Study exam for the Soil Erosion and Sedimentation Control Training - Unit 4
Silt fences
Trenches
Elevation contours
Crushed stones
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Length, steepness, 20-25
Roughness, length, 50-55
Smoothness, steepness, 10-15
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Crushed rock or stone, 50
Crushed glass, 40
Stone matting, 30
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Vegetative
Structural
Erosion
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Risers
Grates
Inlets
Pipes
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Trenches, stone mats
Crushed stone, geotextile fabric
Silt fences, straw bales
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Stone
Grass
Brush
Soil
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Dissipaters
Minimumizer
Filter
Damper
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Restriction
Method
Substitute
Motivation
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Filtered
Perforated
Lined
Protected
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12, steepness
6, elevation contour
9, height
3, elevation
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Silt fencing, straw bales
Vegetative, structural
Elevation contours, trenching
Grading, nonwoven geotextile fabric
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Vertical riser
Perforated
Dissipating
Outlet
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2
4
3
6
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Very little water will pass through them
Animals eat them
Deteriorate rapidly
Very time consuming to trench them in
Not cost effective
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Covering with straw bales
Placing a gravel filter in front of or around the drain inlet
Sealing with an impervious material
Installing silt fence around the perimeter of the drain inlet
Wrapping the grate with geotextile materials
Type of soil in the drainage area
Time the water remains in the basin
Velocity of the water flow
Size and density of sediment particles
Placing a gravel filter in front of or around the drain inlet
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Anticipated storm event
Velocity of the water flow
Size of the drainage area
Time that the water remains in the basin
Type of soil in the drainage area
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