4/6/26, 4:30 PM Storm water Management Inspector Exam Questions and Correct Answers | Newest Update 2026/2027 | Graded A+ | 100% Assured…
Storm water Management Inspector Exam Questions and
Correct Answers | Newest Update 2026/2027 | Graded A+ |
100% Assured Pass.
What are the types of disconnection allowed for rooftop disconnection?
1) simple disconnection - rooftops and/or on-lot 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 an alternative practice?
-lot size too small
-filter width is too narrow
-need more water quality credit
Functions provided by simple rooftop disconnection
-annual runoff volume reduction
-total phosphorus mass load removal
-total nitrogen mass load removal
… 1/37
,4/6/26, 4:30 PM Storm water Management Inspector Exam Questions and Correct Answers | Newest Update 2026/2027 | Graded A+ | 100% Assured…
Alternative rooftop disconnection types
-soil compost-amended filter path
-dry-well or french drain
-rain-garden//front yard bioretention
-rainwater harvesting//cistern
-stormwater planter
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
sediment and attached pollutants to settle and/or be filtered by the vegetation
… 2/37
,4/6/26, 4:30 PM Storm water Management Inspector Exam Questions and Correct Answers | Newest Update 2026/2027 | Graded A+ | 100% Assured…
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
… 3/37
, 4/6/26, 4:30 PM Storm water Management Inspector Exam Questions and Correct Answers | Newest Update 2026/2027 | Graded A+ | 100% Assured…
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
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
… 4/37
Storm water Management Inspector Exam Questions and
Correct Answers | Newest Update 2026/2027 | Graded A+ |
100% Assured Pass.
What are the types of disconnection allowed for rooftop disconnection?
1) simple disconnection - rooftops and/or on-lot 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 an alternative practice?
-lot size too small
-filter width is too narrow
-need more water quality credit
Functions provided by simple rooftop disconnection
-annual runoff volume reduction
-total phosphorus mass load removal
-total nitrogen mass load removal
… 1/37
,4/6/26, 4:30 PM Storm water Management Inspector Exam Questions and Correct Answers | Newest Update 2026/2027 | Graded A+ | 100% Assured…
Alternative rooftop disconnection types
-soil compost-amended filter path
-dry-well or french drain
-rain-garden//front yard bioretention
-rainwater harvesting//cistern
-stormwater planter
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
sediment and attached pollutants to settle and/or be filtered by the vegetation
… 2/37
,4/6/26, 4:30 PM Storm water Management Inspector Exam Questions and Correct Answers | Newest Update 2026/2027 | Graded A+ | 100% Assured…
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
… 3/37
, 4/6/26, 4:30 PM Storm water Management Inspector Exam Questions and Correct Answers | Newest Update 2026/2027 | Graded A+ | 100% Assured…
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
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
… 4/37
