Soil Erosion & Sedimentation Control Training - Unit 4
Study exam for the Soil Erosion and Sedimentation Control Training - Unit 4
- 1.Sediment control should not be used as a _____________________ for erosion control.
- A.
Restriction
- B.
Method
- C.
Substitute
- D.
Motivation
- 2.Sediment control can be either _______________ or ______________.
- A.
Silt fencing, straw bales
- B.
Vegetative, structural
- C.
Elevation contours, trenching
- D.
Grading, nonwoven geotextile fabric
- 3.Although the required width of a filter strip will vary depending on the slope ___________ and ____________, it should be a minimum width of ________________ feet.
- A.
Length, steepness, 20-25
- B.
Roughness, length, 50-55
- C.
Smoothness, steepness, 10-15
- 4.Dense _______________ provides the best filtration.
- A.
Stone
- B.
Grass
- C.
Brush
- D.
Soil
- 5.Structural practices must be used when __________________ practices are not sufficient to control sediment.
- A.
Vegetative
- B.
Structural
- C.
Erosion
- 6.________________ and ________________ are commonly used along the perimeter of small graded areas to prevent off-site sedimentation.
- A.
Trenches, stone mats
- B.
Crushed stone, geotextile fabric
- C.
Silt fences, straw bales
- 7.____________________ are superior to straw bales for perimeter controls.
- A.
Silt fences
- B.
Trenches
- C.
Elevation contours
- D.
Crushed stones
- 8.Silt fences should always be trenched in a minimum of __________ inches and installed along the same __________________ across the slope.
- A.
12, steepness
- B.
6, elevation contour
- C.
9, height
- D.
3, elevation
- 9.Major disadvantages with using straw bales are:
- A.
Very little water will pass through them
- B.
Animals eat them
- C.
Deteriorate rapidly
- D.
Very time consuming to trench them in
- E.
Not cost effective
- 10.Tracking can be minimized by restricting vehicular traffic to designated areas. All vehicles should pass over a bed of ___________________ at least _______ feet in length.
- A.
Crushed rock or stone, 50
- B.
Crushed glass, 40
- C.
Stone matting, 30
- 11.______________________ should be placed on the ground prior to placing the crushed rock or stone when attempting to minimize tracking from vehicular traffic.
- A.
Straw
- B.
Nonwoven geotextile fabric
- C.
Sod
- D.
Silt fencing
- 12.To effectively control sediment, basins should be at least ______ times as long as wide.
- A.
2
- B.
4
- C.
3
- D.
6
- 13.The amount of sediment removed in basins is dependent upon:
- A.
Type of soil in the drainage area
- B.
Time the water remains in the basin
- C.
Velocity of the water flow
- D.
Size and density of sediment particles
- E.
Placing a gravel filter in front of or around the drain inlet
- 14.When designing basin volumes, the engineer must take into account:
- A.
Anticipated storm event
- B.
Velocity of the water flow
- C.
Size of the drainage area
- D.
Time that the water remains in the basin
- E.
Type of soil in the drainage area
- 15.The most common way to discharge water from a basin is through a _______________ pipe connected to a horizontal discharge tube.
- A.
Vertical riser
- B.
Perforated
- C.
Dissipating
- D.
Outlet
- 16.Often the riser pipe is ________________ to allow the water to drain below the top of the pipe.
- A.
Filtered
- B.
Perforated
- C.
Lined
- D.
Protected
- 17.Energy ________________ are often required at the basin outlet to prevent scouring.
- A.
Dissipaters
- B.
Minimumizer
- C.
Filter
- D.
Damper
- 18.All storm drain _____________ must be protected during construction.
- A.
Risers
- B.
Grates
- C.
Inlets
- D.
Pipes
- 19.Drain inlets can be protected by:
- A.
Covering with straw bales
- B.
Placing a gravel filter in front of or around the drain inlet
- C.
Sealing with an impervious material
- D.
Installing silt fence around the perimeter of the drain inlet
- E.
Wrapping the grate with geotextile materials
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