Third Ave CSO Integrated Green Infrastructure Neil Myers Williams Creek Consulting OWEA Annual Conference June 2013 For growing municipalities to be perceived as world class communities, each must move past the era of single objective spending and invest in programs and policies with multiple benefits. Learn how Green Infrastructure (GI) approaches to wet weather management create a range of benefits for the social, economic, and environmental health of a community.
AGENDA Green Infrastructure Overview How GI works in Urban Conditions Integrated Approach GI Project Analysis GI Project Selection Third Ave CSO Integrated GI
Green Infrastructure (GI) Best Management Practices Bioretention Cells Bioswales Constructed Wetlands Vegetated Wet Ponds Native Landscape Basins Raingardens Permeable Pavements Proprietary Technologies Filter Strips Infiltration Basins Rainwater Harvesting
Green Infrastructure Benefits» Combined sewer overflow mitigation» Reduction in total stormwater volume» Increased awareness about stormwater impacts» Increased green space» Sediment cleanup» Reduction in urban flooding Rain Garden Permeable Pavement Installation» Improved water quality» Traffic calming
FLOW HOW GI WORKS IN URBAN CONDITIONS REQUIRED GI STORAGE ALLOWABLE PEAK FLOW TIME
PERCENT ANNUAL REDUCTION HOW GI WORKS IN URBAN CONDITIONS 100% 90% 80% 70% 60% 50% PERVIOUS GUTTER ONLY ADD 18 HDPE % Peak Reduction Required ADD SUPPLEMENTAL RAIN GARDEN %IMPERVIOUS SENSITIVITY ANALYSIS Apply Peak Reduction Requirement to Applicable Soil Type 40% 30% 20% 10% 0% Annual Volume Silt Loam 75% Imp UD -2.5 Annual Rate Silt Loam 75% Imp UD -2.5 Annual Volume Silt Loam 65% Imp UD -2.5 Annual Rate Silt Loam 65% Imp UD -2.5 Annual Volume Silt Loam 85% Imp UD -2.5 Annual Rate Silt Loam 85% Imp UD -2.5 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 BMP STORAGE REQUIRED PER ACRE (CF/AC)
Street Rain Garden Street Rain Garden HIGH PERFORMANCE URBAN INFRASTRUCTURE Green Infrastructure is NOT just a drainage solution Dummy Node Model Node 6-inch Underdrain Model Node 18-inch Conduit U/S Weir Elevation: 3.5 ft Model Node Existing Modeled Combined Sewer
GI REQUIRES AN INTEGRATED APPROACH Owner Architect Landscape Architect Systems Engineer Civil/Ecological Engineer Scientist State Regulatory Agencies Local Regulatory Agencies Community Stakeholders
GI PROJECT ANALYSIS Prioritize Sites using Triple Bottom Line Approach» Engineering feasibility ranking» Integration into Proposed Capital Projects» Neighborhood outreach
FLOW (CFS) GI PROJECT SELECTION 292.4 CFS Engineering analysis» Cost effectiveness» Technical feasibility» Common Sense INFLOW AREA = 100 Ac PEAK ELEV = 104.32 STORAGE = 27.76 af 27.5 CFS TIME (HRS)
GI PROJECT SELECTION Capital Improvements Integration» Right of Way Sidewalks Utilities» Parks
GI PROJECT SELECTION Neighborhood outreach» CDC Meetings» Neighborhood stabilization» Private foundations
City of Columbus THIRD AVE CSO INTEGRATED GREEN INFRASTRUCTURE
3 rd AVE, EAST SIDE Project Location Project Goals Project Constraints Project Benefits GI Overview GI Concepts Next Steps AGENDA
3 rd Ave Basin Neighborhoods: South Campus Necko Dennison Place Victorian Village Weinland Park
3 rd AVE, EAST SIDE Project Goals» 25 acres of area controlled by GI - 15 CFS reduction at regulator - Equivalent to 20 acres of inflow redirection» Cost-effective GI solutions that maximize social & environmental benefits
3 rd AVE, EAST SIDE Project Constraints» Parking availability» Safety» Maintaining Livability» Street Trees» Right of Way Space» Avoiding High Traffic Roads INTERSECTION OF PENNSYLVANIA AVE & KING AVE
3 rd AVE, EAST SIDE Project Opportunities» Targeting areas in need of repair» Targeting areas with high visibility» Targeting contiguous drainage areas» Targeting areas with adequate drainage areas ALLEY B, EXISTING CONDITIONS AT 6 th AVE LOOKING NORTH
3 rd AVE, EAST SIDE Project Benefits» Public awareness about stormwater issues» Enhanced street character» Increased green space» Sediment reduction» Improved water quality» Traffic calming» Reduction in urban flooding
ANALYSIS PROCESS: 3 rd AVE, EAST SIDE MEETING GOALS WITHIN CONSTRAINTS A balance between technical design and livable communities
ANALYSIS PROCESS: 3 rd AVE, EAST SIDE Technical Selecting BMP that best fits site characteristics Use of manufactured systems when space is tight (Silva Cell) Avoiding roads with steep slopes Size of contributing watershed Adequate space within the city-owned right-ofway Constructability Utility conflicts Contiguous areas for economies of scale and ease of construction Livability Avoiding areas with significant street parking Maintaining adequate parking in design Ensuring walkable space Retaining mature/healthy tree canopy Providing 2 step out area if rain garden is adjacent to street parking area Enhanced street character Traffic calming
ANALYSIS PROCESS: 3 rd AVE, EAST SIDE EVALUATION CRITERIA LOCATION AND PROJECT VISIBILITY NEED FOR STREET REPAIRS EASE OF CONSTRUCTION STREEP SLOPE PARKING WIDTH OF LANDSCAPE BUFFER CONTRIBUTING WATERSHED TREES
ANALYSIS PROCESS: 3 rd AVE, EAST SIDE Evaluation Criteria
ANALYSIS PROCESS: 3 rd AVE, EAST SIDE Evaluation Criteria, Continued
ANALYSIS PROCESS: 3 rd AVE, EAST SIDE
GI OVERVIEW: 3 rd AVE, EAST SIDE 5 ZONES Zones are contiguous areas of watershed that are amenable for GI in terms of constructability and economies of scale
TOOL BOX: 3 rd AVE, EAST SIDE RAIN GARDENS PERVIOUS ALLEYS PERVIOUS PARKING SILVA CELLS
GI CONCEPTS: 3 rd AVE, EAST SIDE RAIN GARDENS 5 th AVENUE, ZONE 4 F F
GI CONCEPTS: CURB DESIGN RAIN GARDENS 5 th AVENUE, ZONE 4 http://water.epa.gov Example of Raised Curb http://chesapeakestormwater.net Example of Flush Curb
GI CONCEPTS: CURB DESIGN RAIN GARDENS 5 th AVENUE, ZONE 4 EXAMPLE OF BURRIED CURB
GI CONCEPTS: 3 rd AVE, EAST SIDE RAIN GARDENS 5 th AVENUE, ZONE 4 Existing Road Looking West 5 th Ave F F
GI CONCEPTS: 3 rd AVE, EAST SIDE GREEN ALLEY ALLEY B, ZONE 2 B B
GI CONCEPTS: 3 rd AVE, EAST SIDE GREEN ALLEY ALLEY B, ZONE 2 ALLEY B, EXISTING CONDITIONS AT 6 th AVE LOOKING NORTH EXAMPLE OF GREEN ALLEY FROM CDOT S GREEN ALLEY HANDBOOK, 2010
GI CONCEPTS: 3 rd AVE, EAST SIDE GREEN ALLEY ALLEY B, ZONE 2 Existing Alley Looking West B B
GI CONCEPTS: 3 rd AVE, EAST SIDE SILVA CELL EUCLID AVE, ZONE 2 C C www.deeproot.com Silva Cell Diagram TREE BOX (SILVA CELL) RAIN GARDEN
GI CONCEPTS: 3 rd AVE, EAST SIDE SILVA CELL
GI CONCEPTS: 3 rd AVE, EAST SIDE SILVA CELL EUCLID AVE, ZONE 2 C C EXISTING ROAD LOOKING WEST EUCLID AVE
GI CONCEPTS: 3 rd AVE, EAST SIDE E E PERVIOUS PAVEMENT RAIN GARDEN BUMPOUTS PENN AVE, ZONE 4 PENNSYLVANIA AVE, LOOKING SOUTH
EXAMPLE CONSTRUCTION PROJECT NORTH STREET: LAFAYETTE, INDIANA UNDERGROUND STORAGE RESERVOIRS ROLLING OUT FILTER STRIP MECHANICALLY LAYING PERMIABLE BRICKS
GI CONCEPTS: 3 rd AVE, EAST SIDE PERVIOUS PAVEMENT RAIN GARDEN BUMPOUTS PENN AVE, ZONE 4 PENNSYLVANIA AVE, LOOKING NORTH E E
GI OVERVIEW: 3 rd AVE, EAST SIDE 2 ZONES Determined that with these 2 zones, the target volume and peak reduction goals could be met
NEXT STEPS» Finalize of Business Case Evaluation and Preliminary Design Report» Assist with Development of Construction Documents
Third Ave CSO Integrated Green Infrastructure Neil Myers Principal OFFICES IN: INDIANAPOLIS, INDIANA COLUMBUS, OHIO ST. LOUIS, MISSOURI +1 317 423 0690 www.williamscreek.net nmyers@williamscreek.net