Erosion and Sediment Control Exam Questions and
Answers
Soil Erosiom - -The process of detatchment and transport of sediment particles caused by
wind, rain, ice, and gravity. Erosion rates directly correspond to the percentage of bare soil
on a site.
-Sedimentation - -The deposition of soil particles
-Potential Problems Arising From Construction Related Activities - -Degradation to
downstream properties and waterways. Damage to new and existing infrastructure.
Nuisances: dust and mud tracked onto public streets
-E&SC Plan - -Used to show the location and size of the various ESC practices. Phase 1 =
Initial clearing and grading. Phase 2 = Finish grading and protection of site infrastructure.
-E&SC Narrative - -Provides supporting calculations. Includes information often
redundant to Feasibility Report: vicinity map, neighboring properties, soil types, critical
areas of concern.
-Factors Influencing Soil Erosion - -Rainfall frequency and distribution type; soil
properties (permeability/cohesiveness); topography; vegetation (ie surface cover)
-Silt Fence - -Proper installation requires that the fence be "keyed" into the soil. Maximum
drainage area of 0.25 ac/ 100 ft of fence. Maximum slope of 100 ft behind fence. VESCH Std.
& Spec 3.05. Minor swales where D.A < 1 ac and Q< 1cfs.
-Inlet Protection - -VESCH Std. & Spec 3.07. Maximum drainage area of 1 ac. VDOT #3,
#357, or #5 coarse aggregate. May be used in conjunction with silt fence (placed in
between stone and inlet)
-Construction Entrance - -VESCH std and spec 3.02. VDOT #1 coarse aggregate.
Dimensions: minimum 12' width, minimum 70' length, minimum 6" thickness
-Diversion Dikes - -VESCH 3.09. Used to direct flow away from vulnerable areas and into
stabilized traps, basins, or channels. Maximum drainage area of 5 ac. Minimum allowable
height of 18". Minimum base width of 4.5'.
-Temporary Slope Drain - -VESCH 3.15. Maximum allowable drainage area of 5 ac. Uniform
pipe diameter, f(drainage area). Entrance and outlet equipped with IP and OP.
-Outlet Protection - -VESCH 3.18. Sizing of the stone apron is a function of the computed
tailwater depth - mannings equation.
Answers
Soil Erosiom - -The process of detatchment and transport of sediment particles caused by
wind, rain, ice, and gravity. Erosion rates directly correspond to the percentage of bare soil
on a site.
-Sedimentation - -The deposition of soil particles
-Potential Problems Arising From Construction Related Activities - -Degradation to
downstream properties and waterways. Damage to new and existing infrastructure.
Nuisances: dust and mud tracked onto public streets
-E&SC Plan - -Used to show the location and size of the various ESC practices. Phase 1 =
Initial clearing and grading. Phase 2 = Finish grading and protection of site infrastructure.
-E&SC Narrative - -Provides supporting calculations. Includes information often
redundant to Feasibility Report: vicinity map, neighboring properties, soil types, critical
areas of concern.
-Factors Influencing Soil Erosion - -Rainfall frequency and distribution type; soil
properties (permeability/cohesiveness); topography; vegetation (ie surface cover)
-Silt Fence - -Proper installation requires that the fence be "keyed" into the soil. Maximum
drainage area of 0.25 ac/ 100 ft of fence. Maximum slope of 100 ft behind fence. VESCH Std.
& Spec 3.05. Minor swales where D.A < 1 ac and Q< 1cfs.
-Inlet Protection - -VESCH Std. & Spec 3.07. Maximum drainage area of 1 ac. VDOT #3,
#357, or #5 coarse aggregate. May be used in conjunction with silt fence (placed in
between stone and inlet)
-Construction Entrance - -VESCH std and spec 3.02. VDOT #1 coarse aggregate.
Dimensions: minimum 12' width, minimum 70' length, minimum 6" thickness
-Diversion Dikes - -VESCH 3.09. Used to direct flow away from vulnerable areas and into
stabilized traps, basins, or channels. Maximum drainage area of 5 ac. Minimum allowable
height of 18". Minimum base width of 4.5'.
-Temporary Slope Drain - -VESCH 3.15. Maximum allowable drainage area of 5 ac. Uniform
pipe diameter, f(drainage area). Entrance and outlet equipped with IP and OP.
-Outlet Protection - -VESCH 3.18. Sizing of the stone apron is a function of the computed
tailwater depth - mannings equation.
