Stormwater Management Inspector Prep Questions And Answers
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Course
Storm Water Drainage
Institution
Storm Water Drainage
Stormwater Management Inspector Prep
Questions And Answers
How does sheet flow to a vegetated filter strip or conserved open space work? Filter strips
are vegetated areas that treat sheet flow delivered from adjacent impervious and managed turd
areas by slowing runoff velocities and allowing ...
, Stormwater Management Inspector Prep
Questions And Answers
-3ft. of VDOT #3 stone, underlain by filter fabric just below spreader
-vegetated receiving area must be stabilized
Construction sequence for conserved open space - no clearing, grading, heavy equipment
-protect area during construction
-prevent sediment discharge
-mark limits of disturbance
-drainage area stabilized
-grade with tracked vehicles
-install gravel diaphragm and/or level spreader
-mark filter boundaries
-keep vehicles out
-stockpile topsoil for later use
-divert construction runoff
-install gravel diaphragm and/or level spreader
-grade with tracked vehicles
-open to runoff once stabilized
, Stormwater Management Inspector Prep
Questions And Answers
Maintenance of Vegetated Filter Strips minimal; spring cleanup, regular mowing, check
dam repairs, and other methods of maintaining hydraulic efficiency
Grass channel design criteria -the bottom width of the channel should be between 4-8 feet
wide
-the channel side-slopes should be 3H:1V or flatter
-the maximum total contributing drainage area to any individual grass channel is 5 acres
-the longitudinal slope of the channel is <4%
-max flow velocity of channel must be <1ft/sec during a 1 inch storm event
-the dimensions of the channel should ensure that flow velocity is non-erosive during the 2-yr
and 10-yr design storm events and the 10-yr design flow is contained within the channel
Grass channel pretreatment -check dams
-tree check dams
-grass filter strip
-gravel or stone diaphragm
-gravel or stone flow spreaders
, Stormwater Management Inspector Prep
Questions And Answers
Check dams -Purpose: break-up slopes and increase time water stays in channel
max desired height 12-18 in
-averaging ponding depth: 12 in
-armoring may be needed downstream
-anchored into side slopes and bottom
-center weir to pass 10-year storm
-weep hole or similar drainage for dewatering, composed of wood/concrete/stone/other non-
erodible material
Grass Channel construction sequence -protect area during construction
-stabilize drainage area
-grade to final dimensions
-install check dams, pre-treatment
-soil compost amendments
-prepare planting holes
Soil Testing before Soil Compost Amendments 1st test:
-conducted every 5000 sq. ft. to determine soil properties
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