Two Sides of the Green Infrastructure Coin Jaren Hiller, PE, LEED AP Nathan Guequierre May 5, 2016
Background Citywide Stormwater Planning WinSLAMM Analysis No Control Existing Conditions Proposed Conditions o Proposed BMPs
Background Citywide Stormwater Planning Existing BMPs Street Sweeping Catch Basins Hydro-dynamic Separators Wet Ponds Underground vaults Bioretention Cells
Background Citywide Stormwater Planning Identified Potential Proposed BMPs High concentration on non-point pollution (TSS) o Land use type Drainage basin size Land available for BMP Integrate into existing drainage system Integrate into other infrastructure planning o Road, sewer / water reconstruction Multiple benefits o Drainage improvements o Flood control
Background Pershing Drive / Pershing Park Identified Potential Proposed BMPs High concentration on non-point pollution (TSS) o Parking area / roadway Open space available for BMPs Road and Parking Lot Reconstruction Drainage improvements to roadway Funding source o EPA GLRI Shoreline Cities Grant $250K for Green Infrastructure (50% Match)
Project Site Overview
Project Planning Circa 1937 Historic Considerations o Filled land Filled land o Historic Landfill designation o Obtain permitting and exemption from the WDNR for infiltration
Project Planning
Project Site Overview Boat Launch Parking Lot Library Parking Lot Boat Launch Bioretention Library Bioretention Pershing Drive Bioretention Pershing Drive
Pershing Drive Design ½ mile road reconstruction o ~7 above average lake level o 0.3 +/- elevation change 1,500 feet of linear bioretention cell
Pershing Drive Design Existing Inlet
Pershing Drive Design
Pershing Drive Design Removed 7, and placed 4 Asphalt w/ 3 Base Ribbon Curb 1.25 Mill and Overlay
Pershing Drive Design Maintain Outlet Above Lake Level
Pershing Drive Design Existing Inlet
Pershing Drive Design - Drainage
Pershing Drive Design - Vegetation Salt Tolerant Natives within Mix Black-eye Susan Little Bluestem Switchgrass Grass Buffer Existing Inlet
Pershing Drive Design Earthwork Management
Pershing Drive Design
Pershing Drive Design
Project Site Overview Library Parking Lot Library Bioretention
Library Parking Lot Design Existing Inlet
Library Parking Lot Design Existing Inlet
Project Site Overview Boat Launch Parking Lot Boat Launch Bioretention
Boat Launch Parking Lot Design Surface Runoff Directly into lake
Boat Launch Parking Lot Design
Boat Launch Parking Lot Design Overflow Standpipe / Cleanout Concrete Flume Underdrain Existing Storm Sewer Connection Backflow Prevention Valve
Boat Launch Parking Lot Design Concrete Flume Underdrain Overflow Standpipe / Cleanout
Considerations During Design / Construction / Post-Construction
Design Considerations Winter Operations Mechanical Plug Drainage with frozen ground Snow management o Bioretention = Snow storage area? o Education / signage
Design Considerations BMP Layout Consider Site Use Pedestrian path = Pedestrian movement Path of Least Resistance
Construction Considerations Material Segregation Include material management in specifications Discuss in preconstruction conference Try to use experience contractor o Pre-qualify?
Post-Construction Considerations Native Vegetation Management o Include establishment maintenance in contract Long-term Maintenance o City-wide O&M Plan for all BMPs o Integrate into CIP
WinSLAMM Water Quality Modeling Continuous simulation model o One year of rain records o Yields annual pollutant loading o Estimates annual pollutant reductions
WinSLAMM Water Quality Modeling Bioretention Cell ID Bioretention Cell Location Description Bioretention Surface Area (sq. ft.) Drainage Area (ac) Annual TSS In (lbs) Annual TSS Out (lbs) TSS Reduction (%) 1 Pershing Drive - South 2,180 9.8 1,335 277 79 2 Pershing Drive - Middle 1,430 4.8 979 152 84 3 Pershing Drive - North 1,350 2.76 1,274 248 81 4 Parking Lot #5 940 1.1 618 130 79 5 Boat Launch Parking Lot 1,000 1.77 1,027 335 67
Project Funding and Costs Multiple Sources o Racine Parks/Recreation Department o Racine Parking System o Racine Stormwater Utility o Wisconsin Waterway Grant o GLRI Grant Total Project Construction Costs = $1.2M GI (GLRI) Eligible Const. Costs = $475K o Includes curb and gutter, piping, soil management o (~$310K actual GI items)
Thank You Jaren Hiller, PE, LEED AP
Neighbor to Neighbor Building a Fresh Coast Network
Milwaukee Metropolitan Sewerage District MMSD Serves: 1.1 Million Customers 28 Municipalities 411 Square Miles MMSD Protects the Public & Lake Michigan: Convey/Store/Reclaim Wastewater Manage Flooding Make Fertilizer
The MMSD Region s Sewers 300 Miles of MMSD Sewer 3,000 Miles of Municipal Sewer 3,000 Miles of Private Sewer
MMSD 2035 Vision Capture first halfinch of rainfall across the impervious area Private Buildings and Parking Lots 59% of impervious in the Region Support regional efforts
Fresh Coast 740 Managing water where it falls Opening Communication Building on existing efforts Community events Private Property I/I Parallel urban and suburban initiatives
GREEN SUMMER IN BROWN DEER & WEST ALLIS
Green Infrastructure in Milwaukee s Suburbs
Principles of Social Marketing Peer to peer interaction That s how we do it around here Leverage the interest of champions in existing social networks
Three-Channel Approach Information. Social. Installation.
Three-Channel Approach
Information Activities
Social Activities
Installation Activities
Project Outcomes over Two Summers Outcome Target Actual Attendance Water Storage News Articles 6 4 TV Coverage 0 2 Community Events 19 16 239 House Parties 30 19 174 Rain Barrels 95 187 9,850 gal Rain Gardens 28 36 13,674 gal Soil Amendments 12,000 sf 11,000 sf 2,200 gal Public Artwork 1 2
Improving the Program Planning & Budgeting Don t underestimate demand $1,100/rain garden + $250/garden for planning $0.15/square foot for soil amendments Could be reduced with more gardens and amendments Recommendations Plan and market a defined number of installs Have materials ready to go before you start Get some interns
Improving the Program
Improving the Program Refining the Message Surveyed house party attendees Knew barrels, not other methods Motivated by aesthetics and altruism Already understand that there are costs associated with managing stormwater Recommendations Avoid green infrastructure terminology Lead discussion with rain barrels Don t be afraid to talk about money
Improving the Program Outreach Methods Spurring Action Event attendance: 57% House parties: 67% Neighbor referral: 80% Recommendations Prioritize peer to peer contact, not brochures Consider a block captain approach Identify key partners
Improving the Program Stakeholder Communications Contact list grew to over 100 names quickly Required active management Too many points of contact Recommendations Use a case manager approach Use interns for install only stakeholders One staff person and cell phone devoted to list management
Improving the Program Network Sustainability Difficult to identify a champion to maintain network People can t envision soil amendments Recommendations Allocate funding to maintain Facebook page over autumn and winter Reach out to participants with rain garden info Create a demonstration soil amendment
Public Artwork
Neighborhood Networks
Green Summer Photo Album