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Soil 2124 Exam 4 Questions and Correct
Answers/ Latest Update / Already Graded
Mechanical/Engineering Measures
Ans: 1. Riprap
2. Terracing
3. Bioenginerring
4. Sediment Traps
5. Retention Ponds
Riprap
Ans: Large angular rocks may be laid at the bottom or the side
of channels where high water velocities may be expected
What kind of erosion counts for more than 40 percent of total soil loss
in some watersheds
Ans: Steam-Bank Erosion
Terracing
Ans: "Stairs-like" surface manipulation to reduce down-slope
runoff velocity and encourage retention of sediments
Not very common in the US
All rights reserved © 2025/ 2026 |
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Bioengineering
Ans: Use of vegetation to protect channels, reduce runoff
velocity and trap sediements
Sediment Traps
Ans: Traps are designed to:
1. Slow down runoff
2. Trap sediments
Retention Ponds/Sedimentation Basins
Ans: Ponds constructed down-slope of field which collects
runoff and allows sediments to settle prior to movement of
surface water off-site
Wind Erosion in the US Key facts
Ans: 1. Wind moves 40% of the soil transported by erosion in
the US
2. Problem in 75 million acres of land in the US
3. Up to 29 mg/ha of wind erosion-induced losses had been
recorded in New Mexico
All rights reserved © 2025/ 2026 |
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Three processes of wind erosion
Ans: Detachment, Transportation, and Deposition
Factors affecting wind erosion
Ans: 1. Wind velocity
2. Surface roughness
3. Soil properties
Wind Velocity
Ans: Areas with steady, prevailing winds are very prone to wind
erosion
Wind-carried sediments that strike the ground further increases
the detachment process
Threshold Velocity
Ans: 25 km/h at 12 inches above the ground
Soil Roughness
Ans: Smooth soil surface devoid of vegetative cover - more
susceptible to wind erosion
All rights reserved © 2025/ 2026 |
Soil 2124 Exam 4 Questions and Correct
Answers/ Latest Update / Already Graded
Mechanical/Engineering Measures
Ans: 1. Riprap
2. Terracing
3. Bioenginerring
4. Sediment Traps
5. Retention Ponds
Riprap
Ans: Large angular rocks may be laid at the bottom or the side
of channels where high water velocities may be expected
What kind of erosion counts for more than 40 percent of total soil loss
in some watersheds
Ans: Steam-Bank Erosion
Terracing
Ans: "Stairs-like" surface manipulation to reduce down-slope
runoff velocity and encourage retention of sediments
Not very common in the US
All rights reserved © 2025/ 2026 |
, Page |2
Bioengineering
Ans: Use of vegetation to protect channels, reduce runoff
velocity and trap sediements
Sediment Traps
Ans: Traps are designed to:
1. Slow down runoff
2. Trap sediments
Retention Ponds/Sedimentation Basins
Ans: Ponds constructed down-slope of field which collects
runoff and allows sediments to settle prior to movement of
surface water off-site
Wind Erosion in the US Key facts
Ans: 1. Wind moves 40% of the soil transported by erosion in
the US
2. Problem in 75 million acres of land in the US
3. Up to 29 mg/ha of wind erosion-induced losses had been
recorded in New Mexico
All rights reserved © 2025/ 2026 |
, Page |3
Three processes of wind erosion
Ans: Detachment, Transportation, and Deposition
Factors affecting wind erosion
Ans: 1. Wind velocity
2. Surface roughness
3. Soil properties
Wind Velocity
Ans: Areas with steady, prevailing winds are very prone to wind
erosion
Wind-carried sediments that strike the ground further increases
the detachment process
Threshold Velocity
Ans: 25 km/h at 12 inches above the ground
Soil Roughness
Ans: Smooth soil surface devoid of vegetative cover - more
susceptible to wind erosion
All rights reserved © 2025/ 2026 |
