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