North Street Reconstruction & Integrated Stormwater Management System

Transcription

1 OWEA Watershed Workshop-October 30 th, 2014 North Street Reconstruction & Integrated Stormwater Management System Ted Blahnik, PE Principal-Williams Creek Consulting

2 North Street: A Case Study for Integrated Infrastructure

3 Presentation Agenda City of Lafayette GI Master Plan Overview North Street Selection Concept Development Pre-design Construction Planning Construction Lessons Learned

4 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

5 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

6 Why North Street?

7 Deteriorated Pavement Conditions

8 Interesting Drainage Conditions

9 Safety and Accessibility / ADA

10 Right of Way / Utility Issues

11 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

12 3rd Ave Erie Street North Street Reconstruction Concept Development Consolidated GI North Street

13 Community Outreach and Education

14 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

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29 North Street Pre-Design Full cross section for pavers with intermittent deep storage sections

30 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

31 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

32 % Reduction North Street Pre-Design Volume Removal (MGAL) Peak rate (CFS) SWMM RESULTS Existing Proposed Annual Runoff Annual Storm yr, 24-hr Huff 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

33 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)

34 North Street Construction Planning Transportation Engineering set, not just stormwater design

35 North Street Construction Planning Maintenance of traffic and property access Alley loading Temporary drives Unique commercial (glass) delivery issues Pedestrian wayfinding

36 North Street Construction Planning Resolve utility conflicts and improve existing connections Unknown condition and exact number of existing services

37 North Street Construction Planning Meet Updated ADA Requirements

38 North Street Construction Planning Generate plan, profile, cross-section, perspective, and rendering of many features for instructional level CDs

39 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

40 North Street Construction Subgrade excavation and preparation

41 North Street Construction Phase 1 Unknown Conditions (even after excavating?)

42 North Street Construction Phase 1 Manhole replacement

43 North Street Construction Phase 1 Downspout disconnection

44 North Street Construction Phase 1 Flow through rain garden design

45 North Street Construction Phase 1 Filter fabric installation

46 North Street Construction Phase 1 Almost ready for pavers

47 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

48 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

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62 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

63 North Street Reconstruction Online Information Ted Blahnik Jenny Leshney

64 Thank You! Ted Blahnik, PE Principal OFFICES IN: INDIANAPOLIS, INDIANA COLUMBUS, OHIO ST. LOUIS, MISSOURI