DEQ (Section 2)

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  1. When developing a runoff and SESC strategy, remember that ______ and ______ ______ control is more effective and cost efficient than ______ control.
    • runoff
    • soil erosion
    • sediment
  2. Without proper planning, construction generally results in an ______ in runoff.
    Increase
  3. ______ controls rarely reduce ______ or ______.
    • Sediment 
    • runoff
    • erosion
  4. Fine sediment particles, such as ______ and ______, are difficult or impossible to capture with standard ______ control techniques.  It is particularly important to emphasize ______ and ______ control on sites with fine textured soils.
    • Silts, clays
    • sediment
    • runoff
    • erosion
  5. List five construction practices that minimize runoff and control erosion:
    • 1.) staging (phasing) - grading in a limited area is completed before proceeding with additional grading or earth change activities 
    • 2.) Vegetation - most effective
    • 3.) Surface roughening (scarification)
    • 4.) Diversions and channels - capture runoff and provide erosion control
    • 5.) Grade stabilization structures - carry runoff from one level to another (ex: Pipe Downdrains / chute or flume - flat or round bottomed ditch usually lined with concrete or asphalt
  6. List five sediment control practices:
    • 1.) Dewatering - removal of groundwater, surface water, or storm water from a site to allow construction to be done "in the dry."
    • 2.) Access and Exit roads
    • 3.) Sedimentation Basins 
    • 4.) Catch Basins
    • 5.) Storm drain inlet protection - (ex: silt sacks)
  7. ______, sometimes called ______ is part of scheduling.  This is where grading and stabilization are finished in one area before proceeding to the next area.
    Staging, phasing
  8. The slope of a diversion channel must be adequate to provide good positive ______ but not so great as to create water velocities that will ______ the diversion channel.
    • Drainage
    • erode
  9. Overland flow that is diverted must be disposed of without causing ______ or ______ ______ where it is undesirable.
    • Erosion
    • depositing sediment
  10. Runoff may be disposed of onto ______ - ______ vegetation.
    Well - established
  11. ______ ______ structures are used to carry runoff from one level to another.
    Grade stabilization
  12. ______ occurs when water erodes small channels under or along the side of a water conveyance structure.
    Piping
  13. ______ ______ are often used in roadside ditches to reduce
    the velocity of water.
    Check dams
  14. The center of the check dam should always be ______ ______ ______ than the outside edges to prevent scouring around the structure.
    9 inches lower
  15. The size of the stone used in check dams should be ______ as slope and/or velocity increases.
    increased
  16. When anticipated channel velocities are too great to establish grass, the channel can be lined with erosion control ______ or ______ ______ mats.
    • Blankets/mats
    • turf reinforcement
  17. Sediment basins should be at least ______ times as long as wide.  If this is not possible, ______ or ______ should be placed in the basin to increase the water's travel distance.
    • Four
    • baffles or convolutions
  18. ______ tends to settle rapidly in a sediment basin, but ______ and ______ sized particles may never settle out.
    • Sand
    • clay, silt
  19. Some methods used to control wind erosion include:
    a.) placing ______ ______ perpendicular to the prevailing wind direction
    b.) keeping the soil ______
    c.) spraying ______ binders on the soil surface
    • snow fence
    • moist
    • chemical
  20. To be effective, all BMP's must be periodically ______, ______, and/or ______ when necessary.
    • Inspected
    • maintained
    • replaced

Card Set Information

Author:
Ebusinger1298
ID:
320605
Filename:
DEQ (Section 2)
Updated:
2016-05-30 01:40:13
Tags:
Unit2
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Description:
DEQ Study Guide
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