Sample Plan Document Main Street Dam Removal & Scioto Greenways

Sample Plan Document Main Street Dam Removal & Scioto Greenways

Calgary Riverwalk in Calgary, Alberta SAMPLE PLAN DOCUMENT MAIN STREET DAM REMOVAL & SCIOTO GREENWAYS FEASIBILITY STUDY 1.0 INTRODUCTION AND BACKGROUND ............................................................................. 1 1.1 Project Partners ........................................................................................................... 1 1.2 Purpose of the Study ................................................................................................... 1 1.3 Project goals ................................................................................................................ 1 1.4 Project Area and Existing Conditions ........................................................................... 2 1.4.1 Project Extents ...................................................................................................... 2 1.4.2 Existing River Conditions ...................................................................................... 2 1.4.3 Existing Bridges .................................................................................................... 3 1.4.4 Existing Utilities ..................................................................................................... 4 1.5 Property Ownership ..................................................................................................... 6 1.5.1 Main Street Bridge ................................................................................................ 7 1.5.2 Rich Street Bridge ................................................................................................. 7 Table of Contents 1.5.3 Broad Street Bridge .............................................................................................. 7 1.5.4 Railroad Bridges ................................................................................................... 7 1.5.5 Adjacent Properties............................................................................................... 7 2.0 HISTORIC PRESERVATION .............................................................................................. 8 2.1 History of the River in Downtown ................................................................................. 8 2.2 Cultural Resources Reports ......................................................................................... 9 2.2.1 Red Flag Summary Report ..................................................................................10 2.2.2 Historical Maps ....................................................................................................11 2.2.3 Literature Review .................................................................................................13 2.3 OHPO Requirements and Next Steps .........................................................................17 3.0 ECOLOGY .........................................................................................................................19 3.1 Use Attainment Designation ........................................................................................19 3.1.1 Habitat Assessment .............................................................................................19 3.1.2 Qualitative Habitat Evaluation Index ....................................................................19 3.2 Fish .............................................................................................................................21 3.3 Mussels ......................................................................................................................24 3.4 Conclusion ..................................................................................................................28 4.0 HYDROGEOLOGICAL EVALUATION ..............................................................................29 4.1 Introduction .................................................................................................................29 4.1.1 Historical Information Review ...............................................................................29 4.2 Study Area Characterization and Description ..............................................................30 4.2.1 General Description .............................................................................................30 4.3 Bedrock Characterization ............................................................................................30 4.4 Characterization of the Unconsolidated Sediments .....................................................31 4.5 Hydrogeology of the Study Area .................................................................................32 4.5.1 Groundwater Flow-Conceptual Model ..................................................................33 4.1 Summary of findings ...................................................................................................34 5.0 SEDIMENTS ......................................................................................................................35 5.1 Sediment Sampling .....................................................................................................35 5.2 Sediment Sampling Field Procedures and Methodology .............................................35 5.3 Lab Results and Analysis ............................................................................................36 5.4 Coordination with OEPA and Next Steps ....................................................................37 5.5 Sediment Management ...............................................................................................39 6.0 CONCEPT PLAN ...............................................................................................................41 main street dam removal study feasibly i 6.1 Dam Removal .............................................................................................................41 6.2 River and Riparian Restoration ...................................................................................42 6.2.1 Project Area and Watershed Assessment ............................................................42 6.2.2 Design Constraints...............................................................................................43 6.2.3 Regional and Local Relationships ........................................................................43 6.2.4 Design .................................................................................................................45 6.3 Park Features .............................................................................................................47 7.0 HYDROLOGY AND HYDRAULICS ...................................................................................52 7.1 Introduction .................................................................................................................52 7.2 Existing Scioto River Hydrologic and Hydraulic Studies ..............................................52 7.3 Hydrologic Analysis .....................................................................................................52 7.3.1 Flow Discrepancy ................................................................................................52 7.3.2 Drainage Area Weighting .....................................................................................53 Table of Contents 7.3.3 Standard Project Flood ........................................................................................54 7.3.4 Results.................................................................................................................55 7.4 Hydraulic Analysis.......................................................................................................55 7.4.1 Existing Conditions Model ....................................................................................55 7.4.2 Post-Project Conditions Model .............................................................................56 7.4.3 Standard Project Flood ........................................................................................56 7.5 Results ........................................................................................................................57 7.6 Recommended Next steps ..........................................................................................58 8.0 STRUCTURES AND BRIDGES .........................................................................................59 8.1 Structural Understanding of Bridges ...........................................................................60 8.1.1 CSX/Norfolk Southern Shared Railroad Bridge (downstream of Main Street Dam) 61 8.1.2 Main Street Bridge ...............................................................................................62 8.1.3 Rich Street Bridge ................................................................................................63 8.1.4 Broad Street Bridge .............................................................................................64 8.1.5 Norfolk Southern Railroad Bridge .........................................................................65 8.1.6 CSX Railroad Bridge ............................................................................................66 8.1.7 State Route 315 Bridge ........................................................................................66 8.1.8 Souder Avenue Bridge .........................................................................................66 8.1.9 Interstate 670, On &

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