Soil Erosion & Sedimentation Control Training - Unit 2

20 Questions | Total Attempts: 127

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Soil Erosion & Sedimentation Control Training - Unit 2

Study exam for the Soil Erosion and Sedimentation Control Training - Unit 2


Questions and Answers
  • 1. 
    Runoff is rain the does not _________________ into the soil.
    • A. 

      Melt

    • B. 

      Infiltrate

    • C. 

      Absorb

    • D. 

      Erode

  • 2. 
    Without proper planning, construction generally results in an _________________ in runoff.
    • A. 

      Decrease

    • B. 

      Increase

    • C. 

      Overflow

    • D. 

      Underflow

  • 3. 
    An increase in runoff generally results in an increase in the amount of ____________ generated.
    • A. 

      Vegetation

    • B. 

      Compaction

    • C. 

      Sediment

    • D. 

      Infiltration

  • 4. 
    Runoff is generally increased during and after construction due to:  (choose 3)
    • A. 

      Surface roughing

    • B. 

      Grading removes vegetation

    • C. 

      Grading compacts the soil

    • D. 

      Staging construction activities

    • E. 

      Construction increases the amount of impervious area

  • 5. 
    Several construction practices that minimize runoff and control erosion are: (choose 3)
    • A. 

      Grading to remove vegetation

    • B. 

      Seed and mulch all bare areas

    • C. 

      Grading to compact the soils

    • D. 

      Staging construction activities

    • E. 

      Divert runoff around the graded area

  • 6. 
    Several construction practices that minimize runoff and control erosion are: (choose 2)
    • A. 

      Preserve vegetative buffer areas

    • B. 

      Construct more impervious areas

    • C. 

      Surface roughening

    • D. 

      Construct check dams

  • 7. 
    ______________, sometimes called phasing is part of scheduling.  This is where grading and stablization are finished in one area before proceeding to the next.
    • A. 

      Roughening

    • B. 

      Compacting

    • C. 

      Staging

    • D. 

      Mulching

  • 8. 
    Care must be taken not to exceed ______________ that will erode the diversion channel.
    • A. 

      Levels

    • B. 

      Velocities

    • C. 

      Density

    • D. 

      Infiltration

  • 9. 
    Overland flow that is diverted must be disposed of without causing ___________.
    • A. 

      Roughening

    • B. 

      Sedimentation

    • C. 

      Erosion

    • D. 

      Compaction

  • 10. 
    Runoff may be disposed of onto ________________ vegetation.
    • A. 

      Well-established

    • B. 

      Well-maintained

    • C. 

      Slow-growing

    • D. 

      Dry

  • 11. 
    ____________  ________________  structures are used to carry runoff from one level to another.
    • A. 

      Silt fencing

    • B. 

      Check dams

    • C. 

      Grade stabilization

    • D. 

      Sedimentation control

  • 12. 
    ____________ occurs when water erodes small channels under or along the side of a water conveyance structure.
    • A. 

      Piping

    • B. 

      Rilling

    • C. 

      Sheeting

    • D. 

      Roughening

  • 13. 
    ______________   _____________  is/are often used in roadside ditches to reduce the velocity of water.
    • A. 

      Grade compaction

    • B. 

      Surface roughening

    • C. 

      Stabilization structures

    • D. 

      Check dams

  • 14. 
    The center of the check dam should always be _________________ than the outside edges to prevent scouring around the structure.
    • A. 

      9 inches lower

    • B. 

      1 ft lower

    • C. 

      3 inches lower

    • D. 

      3 inches higher

  • 15. 
    The size of the stone used in check dams should be _____________ as slope and/or velocity increases.
    • A. 

      Increased

    • B. 

      Decreased

  • 16. 
    When anticipated channel velocities are too great to establish grass, one may have to use erosion control ___________ or ___________   ____________  mats
    • A. 

      Riprap or turf reinforcement

    • B. 

      Blankets or turf reinforcement

    • C. 

      Riprap or silt fencing

    • D. 

      Concrete or rock gabions

  • 17. 
    For extremely high velocities, it may be necessary to line the whole channel with __________, _____________, or  ______________.
    • A. 

      Riprap, rock gabions, or concrete

    • B. 

      Blankets, turf or mats

    • C. 

      Rocks, grass or sticks

  • 18. 
    The most effective and least expensive way to prevent wind erosion is to keep the area covered with _________________  or with securely anchored  ___________.
    • A. 

      Blankets, turf mats

    • B. 

      Vegetation, mulch

    • C. 

      Silt fencing, riprap

  • 19. 
    Other methods used to control wind erosion include:
    • A. 

      Keeping the soil moist

    • B. 

      Spraying chemical binders on the soil surface

    • C. 

      Covering area with erosion control blankets

    • D. 

      Planting fast growing grass

    • E. 

      Placing snow fence perpendicular to the prevailing wind direction

  • 20. 
    To be effective, all control measures must be periodically ___________, _____________, and/or replaced when necessary.
    • A. 

      Inspected, maintained

    • B. 

      Surveyed, reevaluated

    • C. 

      Inspected, stablized

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