kari mackenbach, green initiatives practice leader, urs christine worley, urs flood and stormwater...
TRANSCRIPT
Kari Mackenbach, Green Initiatives Practice Leader,
URS
Christine Worley, URS
Kari Mackenbach, Green Initiatives Practice Leader,
URS
Christine Worley, URS
Flood and Stormwater Mitigation Using Green Infrastructure
Flood and Stormwater Mitigation Using Green Infrastructure
Incorporate Green InfrastructureIncorporate Green Infrastructure
•What is Green Infrastructure?
•How does it relate to stormwater and flood management?
•What are the site selection criteria?
•What are costs and operation and maintenance concerns?
• Natural and managed green areas in both urban Natural and managed green areas in both urban and rural settings,and rural settings,
• Strategic connection of open green areas,Strategic connection of open green areas,• Treating rainwater as a resource and not as Treating rainwater as a resource and not as
trash to be discarded as quickly as possible,trash to be discarded as quickly as possible,• Transforming “grey” infrastructure to green Transforming “grey” infrastructure to green
through restoration of watersheds to slow and through restoration of watersheds to slow and store water, andstore water, and
• Providing multiple benefits for people.Providing multiple benefits for people.
Green InfrastructureGreen Infrastructure
What Else Can Green Infrastructure Do?What Else Can Green Infrastructure Do?
• Help communities come closer to Help communities come closer to attaining their requirements attaining their requirements (CWA, MS4, (CWA, MS4, NPDES, CSO, Chesapeake Bay TMDL, etc.)NPDES, CSO, Chesapeake Bay TMDL, etc.)
• Enhance public perception Enhance public perception (sustainable (sustainable cities)cities)
• Leverage State and Federal program Leverage State and Federal program dollars dollars (brownfield redevelopment)(brownfield redevelopment)
• Opportunity to “marry” two forms of Opportunity to “marry” two forms of public work effort public work effort (street, sidewalks, (street, sidewalks, stormwater management)stormwater management)
Street
Stormdrain
House
Driveway
Even your home has a big impact on stormwater runoff
Street
Stormdrain
1,500 s.f. house (& patio) x 1” rain = 925 gallons of runoff
1,000 s.f. driveway x 1” rain = 617 gallons of runoff
2,500 s.f. “impervious” x 1” rain = 1,542 gallons of runoff
+ “Green Concrete” Compacted Lawn
8,390 s.f. “impervious” x 1” rain (if infiltrates first ¼” of rain)
= 3,880 gallons of runoff
In a 1” rainfall
Potential Runoff:
5,422 gallons
Where can rain soak in?
Q - How Do We Protect Our Streams?Q - How Do We Protect Our Streams?
AA - - Manage How Stormwater Runs Off the Landscape Manage How Stormwater Runs Off the Landscape
Photo: Rusty Schmidt
DistributedStormwater Features
RegionalTraditional Techniques
Distributing Stormwater Controls Close to Runoff Sources
Distributing Stormwater Controls Close to Runoff Sources
Green Roof ApplicationsGreen Roof Applications
Pervious InfrastructurePervious Infrastructure
Rain Gardens & Bio-Infiltration DevicesRain Gardens & Bio-Infiltration Devices
Green Infrastructure in Your Backyard!Green Infrastructure in Your Backyard!
Local ChallengesLocal Challenges
Local OpportunitiesLocal Opportunities
CONSTRUCTING GREEN SOLUTIONS ON EVERY STREET
CONSTRUCTING GREEN SOLUTIONS ON EVERY STREET
RESIDENTAL RETROFIT VISUAL RESIDENTAL RETROFIT VISUAL
RESIDENTIAL RETROFIT RESIDENTIAL RETROFIT RAINGARDENRAINGARDEN
RESIDENTIAL RETROFIT-RESIDENTIAL RETROFIT-PERVIOUS PAVERS PERVIOUS PAVERS
http://www.coxconcrete.com/products/rcp/index.html
Green infrastructure does not replace gray infrastructure.
Green infrastructure does not replace gray infrastructure.
$ $ $
Can reduce the capital costs and O & M costs of gray technology.
Can reduce the capital costs and O & M costs of gray technology.
The Green Behind the “Green” The Green Behind the “Green”
Green Infrastructure Green Infrastructure Type Type
Installation Installation Costs Costs
Operation and Operation and MaintenanceMaintenance
Life Cycle Life Cycle Costs Costs
Rain Gardens $5-7 sq. ft.
$12-15 sq. ft.
minimal Annual Mulching and Weeding $0.50-2 sq. ft
Pervious Pavement $20-35 sq. ft. minimal Fewer repairs, longer overall lifespan, yearly vacuuming/ pressure washing $0.15 sq. ft
Green Roof Applications $30 sq. ft.
$12-15 sq. ft.
great to minimal
Conventional roof 15-20 yrs, green is double or triple that life cycle, watering needed until
established.
Rain Barrels $35-75 great No maintenance, reduce water bills
Constructed Wetlands $6-20 sq. ft. minimal Replace pretreatment components 3-5 yrs, weed invasive plants
$200-500 yr
RIGHT-SIZING STRATEGY RIGHT-SIZING STRATEGY RIGHT-SIZING STRATEGY RIGHT-SIZING STRATEGY
Burnsville, MN
Paired Study of Residential Street Runoff Control
Burnsville, MN
Paired Study of Residential Street Runoff Control
Diagram courtesy of the City of Burnsville, MN from their Burnsville Stormwater Retrofit Study
17 Rain Gardens Installed Burnsville, MN
17 Rain Gardens Installed Burnsville, MN
Diagram courtesy of the City of Burnsville, MN from their Burnsville Stormwater Retrofit Study
5.3 acres treated and 7.5 acres controlled5.3 acres treated and 7.5 acres controlledAverage treated lot < .5 acresAverage treated lot < .5 acres
Average total rain gardens < 1 acreAverage total rain gardens < 1 acre
Burnsville, MNBurnsville, MN
AFTER
BEFORE
Photos Courtesy of Rice Creek Watershed District
Residential Residential NeighborhoodNeighborhood
Rain Garden RetrofitsRain Garden Retrofits
Long-Term MonitoringLong-Term Monitoring
Neighborhood Application Neighborhood Application
Burnsville, MNBurnsville, MN
Blue: Control
Red: With Rain Gardens
Diagram courtesy of the City of Burnsville, MN from their Burnsville
Stormwater Retrofit Study
•Create a “First of its Kind” Create a “First of its Kind”
•Municipal scale rain garden Municipal scale rain garden
•Educate the public Educate the public
•Design model for rain gardensDesign model for rain gardens •Balances security and opennessBalances security and openness
•Low impact/low maintenance Low impact/low maintenance
•Use innovative design measures Use innovative design measures
Site Specific/Neighborhood ApplicationSite Specific/Neighborhood Application
FEMA Supported, FEMA Funded.
Regional ApplicationsLarge Cities Initiatives Regional Applications
Large Cities Initiatives
Opportunities, Incentives & Regulatory Opportunities, Incentives & Regulatory
• Educating the public about Educating the public about water quality, sewer and water quality, sewer and stormwater concernsstormwater concerns
• Promoting green solutionsPromoting green solutions
• Encouraging funding for Encouraging funding for required sewer and required sewer and stormwater improvementsstormwater improvements
Kansas City, MO Kansas City, MO
Montgomery County, MD RainScapes Program
Montgomery County, MD RainScapes Program
•Provides rebate rewards to property owners for LID practices
http://www.montgomerycountymd.gov
LOUISVILLE, KY. OVERVIEW
LOUISVILLE, KY. OVERVIEW
• Flood Protection• Wastewater
Treatment• Stormwater
Management
EVALUATION OF GREEN VS. GRAY EVALUATION OF GREEN VS. GRAY
Develop Case Study Template Cost per Gallon Gallons Removed Long-term Trends Standardize Design Criteria and O&M Standardize Green Modeling Parameters Target Pilot CSO Basins for Right-Sizing
CLEAN, GREEN, GROWING COMMUNITY
GREEN TOOLS GREEN TOOLS GREEN TOOLS GREEN TOOLS
COLLABORATION ON GREEN COLLABORATION ON GREEN COLLABORATION ON GREEN COLLABORATION ON GREEN
FIRST CRADA COMMUNITYFIRST CRADA COMMUNITYFIRST CRADA COMMUNITYFIRST CRADA COMMUNITY
• 3 Year Effort-potential for up to 10 years• EPA’s involvement in Green Infrastructure
validation process• Establish gallons removed compared to
gray • Evaluate and establish long term trends• Standardize Design Criteria/O&M • Standardize Modeling Parameters• Other Ancillary Benefits• Partner with University of Louisville
US EPA ORD PARTNER US EPA ORD PARTNER US EPA ORD PARTNER US EPA ORD PARTNER
• Monitoring Lead• GMP Selection QA/QC
MONITORING IN LOUISVILLE MONITORING IN LOUISVILLE MONITORING IN LOUISVILLE MONITORING IN LOUISVILLE
CSO 130 RESULTS CSO 130 RESULTS CSO 130 RESULTS CSO 130 RESULTS
Option Gray Cost Green Cost
Total Cost POST AAOV
POST # OF / YR
Gray Only $1,077,000 $0 $1,077,000 0.67 MG
8
Green Only(Option 1 – GMPs 0, 10, 11, 13, 21)
$0 $129,000 $129,000 0.44 MG
7
Green Only(Option 2 – GMPs 0, 10, 11, 12,13, 14, 17,19, 21 )
$0 $342,000 $342,000 *Pending Final Model Run
*Pending Final Model Run
Existing AAOV Existing # OF / YR
0.84 MGD 9
Wrap UPWrap UP
Green Infrastructure can:•Be implemented on a site, neighborhood, or regional level•Help manage flooding and stormwater •Protect our streams•Be cost effective•Provide multiple benefits•Help communities meet environmental requirements•Improve public perception
