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Virginia SWM (Basic) > Environmental Site Design and BMPs (Basics) > Flashcards

Environmental Site Design and BMPs (Basics) Flashcards

1
Q

What is the belief that Environmental Site Design is grounded in?

A

Environmental balance can be maintained as new communities are developed throughout our watersheds if basic principles are obeyed.

(Module 6 / Page 2)

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2
Q

Describe the contrast between the old view of stormwater and Environmental Site Design’s view of stormwater.

A

The old view of stormwater was as a waste product in need of disposal, but ESD views stormwater as a precious resource that must be used carefully

(Module 6 / Page 2)

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3
Q

In the field of stormwater management, what does (Tv) stand for?

A

treatment volume

Module 6 / Page 5

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4
Q

In the field of stormwater management, what does (LID) stand for?

A

Low Impact Development

Module 6 / Page 8

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5
Q

What would (TP) stand for with regards to BMP Pollutant Removal Effeciencies?

A

total phosphorus

Module 6 / Page 9

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6
Q

In the field of stormwater management, what does (EMC) stand for?

A

Event Mean Concentration

Module 6 / Page 9

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7
Q

In the field of stormwater management, what does (MTD) stand for?

A

Manufactured Treatment Devices

Module 6 / Page 8

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8
Q

In the field of stormwater management, what does (HSG) stand for?

A

Hydrologic Soil Group

Module 6 / Page 9

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9
Q

In the field of stormwater management, what does (CN) stand for?

A

Curve Number

Module 6 / Page 15

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10
Q

What is a filter strip (Design Standard 2)?

A

Vegetated Areas that treat sheet flow delivered from adjacent impervious and managed turf areas by slowing runoff velocities and allowing sediment and attached pollutants to settle and /or be filtered by the vegetation.

(Module 6 / Page 12)

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11
Q

What is soil restoration or soil compost amendments (Design Standard 4)?

A

a Environmental Site Design Practice applied after construction to deeply till compacted soils and restore their porosity by amending them with compost.

(Module 6 / Page 14)

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12
Q

What are vegetated roofs (Design Standard 5)?

A

alternative roof surfaces that typically consist of waterproofing and drainage materials and an engineered growing media that is designed to support plant growth.

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13
Q

What are the two types of vegetative roofs? What are the differences?

A

Intensive and Extensive

  • Intensive vegetated roofs have a deeper growing media layer that ranges from 6” to 4’ thick, which is planted with a wider variety of plants, including trees.
  • Extensive vegetated roofs have a shallower growing media (2-6”), which is planted with carefully selected drought tolerant vegetation.

(Module 6 / Page 15)

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14
Q

What is permeable pavement (Design standard 7)?

A

an alternative paving surface that allows stormwater runoff to filter through voids in the pavement surface into an underlying stone reservoir, where it is temporarily stored and/or infiltrated.

(Module 6 / Page 17)

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15
Q

What 4 layers would you expect to see in a permeable pavement?

A
  • Surface pavement layer
  • Underlying Stone Aggregate
  • Reservoir Layer
  • Filter Fabric

(Module 6 / Page 17)

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16
Q

Which stormwater design specification has the greatest runoff reduction capability?

A

Infiltration practices

Module 6 / Page 18

17
Q

What type of sites should avoid using Infiltration Practices?

A

Any site designated as a stormwater hotspot

Module 6 / Page 18

18
Q

In the field of stormwater management, what does (CPv) stand for?

A

channel protection volume

Module 6 / Page 21

19
Q

Describe the function of stormwater filters (Design Specification 12).

A

Stormwater filters capture, temporarily store, and treat stormwater runoff by passing it through an engineered filter media, collecting the filtered water in an underdrain and then returning it back to the storm drainage system.

(Module 6 / Page 22)

20
Q

What type of site would a stormwater filter be ideal for?

A

A small, highly impervious site

Module 6 / Page 22

21
Q

What is a wet pond? (Design Specification 14)

A

a permanent pool of standing water that promotes a better environment for gravitational settling, biological uptake, and microbial activity.

(Module 6 / Page 24)

22
Q

In the field of stormwater management, what does (ED) stand for?

A

Extended Detention

Module 6 / Page 25

23
Q

In general, what five categories are the BMPs compared in relation to each other?

A
  • Annual runoff volume reduction (RR)
  • Phosphorus/Nitrogen mass load removal
  • Phosphorus/Nitrogen EMC reduction by BMP treatment process
  • Channel protection
  • Flood mitigation

(Module 6 / Page 25)

24
Q

In the field of stormwater management, what does (RR) stand for?

A

Runoff Reduction

Module 6 / Page 14

25
Q

What 3 design specifications are commonly used with soil compost amendments?

A
  • Simple rooftop disconnection
  • Filter Strips
  • Grass Channel

(Module 6 / Page 14)

26
Q

What type of soils are soil compost amendments generally not applicable for? What type of soils can benefit by using soil compost amendments?

A

Hydrologic Soil Groups A and B

Soil Compost Amendments can benefit Hydrologic Soil Groups C and D

(Module 6 / Page 14)

27
Q

What 5 alternative practices are commonly used with rooftop disconnections?

A
  • Soil compost amended filter path
  • Dry well or French drain “Micro-infiltration”
  • Rain garden “Micro- bio-retention”
  • Rainwater harvesting
  • Storm-water Planter “Urban bio-retention”

(Module 6 / Page 11)

28
Q

What is the “primary component” of a bio-retention practice?

A

The filter bed

Module 6 / Page 19

29
Q

What is a bio-retention filter bed made of?

A

Typically a mixture of sand, soil, and organic material with a surface mulch layer

(Module 6 / Page 19)

30
Q

What is a dry swale?

A

A bio-retention cell that is shallower, configured as a linear channel, and covered with turf or other surface material.

(Module 6 / Page 20)

31
Q

What does an under-drain system typically consist of?

A

A perforated pipe and within a gravel layer.

Module 6 / Page 20

32
Q

Wet swales, constructed wetlands, and wet ponds are an ideal environment for what three things?

A
  • Gravitational settling
  • Biological Uptake
  • Microbial Activity

(Module 6 / Page 21)

33
Q

What is the only situation that an Extended detention pond or a constructed wetland should be considered?

A

If there is remaining treatment volume or channel protection volume to manage after all other upland runoff reduction practices have been considered and properly credited.

(Module 6 / Page 25)

34
Q

What two benefits can temporary ponding bring about?

A
  • Enables particulate pollutants to settle out
  • Reduces the maximum peak discharge to the downstream channel

(Module 6 / Page 25)

35
Q

Extended detention ponds are normally combined with what other 2 practices?

A

Either wet ponds or constructed wetlands

Module 6 / Page 25

Virginia SWM (Basic) (5 decks)

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