OWEA Watershed Workshop-October 30 th, 2014 North Street Reconstruction & Integrated Stormwater Management System Ted Blahnik, PE Principal-Williams Creek Consulting
North Street: A Case Study for Integrated Infrastructure
Presentation Agenda City of Lafayette GI Master Plan Overview North Street Selection Concept Development Pre-design Construction Planning Construction Lessons Learned
Lafayette GI Feasibility and Prioritization Study Capital Improvement Project Integration Dual Purposing of Stormwater Utility and CIP Dollars Right of Way/Public Lands CSO Abatement Street and Walk repair needs Neighborhood revitalization
Lafayette GI Feasibility and Prioritization Study Result: North Street (9th to Erie) Best capital investment per annual gallon removed Non-stormwater CIP needs Street Walks Water line Water service connections Gas
Why North Street?
Deteriorated Pavement Conditions
Interesting Drainage Conditions
Safety and Accessibility / ADA
Right of Way / Utility Issues
North Street Reconstruction Project Goals Abate stormwater runoff to combined collection system Improve approximately 3,000 ft of existing brick street Maintain & enhance historic neighborhood character Replace trees identified for removal in City Tree Survey Replace existing water and gas services and update meters Address ADA compiance issues Plan for multiple phase construction
3rd Ave Erie Street North Street Reconstruction Concept Development Consolidated GI North Street
Community Outreach and Education
North Street Reconstruction Concept Development Material selection Historic aesthetic - Community desire to maintain look and feel of street Paver qualities durability, warranty, color & texture options
North Street Pre-Design Full cross section for pavers with intermittent deep storage sections
North Street Pre-Design SWMM Modeling - Hydrology Microwatersheds delineated by inlet to combined system Topography from GIS Connectivity refined during field recon Both continuous annual storm and individual events modeled Soil infiltration characteristics taken from existing city combined sewer SWMM model for areas with similar SCS soil types
North Street Pre-Design SWMM Modeling - Storage Full street permeable paver section Standard 11 inch paver section with washed subgrade 24 deep section storage cells placed to mitigate utility conflicts 28 supplemental rain gardens where practicable Utilities located, surveyed, mapped, and potholed
% Reduction North Street Pre-Design Volume Removal (MGAL) Peak rate (CFS) SWMM RESULTS Existing Proposed Annual Runoff 8.8 2.2 Annual Storm 5.5 4.5 10yr, 24-hr Huff 4.1 3.2 SWMM Modeling Results Peak Rate reductions up to 40% in some areas, less than 10% in others. Avg Rate Reduction app. 30% Annual Volume Peak rate
North Street Construction Planning Deconstruction Plan Everything Must Go (Almost everything) Bricks to be saved from landfill Trees to keep/to remove designated by city ecologist (emerald ash bore, disease, or general unhealthiness)
North Street Construction Planning Transportation Engineering set, not just stormwater design
North Street Construction Planning Maintenance of traffic and property access Alley loading Temporary drives Unique commercial (glass) delivery issues Pedestrian wayfinding
North Street Construction Planning Resolve utility conflicts and improve existing connections Unknown condition and exact number of existing services
North Street Construction Planning Meet Updated ADA Requirements
North Street Construction Planning Generate plan, profile, cross-section, perspective, and rendering of many features for instructional level CDs
North Street Construction Planning Landscape architecture engineering details and specifications Reuse of historic bricks between street and walk Non-standard (lack of) subgrade compaction Seat walls with rain gardens with roof drain connections New Brick to Old Asphalt/Concrete/Brick intersection transitions
North Street Construction Subgrade excavation and preparation
North Street Construction Phase 1 Unknown Conditions (even after excavating?)
North Street Construction Phase 1 Manhole replacement
North Street Construction Phase 1 Downspout disconnection
North Street Construction Phase 1 Flow through rain garden design
North Street Construction Phase 1 Filter fabric installation
North Street Construction Phase 1 Almost ready for pavers
North Street Construction Phase 1 Project Estimate (~ 3000 lf) = $3.2M Phase 1 (~ 2000 lf) = $1.7M App. 14 acres of runoff management 76% of runoff removed from combined system equivalent to 6.6M gallons annually 30% Annual Peak Flow Reduction $0.50 per gallon removed capital investment App. 100,000 sq ft of ROW improvements including 70,000 sq ft of GI improvements Net Annual Cost of Treatment Reduction
North Street Construction Phase 1 Additional Benefits: 1. Reuse of existing materials on similar streets 2. Improved pedestrian connectivity 3. Increased traffic and vehicular control 4. Restorative impact on regional water quality 5. Reduced energy usage at wastewater treatment plant 6. Improved community corridor and streetscape 7. Enhance public health and safety
North Street Reconstruction Lessons Learned: 1. Stakeholder outreach opportunities are a premium 2. Integrate utility upgrades wherever possible 3. Additional detail in construction documents needed to keep bids in line with engineering estimates and change orders to a minimum during construction
North Street Reconstruction Online Information www.lafayettenorthstreet.com Ted Blahnik +1.317.423.0690 tblahnik@williamscreek.net Jenny Leshney +1.765.807.1050 jleshney@lafayette.in.gov
Thank You! Ted Blahnik, PE Principal OFFICES IN: INDIANAPOLIS, INDIANA COLUMBUS, OHIO ST. LOUIS, MISSOURI +1 317 423 0690 www.williamscreek.net tblahnik@williamscreek.net