Environmental Site Design and BMPs (Basics) Flashcards
What is the belief that Environmental Site Design is grounded in?
Environmental balance can be maintained as new communities are developed throughout our watersheds if basic principles are obeyed.
(Module 6 / Page 2)
Describe the contrast between the old view of stormwater and Environmental Site Design’s view of stormwater.
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)
In the field of stormwater management, what does (Tv) stand for?
treatment volume
Module 6 / Page 5
In the field of stormwater management, what does (LID) stand for?
Low Impact Development
Module 6 / Page 8
What would (TP) stand for with regards to BMP Pollutant Removal Effeciencies?
total phosphorus
Module 6 / Page 9
In the field of stormwater management, what does (EMC) stand for?
Event Mean Concentration
Module 6 / Page 9
In the field of stormwater management, what does (MTD) stand for?
Manufactured Treatment Devices
Module 6 / Page 8
In the field of stormwater management, what does (HSG) stand for?
Hydrologic Soil Group
Module 6 / Page 9
In the field of stormwater management, what does (CN) stand for?
Curve Number
Module 6 / Page 15
What is a filter strip (Design Standard 2)?
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)
What is soil restoration or soil compost amendments (Design Standard 4)?
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)
What are vegetated roofs (Design Standard 5)?
alternative roof surfaces that typically consist of waterproofing and drainage materials and an engineered growing media that is designed to support plant growth.
What are the two types of vegetative roofs? What are the differences?
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)
What is permeable pavement (Design standard 7)?
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)
What 4 layers would you expect to see in a permeable pavement?
- Surface pavement layer
- Underlying Stone Aggregate
- Reservoir Layer
- Filter Fabric
(Module 6 / Page 17)