil and clay have as little as 10 percent of the particles in sand and gravel and are smaller than the No. 200 sieve size they will become saturated
T or F
False
In field classification, if the soil is gravel it can be identified as clean or dirty. When dirty mean that it has an appreciable amount of fines
T or F
True
Streak means in reference to rocks that the color of the fine powder of a material, obtained by rubbing it on the unglazed portion of a porcelain tile is known as its streak.
T or F
True
What are the mechanisms that develop soil deposits on the surface of soil?
a) water, ice, and heat
b) water, ice, and wind
b) wind, water and heat
c) none above
b) water, ice, and wind
The definition of moderately hard rock is that is cant be scratched with a knife or sharp pick with light or moderate pressure
T or F
False
What are the non-accessible exploration methods for subsurface materials?
a) auger drilling
b) core drilling
c) rotary drilling
d) all above
d) all above
A vane shear test is an in-place test to determine the undrained shear strength of a saturated cohesive soil
T or F
True
