Module 6
Which of the following characteristics visually differentiate a bioretention facility from a decorative planting bed? (Select 2)
a. Bioretention facilities have tall, weedy looking plants that are typically native, while decorative planting beds typically use vegetation with bright colors and flowers.
b. Bioretention facilities include a depressed area, where water from adjacent land areas can collect, whereas decorative planting beds are typically raised slightly or mounded.
c. If surrounded by a curb or ledge, bioretention facilities must have a curb cut or inlet to allow stormwater to enter the facility. Decorative planters surrounded by a curb do not require either.
d. Bioretention facilities normally have standing water, since they act as retention facilities. Decorative planters will not have standing water, and are designed to drain to other drainage structures.
b. Bioretention facilities include a depressed area, where water from adjacent land areas can collect, whereas decorative planting beds are typically raised slightly or mounded.
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c. If surrounded by a curb or ledge, bioretention facilities must have a curb cut or inlet to allow stormwater to enter the facility. Decorative planters surrounded by a curb do not require either.
A client plans to install a parking lot and wants to manage stormwater runoff using green infrastructure. Per the local codes, they need to use black paving to be visually consistent with other developments. Which of the following is the best option?
a. Install a full traditional asphalt parking lot support the weight of the vehicles, install bioretention in parking lot islands.
b. Ensure the land adjacent to the parking lot is fully stabilized, install porous asphalt within the parking spaces, and install bioretention in parking lot islands and adjacent spaces.
c. Install a traditional asphalt parking lot to support the weight of the vehicles, with small inlets which lead to an underground vault that slowly releases stormwater to the storm sewer. Plant trees adjacent to the parking lot.
d. Install a parking lot using crusher run gravel, install raised planting islands to install trees to intercept stormwater prior to becoming stormwater runoff.
b. Ensure the land adjacent to the parking lot is fully stabilized, install porous asphalt within the parking spaces, and install bioretention in parking lot islands and adjacent spaces.
Which of the following correctly describes benefits associated with typical rainwater harvesting practices as compared to other forms of green infrastructure?
a. Rainwater harvesting controls stormwater while offering the option of re-using the water for non-potable uses, unlike practices such as bioretention and permeable pavement
b. Rainwater harvesting captures and treats stormwater, unlike bioretention
c. Rainwater harvesting can be implemented in places with snow, unlike permeable pavement
d. Rainwater harvesting can easily be implemented in spatially constrained sites, unlike permeable pavement
a. Rainwater harvesting controls stormwater while offering the option of re-using the water for non-potable uses, unlike practices such as bioretention and permeable pavement
Which statements best describe the benefits associated with green roofs? (Select 2)
a. Collect and store water for later use as non-potable water, such as toilets and laundry.
b. Provide retention and detention of stormwater, and water quality treatment
c. Provide a reflective surface which re-directs sunlight to reduce the urban heat island
d. Keep rooftops cool in hot climate, and conserve energy within buildings by moderating temperature
b. Provide retention and detention of stormwater, and water quality treatment
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d. Keep rooftops cool in hot climate, and conserve energy within buildings by moderating temperature
Select the green infrastructure practices that are most accurate. (Select 2)
a. An infiltration trench is installed within long linear parking lot islands to manage runoff, and avoid conflict with deep utilities.
b. A dry well is installed along a long, serpentine walking path to manage stormwater while providing aesthetic value
c. A bioretention facility with an open bottom relying on infiltration is installed immediately adjacent to a home to capture gutter flow which has been causing basement flooding.
d. A dry well is installed to manage stormwater from an adjacent building. Due to its depth, stormwater is routed through a pre-treatment structure before it reaches the dry well.
a. An infiltration trench is installed within long linear parking lot islands to manage runoff, and avoid conflict with deep utilities.
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d. A dry well is installed to manage stormwater from an adjacent building. Due to its depth, stormwater is routed through a pre-treatment structure before it reaches the dry well.
Which statements best describe the typical flow sequence within bioretention facilities?
(Select 2)
a. Stormwater enters the bioretention facility, then some will infiltrate into the bioretention soil media then into the gravel storage layer, where it will either infiltrate or discharge to the sewer through the underdrain.
b. After entering the facility, stormwater next fills up the ponding elevation and enters the overflow riser which slowly discharges to the sewer system through the underdrain
c. Once in the ponding area, water is slowly diverted to a storage area to be pumped into buildings and used to flush toilets.
d. Once in the ponding area, some water will evaporate and some will infiltrate into the bioretention soil media where it can be absorbed by plants and transpired.
a. Stormwater enters the bioretention facility, then some will infiltrate into the bioretention soil media then into the gravel storage layer, where it will either infiltrate or discharge to the sewer through the underdrain.
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d. Once in the ponding area, some water will evaporate and some will infiltrate into the bioretention soil media where it can be absorbed by plants and transpired.
Which of the following describes a scenario where pervious concrete or porous asphalt would be generally acceptable? (Select 2)
a. A parking lot used for parking of light ATV's (four wheelers, dirt bikes, etc.) that will be used in an off- road recreation facility.
b. The travel lane on a low-traffic roadway, in a climate where snow is uncommon.
c. Parking spaces at a grocery store, where personal use vehicles) including cars, SUV's, and non- commercial trucks) may park.
d. Parking spaces next to natural sand dunes at a beach at the state park.
b. The travel lane on a low-traffic roadway, in a climate where snow is uncommon.
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c. Parking spaces at a grocery store, where personal use vehicles) including cars, SUV's, and non- commercial trucks) may park.
Which of the following strategies can reduce the concentration of pollutants in stormwater runoff from roofs? (select 2)
a. Replacing a painted enamel roof with an asphalt roof
b. Harvesting rainwater and releasing it to a bioretention facility or garden during dry weather
c. Replacing an asphalt roof with a slate roof
d. Harvesting rainwater with a rain barrel and releasing it to the storm sewer slowly after a storm
b. Harvesting rainwater and releasing it to a bioretention facility or garden during dry weather
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c. Replacing an asphalt roof with a slate roof
Which of the following actions are included in the construction sequence for both green roofs and blue roofs? (Select 2)
a. Source, stage, and protect all materials
b. Protect roof membrane from any potential damage during construction
c. Replace asphalt rooftops with a natural material such as slate prior to installation.
d. Assess delivered plants for signs of distress. If browning is observed, apply a nutrient solution.
a. Source, stage, and protect all materials
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b. Protect roof membrane from any potential damage during construction
Select the options that best describe proper installation protocols for dry wells: (Select 2)
a. Avoid soil compaction in and around the proposed dry well location
b. Direct runoff from areas with high levels of pesticide/fertilizer use and high nutrient inputs (golf courses, sport fields, cemeteries, commercial composting, animal handling, nurseries) for maximum water quality protection
c. Ensure plants are delivered to the site as close to their scheduled installation as possible
d. Protect the surface inlet and clean and washed stone from stockpiles of landscaping materials and other construction debris
a. Avoid soil compaction in and around the proposed dry well location
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d. Protect the surface inlet and clean and washed stone from stockpiles of landscaping materials and other construction debris
How many cubic feet of soil are recommended for a tree with a 10-square foot tree crown?
a. 10-30 square feet
b. 10-30 cubic feet
c. 50-100 cubic feet
d. 50-100 square feet
b. 10-30 cubic feet
Which of the following indicates the proper order of installation for the various components of porous asphalt on stable soils.
a. Stabilize drainage area, excavate to depths as indicated on plans, scarify native soils, install aggregate base layer in lifts, compacting each lift with a vibratory roller. Install choker course. Install porous asphalt.
b. Stabilize drainage area, excavate to depths as indicated on plans, scarify native soils, install choker layer and compact with vibratory roller. Install aggregate base layer in lifts, compacting each lift with a vibratory roller. Install porous asphalt.
c. Stabilize drainage area, excavate to depths as indicated on plans, compact sub-base with a vibratory roller. Install choker layer and compact with vibratory roller. Install aggregate base layer in lifts, compacting each lift with a vibratory roller. Install porous asphalt.
d. Stabilize drainage area, excavate to depths as indicated on plans, compact subgrade with a vibratory roller. Install choker layer and compact with vibratory roller. Install aggregate base layer in lifts, compacting each lift with a vibratory roller. Install sand layer, wet thoroughly and allow to dry and settle for 24 hours. Install porous asphalt.
a. Stabilize drainage area, excavate to depths as indicated on plans, scarify native soils, install aggregate base layer in lifts, compacting each lift with a vibratory roller. Install choker course. Install porous asphalt.
Review the following and select the option that describes the best maintenance solution to the problem described: (Select 2)
a. A rain barrel is leaking where the conveyance pipe from the roof enters the rain barrel. Personnel should check that no pipe joints are disconnected, and that the pretreatment filter is not clogged.
b. An inspector notices that there is algae growing inside of a rain barrel. They inspect and replace the vermin screen.
c. During a large storm, water is gushing out of a pipe connected to a cistern that is neither the intake or the distribution system. An inspector caps the pipe to avoid bypass.
d. Despite several rain storms, water is not collecting in a rain barrel. The barrel is not leaking. The crew member decides to inspect the gutter screen pretreatment and removes an obstruction.
a. A rain barrel is leaking where the conveyance pipe from the roof enters the rain barrel. Personnel should check that no pipe joints are disconnected, and that the pretreatment filter is not clogged.
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d. Despite several rain storms, water is not collecting in a rain barrel. The barrel is not leaking. The crew member decides to inspect the gutter screen pretreatment and removes an obstruction.
Select the options which best compare the functional value of green and blue roofs for stormwater management. (Select 2)
a. Blue roofs provide water quality treatment and provide opportunities to grow vegetables
b. Blue roofs reduce pollutant load to surface waters by reducing overflows in combined sewer systems, and in separate sewers only if additional filters are provided.
c. Green roofs reduce pollutant load to surface waters by reducing overflows in combined sewer systems and in separate sewers by providing enhanced water quality treatment due to filtering of stormwater through media and uptake of pollutants by plants.
d. Blue roofs provide water and air quality treatment along with habitat for pollinators.
b. Blue roofs reduce pollutant load to surface waters by reducing overflows in combined sewer systems, and in separate sewers only if additional filters are provided.
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c. Green roofs reduce pollutant load to surface waters by reducing overflows in combined sewer systems and in separate sewers by providing enhanced water quality treatment due to filtering of stormwater through media and uptake of pollutants by plants.
Which of the following statements best describe the sequence of construction for dry well installation? Assume the site has been staked out, and sediment controls have been installed. (Select 2)
a. Upon arrival to site, ensure materials are properly stored. Excavate to the design depth, avoiding compaction to protect the infiltration capacity of the subgrade.
b. After excavation, install geotextile per plans, then install rock storage area in 12 inch maximum lifts, compacting each with a plate compactor.
c. After excavation, install geotextile per plans, and place stone in rock storage area in 6 inch maximum lifts, compacting each with a vibratory roller.
d. Upon arrival to site, ensure materials are properly stored and excavate to the design depth. Compact the subsoils by with a plate compactor to ensure structural stability of the subgrade.
a. Upon arrival to site, ensure materials are properly stored. Excavate to the design depth, avoiding compaction to protect the infiltration capacity of the subgrade.
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b. After excavation, install geotextile per plans, then install rock storage area in 12 inch maximum lifts, compacting each with a plate compactor.
Which of the following represents appropriate uses for geotextile fabric? (Select 2)
a. To separate bioretention media from a horizontal or diagonal interface with existing soil
b. To separate bioretention media from the gravel storage layer
c. Below check dams or inlet stones
d. On the sides of bioretention when adjacent infrastructure is present that requires protection
c. Below check dams or inlet stones
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d. On the sides of bioretention when adjacent infrastructure is present that requires protection
The Department of Transportation is interested in repaving a road and managing the stormwater using green infrastructure. The project is located in a high traffic area that doesn't use sand on roads in winter, and the speed limit is 55 mph. Which of the following options is most appropriate?
a. A plastic grid system, rated for heavy vehicular loads, filled with gravel
b. Porous asphalt
c. Pervious concrete
d. Traditional pavement, with adjacent bioretention systems
d. Traditional pavement, with adjacent bioretention systems
Which of the following represent basic maintenance tasks associated with cisterns and rain barrels? (Select 2)
a. Inspecting adjacent landscaping, stabilizing soils, and removing overgrowth of adjacent grasses
b. Checking all pipe connections and pre-treatment filters
c. Inspecting the wearing course
d. Draining and cleaning tank walls with chlorine solution per manufacturer or engineer specifications.
b. Checking all pipe connections and pre-treatment filters
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d. Draining and cleaning tank walls with chlorine solution per manufacturer or engineer specifications.
A client is interested in managing stormwater using green infrastructure, while also providing a gathering space that includes a fruit tree grove. Which of the following best describe their available options? (Select 2)
a. A rain barrel or cistern which distributes flow to irrigate an adjacent garden area
b. An extensive green roof and a cistern that collects water for distribution to a roof irrigation system
c. An intensive green roof and a cistern that collects water for distribution to a roof irrigation system
d. A light colored traditional concrete parking lot with an underground storage vault and raised bed planter boxes within the parking lot islands
a. A rain barrel or cistern which distributes flow to irrigate an adjacent garden area
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c. An intensive green roof and a cistern that collects water for distribution to a roof irrigation system
When performing maintenance on a facility, which of the following describe a potential problem and an appropriate solution? (Select 2)
a. Ponded water is observed at the surface of the drywell for extended periods of time. Inspect the inlet sump (if present), pipe cleanouts, and surface of the facility for clogging and remove any obstructions
b. The splash pad previously installed at the base of the gutter downspout to disperse flow and slow the velocity of runoff is missing. Replace splash pad.
c. The access lid to the sump and cleanouts are visible. Cover with top soils and seed, then stabilize.
d. The sump is observed to be approximately % of the way full with sediment, double what is considered acceptable. Clean immediately and report to a supervisor.
a. Ponded water is observed at the surface of the drywell for extended periods of time. Inspect the inlet sump (if present), pipe cleanouts, and surface of the facility for clogging and remove any obstructions
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b. The splash pad previously installed at the base of the gutter downspout to disperse flow and slow the velocity of runoff is missing. Replace splash pad.
Which of the following activities are most appropriate for a post construction visit?
(Select 2)
a. Verify that the contributing drainage area is stabilized
b. Verify ponding depths and the elevations for inlets, outlets, and overflows, and bottom area of facility
c. Verify that tree protection fence has been installed and is in good condition
d. Ensure that the subgrade is not compacted
a. Verify that the contributing drainage area is stabilized
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b. Verify ponding depths and the elevations for inlets, outlets, and overflows, and bottom area of facility
The electric utility company has been undergoing a large effort to place overhead lines underground. When negotiating the agreement for utility patching within permeable pavement systems, which best practices should you insist on? (Select 2)
a. Install a construction area using a sand sub*base and crusher run on the permeable surface so that equipment will not unravel the surface, and store excavated soils to the side of the parking lot
b. Replace the permeable surface with traditional pavement as long as the total area is less than 15% of the permeable surface
c. Replace the permeable surface with traditional pavement equivalent as long as the total area is less than 10% of the permeable surface
d. Install a clean entrance and wheel wash with sediment controls for vehicles accessing the permeable surface, and cover the permeable surface while excavating
c. Replace the permeable surface with traditional pavement equivalent as long as the total area is less than 10% of the permeable surface
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d. Install a clean entrance and wheel wash with sediment controls for vehicles accessing the permeable surface, and cover the permeable surface while excavating
Which of the following could be a potential barrier to installation of a rainwater harvesting system? (Select 2)
a. Local regulations in arid regions which prevent the harvesting and use of rainwater on private property
b. Stormwater management regulations which require the use of green infrastructure to manage stormwater
c. Local health code that prevents the re-use of harvested rainwater
d. A site with limited space where 100% of the at-grade space is required for parking, the building, or gathering space
a. Local regulations in arid regions which prevent the harvesting and use of rainwater on private property
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c. Local health code that prevents the re-use of harvested rainwater
Which of the following describes a typical maintenance problem and solution for a blue roof? (Select 2)
a. Poor plant establishment, which can be fixed through proper species selection
b. Wind has displaced gravel media and resulted in trash accumulation. Remove debris and replace gravel media
c. Leak detection system indicates a problem. Engage a roof contractor to remedy the issue
d. Poor drainage is noted. Vacuum to restore infiltration capacity of surface course.
b. Wind has displaced gravel media and resulted in trash accumulation. Remove debris and replace gravel media
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c. Leak detection system indicates a problem. Engage a roof contractor to remedy the issue
Select the statement that best describes how stormwater is typically conveyed from a rooftop when managed using a dry well. (Select 2)
a. Stormwater passes from the roof to the gutter and downspout, then to a splash pad where it flows over land to the dry well and infiltrates into the rock well and into the subgrade and surrounding soils
b. Stormwater passes from the roof to the gutter and downspout, is conveyed using a solid pipe extending underground from the downspout into the rock well, then pumped into a bioretention facility for additional water quality treatment.
c. Stormwater passes from the roof to the gutter and downspout, is conveyed using a perforated pipe extending underground from the downspout into the rock well, then pumped into a bioretention facility for additional water quality treatment.
d. Stormwater passes from roof to the gutter and downspout, then to a bioretention or sump inlet for pretreatment, where it discharges into the dry well and ultimately infiltrates into the subgrade and surrounding soils
a. Stormwater passes from the roof to the gutter and downspout, then to a splash pad where it flows over land to the dry well and infiltrates into the rock well and into the subgrade and surrounding soils
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d. Stormwater passes from roof to the gutter and downspout, then to a bioretention or sump inlet for pretreatment, where it discharges into the dry well and ultimately infiltrates into the subgrade and surrounding soils