Two Sides of the Green Infrastructure Coin. Jaren Hiller, PE, LEED AP Nathan Guequierre

Transcription

1 Two Sides of the Green Infrastructure Coin Jaren Hiller, PE, LEED AP Nathan Guequierre May 5, 2016

2 Background Citywide Stormwater Planning WinSLAMM Analysis No Control Existing Conditions Proposed Conditions o Proposed BMPs

3 Background Citywide Stormwater Planning Existing BMPs Street Sweeping Catch Basins Hydro-dynamic Separators Wet Ponds Underground vaults Bioretention Cells

4 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

5 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)

6 Project Site Overview

7 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

8 Project Planning

9 Project Site Overview Boat Launch Parking Lot Library Parking Lot Boat Launch Bioretention Library Bioretention Pershing Drive Bioretention Pershing Drive

10 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

11 Pershing Drive Design Existing Inlet

12 Pershing Drive Design

13 Pershing Drive Design Removed 7, and placed 4 Asphalt w/ 3 Base Ribbon Curb 1.25 Mill and Overlay

14 Pershing Drive Design Maintain Outlet Above Lake Level

15 Pershing Drive Design Existing Inlet

16 Pershing Drive Design - Drainage

17 Pershing Drive Design - Vegetation Salt Tolerant Natives within Mix Black-eye Susan Little Bluestem Switchgrass Grass Buffer Existing Inlet

18 Pershing Drive Design Earthwork Management

19 Pershing Drive Design

20 Pershing Drive Design

21 Project Site Overview Library Parking Lot Library Bioretention

22 Library Parking Lot Design Existing Inlet

23 Library Parking Lot Design Existing Inlet

24 Project Site Overview Boat Launch Parking Lot Boat Launch Bioretention

25 Boat Launch Parking Lot Design Surface Runoff Directly into lake

26 Boat Launch Parking Lot Design

27 Boat Launch Parking Lot Design Overflow Standpipe / Cleanout Concrete Flume Underdrain Existing Storm Sewer Connection Backflow Prevention Valve

28 Boat Launch Parking Lot Design Concrete Flume Underdrain Overflow Standpipe / Cleanout

29 Considerations During Design / Construction / Post-Construction

30 Design Considerations Winter Operations Mechanical Plug Drainage with frozen ground Snow management o Bioretention = Snow storage area? o Education / signage

31 Design Considerations BMP Layout Consider Site Use Pedestrian path = Pedestrian movement Path of Least Resistance

32 Construction Considerations Material Segregation Include material management in specifications Discuss in preconstruction conference Try to use experience contractor o Pre-qualify?

33 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

34 WinSLAMM Water Quality Modeling Continuous simulation model o One year of rain records o Yields annual pollutant loading o Estimates annual pollutant reductions

35 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, , Pershing Drive - Middle 1, Pershing Drive - North 1, , Parking Lot # Boat Launch Parking Lot 1, ,

36 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)

37 Thank You Jaren Hiller, PE, LEED AP

38 Neighbor to Neighbor Building a Fresh Coast Network

39 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

40 The MMSD Region s Sewers 300 Miles of MMSD Sewer 3,000 Miles of Municipal Sewer 3,000 Miles of Private Sewer

41 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

42 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

43 GREEN SUMMER IN BROWN DEER & WEST ALLIS

44 Green Infrastructure in Milwaukee s Suburbs

45 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

46 Three-Channel Approach Information. Social. Installation.

47 Three-Channel Approach

48 Information Activities

49 Social Activities

50 Installation Activities

51 Project Outcomes over Two Summers Outcome Target Actual Attendance Water Storage News Articles 6 4 TV Coverage 0 2 Community Events House Parties Rain Barrels ,850 gal Rain Gardens ,674 gal Soil Amendments 12,000 sf 11,000 sf 2,200 gal Public Artwork 1 2

52 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

53 Improving the Program

54 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

55 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

56 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

57 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

58 Public Artwork

59 Neighborhood Networks

60 Green Summer Photo Album