Soil Erosion & Sedimentation Control Training - Unit 4

19 Questions | Total Attempts: 195

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Soil Erosion & Sedimentation Control Training - Unit 4 - Quiz

Study exam for the Soil Erosion and Sedimentation Control Training - Unit 4


Questions and Answers
  • 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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