BMPs Flashcards
What does BMP stand for?
Best Management Practices
What do BMP do?
Make approaches based on known science to allow client meet the required standards
Guidelines
Result Based
Developed in a regional context
Relies on accountability of qualified professional
What is the objective of BMP?
Maintain a Natural capital and environmental values during the development of urban and rural areas
Some examples of BMP topics
1Community planning, 2consultation, 3climate change, 4heritage & archeology, 5Noise, Ecosystem, 6Air Quality, 7Erosion and 8Sediment Control, 9Pollution Prevention
Explain the purpose of Community Planning
Main goal = > build a healthy environment
influences better emission, noise, light, distances of travel, convenience of life style, convenience of buying healthy food, safety.
The amount environmental resources needed to supply goods and services that is produced by civilization is ECOLOGICAL FOOTPRINT.
Explain what the Consultation part of BMP do
There is a consultation requirement that is needed to address these BMP.
Usually by giving out public notice (newspaper, internet, open letters), provide access to information, conducting general public consultation
How is climate change incorporated into these projects?
Design an idea that miminize the emission of GHG.
- promote public transit
- promote energy efficiency
Basically design an idea that creates less carbon footprints
What are some design criteria/scenearios to consider and reduce climate change?
High sea levels greater storm surges change in precipitation increase in peak flow events exxtreme events wind loading wildfires change an annual temps
All of climate change considerations
define Heritage and Archeology
Heritage - land that includes land covered by water which has a heritage value (historical worth) to BC or aboriginals.
Archeology - sites consist of physical remains from the past human activities.
ex: 8000 year old campsite in fraser river canyon
18th century fur trade fort on peace river
Both of these are protected under the law of BC Heritage Conservation Act
What is the BC Heritage Conservation Act?
Protect heritage and archeological sites regardless of whether they are on public/private land.
It is automatically protected if it has some physical evidence of human use predating to 1846.
What is the BMP for archeology?
greenfield developments will require archeological assessment prior to the project.
assessment is called AOA - archaeological overview assessments
- Initial review of KNOWN information in the area to determine the likelihood of an archeological site.
- can impact design, schedule and cost of the greenfield development
How does Noise impact us?
All municipalities have a noise control bylaws that limits the hours for construction work.
How do you control noise?
remove the source
remove the receptor of the noise
protect the receptor
control and reduction measures for the noise
Examples of noise reduction measures
equipment positions
turn off the equipment when it’s not in use.
noise blanket over loud generators
noise barriers for highways
Quiet pavements
How to perform BMP for air quality?
Things to consider during operation:
- system design and selection
- minimize traffic congestion
- material used
- setbacks from busy roads
- location of the vents / discharges
During Construction, you can do:
- equipment maintenance, equipment selection
- minimize idling
- dust control by water, fence, vegetation
- secure loads on trucks
- minimize drop heights or use drop chutes to discard things.
BMP for Ecosystem, species and habitat
species and habitat are very economical valuable resources to us. Any sites that enhances the biodiversity of the area will be bring attention. It could range from small land area to huge landscape.
Derive the list by red and blue.
Red = extirpated, endangered, threatened ( need to stay away from those ) Blue = not immediately threatened, but their population is decreasing and it is a concern
How to appraoch BMP for Ecosystem, species and habitat?
Gather information on the area.
Locate the development in a less sensitive area that doesn’t affect the ecosystem.
Avoid building on floodplains
Provide buffer zones around valued areas
Provide wildlife corridors
Construction schedule need to be considered when to start.
What is erosion and sediment control?
erosion - removal of soil particles by action of water, wind, ice or gravity
sediment - natural occuring materials that is transported by water, wind, ice, or gravity
Types of erosions
Raindrop erosion
Sheet erosion
Rill and Gully erosion
Stream and Channel Erosion
What causes erosions
Land developement increases the likelihood of erosions. It damages the site, requires clean up, sediment reduces water quality which imapcts species living in there and drinking from the streams.
sediment clogs
How do you do erosion BMP?
Source control to reduce erosion and sediment control as well.
By erosion control, it depends on the soil type, vegetative cover, slope steepness, slope length and preciptiation intensity and duration.
What are the major principles to implement BMP for erosions?
plan the development to fit the site
- should be large graded area that is on natural level areas.
- preserve as much natural vegetation as possible.
- Areas of steep or long slopes of possible erosion soil requires engineering to be redeveloped into a safety manner.
- —–> leave a buffer strip of natural vegetation at the bottom of the slope.
- stabilize and protect disturbed area as soon as possible.
- Keep runoff velocities slow
- ———> mulching, matting, seeding, live staking, ripraps.
- protect the disturbed areas from runoff
- retain sediment within the corridor or site area
- implement a thorough maintenance and follow up program -> critical and daily checks are typical
Absorbent Landscaping
soaks up stores slowly releases rainfall
No underlying subdrain or resovior
does not pond water - needs to overflow to somewhere else.
inflitration swale
shallow grassed , planted channels
stores design storm, allowing to infiltrate slowly
Storage may be on the surface or underground rock reservoir
flows greater than design storm are conveyed to other systems
10-20% upstream impervisor area
Full infliritation speed
> 30mm/hr
suitable to catch small catchments and high subsoil infiltrate
full infiltration with reservoir
reduces ponding WITH underground storage!
>15mm/hr
Partial infiltration and Subdrain
subdrain provides underground overflow before it backs up to the swale
reservior increases storage capacity
<15mm/hr low subsoil infiltration
great for large catchment and low subsoil infiltration
What are some problematic infiltration systems
high water tables Bed rocks drinking water well land use construction consideration
