Green infrastructure Implementation - Michigan · Local green infrastructure City of Saginaw...
Transcript of Green infrastructure Implementation - Michigan · Local green infrastructure City of Saginaw...
Green InfrastructureIMPLEMENTATION
Russ Beaubien, P.E., CFM
OVERVIEW
LOCAL DESIGN APPLICATIONS
DRAINAGE DISTRICT APPLICATION
TRANSPORTATION APPLICATION
URBAN STREAM RESTORATION
FUTURE ISSUES WHICH MUST BE ADDRESSED AT SITE DEVELOPMENTS
Local green infrastructure
City of Saginaw Pollinator initiative
Janet H. Nash River Front Preserve 3 acre site
Increase in green space as the City of Saginaw de-urbanizes
Site re-developments implementing more green design
Implementing changes to storm water design criteria to encourage use of green infrastructure.
Need to provide education and outreach to developers, designers, engineers, reviewers
Janet H. Nash Riverfront Preserve
• 3 acre parking lot
• Now a 3 acre river meadow with walking paths, outside classroom area for SASA and a view
Site Design Bio-Swales
Completed Site
Local Projects – Numerous; variety of impacts; de-urbanization is coming:• City sponsored LID project to look at
CSO basins and lessening impact from de-urbanization
• Goal of 1,500 parcels cleaned up and converted to use in Pollinator Project with SBLC
• Roads in Ojibway and Wickes park being downsized for trails along the Saginaw River
• Housing being condemned and demolished, over 4,000 houses have been removed in the past 10 yrs.
• Old manufacturing sites being demolished & scrapped
• Land Bank is providing land to local homeowners in their “side lot” program to reduce imperviousness
County Drainage District Applications
Many County Drain Commissioners are implementing Green Infrastructure on projects
Berrien County, Lakeshore Drain
Hope College – Maplewood Inter-County Drain
Lake Shore Drain #285 drainage district map
PRIOR CONDITION - LAKESHORE DRAIN PHOTOS
Point of Ending Wet area close to drain near Nora’s Lane
Parcels close to drain near McKinley St.
View S.W. along drain
Barn on or along drain in Parcel N.E. of Paradise Villa
PARADISE VILLA
DRAINAGE PROBLEMS
PARADISE VILLA
BEFORE
AFTER
RESIDENCE
DESIGN FACTORS
Fit Design According to Existing Conditions (Resource Protection, “Retrofitting”)
Existing Pathway
NON-TRADITIONAL (LOW-IMPACT) DESIGN
N
Smallenburg Park and Hope College Athletic Fields
Discharge to Maplewood Drain storm sewer
Previous unfiltered discharge to Maplewood IC Drain
Hope Creek
Vegetated swales to filter runoff and protect top of banklocated in area of two stage channel
Hope Creek
Rain Garden A now retains and filters runoff from Bouws Pool and commercial property
Transportation Projects - Residential
Infiltration Swales
• 128 Individual Swales• Constructed on Both Sides
of Road ROW• 12-24” Perforated
Underdrain• Planted w/ Tall Fescue
Turfgrass• Capture and Treat Runoff• Localized Detention and
Promotes Infiltration
Analysis of Infiltration Swales
• Individual basins/ individual districts/ individual overflows
• Design for first flush volume to capture and infiltrate
• Design for swales to contain 100 Year recurrence events between road and sidewalk (Overflows in use)
• SWMM Modeling/Spreadsheet Calculations• Modeled 128 contributing areas to 128 swales• Modeled infiltration rate• Modeled overflow to collection system• Modeled collection system and outlet pond
Swale effectiveness modeling map 1
Swale effectiveness modeling map 2
Swale effectiveness modeling map 3
Swale effectiveness modeling map 4
Swale effectiveness modeling map 5
Swale effectiveness modeling map 6
Swale effectiveness modeling map 7
Before and afterBefore
After
URBAN STREAM RESTORATION
Traver Creek Drain Washtenaw County
• 3,300 feet of channel
• 6.5 acres of wetlands created
• 10+ acres of native area restoration
• 79 trees planted
• 347 shrubs planted
• 30,000 cubic yards of earth moved
• 50+ species of wildflowers planted
• Aquatic habitat structures installed
Traver Creek Drain – Floodplain Creation
What is a two-stage channel?
Where should I consider a two-stage channel?
• Adequate grade
• Consistent base flow
• Adequate space
• Public buy-in
• Stream Mitigation
Traver Creek Drain – Wetland Plantings
• Emergent/Submergent
• Low Growing
• Sedge Meadow
• Wet Meadow /Floodplain
• Native Prairie
Traver Creek Drain – Meandering Channel
Traver Creek Drain – Grade Stabilization
FINAL ISSUE WITH GREEN INFRASTRUCTURE
• Need buy in from the public or the developer
• There needs to be an Operation & Maintenance plan with a budget for implementation – costs can range from $20 to $130+ per square foot
• Need training for the staff responsible for O&M
• Who will overview if this is a private system of BMPs?
• Education and Outreach is starting but needs expansion
Questions