Storm water Management Inspector Exam
Questions and Correct Answers | Newest Update
2026/2027 | Graded A+ | 100% Assured Pass.
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Terms in this set (145)
What are the types of disconnection 1) simple disconnection - rooftops and/or on-lot
allowed for rooftop disconnection? residential impervious surfaces are directed to
pervious areas
2) disconnection leading to an alternative runoff
reduction practice adjacent to the roof (ex: soil
compost amended filter path)
Why have a rooftop disconnection to -lot size too small
an alternative practice? -filter width is too narrow
-need more water quality credit
Functions provided by simple -annual runoff volume reduction
rooftop disconnection -total phosphorus mass load removal
-total nitrogen mass load removal
Alternative rooftop disconnection -soil compost-amended filter path
types -dry-well or french drain
-rain-garden//front yard bioretention
-rainwater harvesting//cistern
-stormwater planter
,How does sheet flow to a vegetated Filter strips are vegetated areas that treat sheet
filter strip or conserved open space flow delivered from adjacent impervious and
work? managed turd areas by slowing runoff velocities
and allowing sediment and attached pollutants to
settle and/or be filtered by the vegetation
Gravel diaphragm -pretreatment device
-maintains sheet flow
-not necessary if contributing drainage area is
solely turf
-trench is 2 ft. wide and 1 ft. deep
-runs on same contour at top of filter strip
-drop at least 3 inches
-fabric between gravel and soil
Engineered level spreader -forebay: max. 3ft. deep, transition to 1 ft. at level
spreader lip
-level spreader lip - concrete, wood, or
prefabricated metal, with a well anchored footer,
or other accepted rigid, non-erodible material
-location: 3-6 inches above downstream natural
grade to avoid turf buildup
-3ft. of VDOT #3 stone, underlain by filter fabric just
below spreader
-vegetated receiving area must be stabilized
, Construction sequence for - no clearing, grading, heavy equipment
conserved open space -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
Maintenance of Vegetated Filter minimal; spring cleanup, regular mowing, check
Strips 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
Questions and Correct Answers | Newest Update
2026/2027 | Graded A+ | 100% Assured Pass.
Save
Terms in this set (145)
What are the types of disconnection 1) simple disconnection - rooftops and/or on-lot
allowed for rooftop disconnection? residential impervious surfaces are directed to
pervious areas
2) disconnection leading to an alternative runoff
reduction practice adjacent to the roof (ex: soil
compost amended filter path)
Why have a rooftop disconnection to -lot size too small
an alternative practice? -filter width is too narrow
-need more water quality credit
Functions provided by simple -annual runoff volume reduction
rooftop disconnection -total phosphorus mass load removal
-total nitrogen mass load removal
Alternative rooftop disconnection -soil compost-amended filter path
types -dry-well or french drain
-rain-garden//front yard bioretention
-rainwater harvesting//cistern
-stormwater planter
,How does sheet flow to a vegetated Filter strips are vegetated areas that treat sheet
filter strip or conserved open space flow delivered from adjacent impervious and
work? managed turd areas by slowing runoff velocities
and allowing sediment and attached pollutants to
settle and/or be filtered by the vegetation
Gravel diaphragm -pretreatment device
-maintains sheet flow
-not necessary if contributing drainage area is
solely turf
-trench is 2 ft. wide and 1 ft. deep
-runs on same contour at top of filter strip
-drop at least 3 inches
-fabric between gravel and soil
Engineered level spreader -forebay: max. 3ft. deep, transition to 1 ft. at level
spreader lip
-level spreader lip - concrete, wood, or
prefabricated metal, with a well anchored footer,
or other accepted rigid, non-erodible material
-location: 3-6 inches above downstream natural
grade to avoid turf buildup
-3ft. of VDOT #3 stone, underlain by filter fabric just
below spreader
-vegetated receiving area must be stabilized
, Construction sequence for - no clearing, grading, heavy equipment
conserved open space -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
Maintenance of Vegetated Filter minimal; spring cleanup, regular mowing, check
Strips 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
