Contents. Section 1 Data Review and Discussion. Section 2 Methodology

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1 Contents Section 1 Data Review and Discussion 1.1 Introduction and Background Stormwater Management Plan Two Mile Branch Watershed Management Plan NPDES Mapping Efforts Stormwater Utility Implementation Flooding Complaints Regulatory Coordination FEMA Flood Maps Section 2 Methodology 2.1 Stormwater Modeling Hydrologic Parameters Topographic Data Hydrologic Units (HUs) Rainfall Intensities and Quantities Hydrologic Parameters Infiltration Rates and Capacities Soils Types and Characteristics Impervious Areas Land Use Depression Storage Hydraulic Parameters Field Investigations, As-Built Data and Additional Survey Model Schematic Stage-Area Relationships Conduits Culverts Natural Channels Bridges and Roadway Overflows Boundary Conditions Withlacoochee River Mud Creek Swamp Model Calibration/Verification Water Quality Parameters Total Suspended Solids (TSS) Reduction Goal and TSS Evaluation Channel Bank Erosion Evaluation Alternatives Evaluation Level of Service Construction Costs i

2 2.5.3 Operation and Maintenance Costs Project Ranking Section 3 Sugar Creek Geomorphologic Assessment 3.1 Fundamentals of Fluvial Geomorphology Major Models Lane s Relationship Channel Evolution Evaluating Channel Changes in Cross Section Meander Formation and Migration Evaluating Channel Change in Plan Form Profile Analysis Temporal and Spatial Implications Sediment Transport Methods of Geomorphic Investigation Geomorphic Background Investigation Geomorphic Field Investigation Sugar Creek Evaluation Geomorphic Field Investigation Major Reaches of the Main Stem Channel Geometry Boundary Material Hydraulics Analysis of Water Surface Profile Tractive Shear Hydraulic Model and Geomorphic Process Sediment Transport Methods of Management Watershed-Scale Stability Arrest Channel Incision Local Stability Prevents Incision and Protects Infrastructure Section 4 Withlacoochee Basin 4.1 Browns Canal Introduction Sub-basin Information Existing Conditions Water Quantity Problem Areas Secondary System (Infrastructure) Problem Areas Results Water Quantity Results Total Suspended Solids (TSS) and Channel Bank Erosion Evaluation Level of Service Summary Alternatives Evaluation ii

3 4.2 Cherry Creek & Stillhouse Branch Introduction Sub-basin Information Existing Conditions Water Quantity Problem Areas Results Water Quantity Results Total Suspended Solids Evaluation Level of Service Summary Alternatives Evaluation Hightower Creek Introduction Sub-basin Information Existing Conditions Water Quantity Problem Areas Results Water Quantity Results Total Suspended Solids (TSS) and Channel Bank Erosion Evaluation Level of Service Summary Alternatives Evaluation One Mile Branch Introduction Physical Description Existing Conditions Problem Areas Results Water Quantity Results Total Suspended Solids (TSS) and Channel Bank Erosion Evaluation Level of Service Summary Alternatives Evaluation Sugar Creek Introduction Sub-basin Information Existing Conditions Water Quantity Problem Areas Results Water Quantity Results Total Suspended Solids (TSS) and Channel Bank Evaluation Level of Service Summary Alternatives Evaluation iii

4 4.6 Two Mile Branch Introduction Sub-basin Information Existing Conditions Water Quantity Problem Areas Results Water Quantity Results Total Suspended Solids (TSS) and Channel Bank Erosion Evaluation Level of Service Summary Alternatives Evaluation Three Mile Branch Introduction Sub-basin Information Physical Description Existing Conditions Water Quantity Problem Areas Results Water Quantity Results Total Suspended Solids Evaluation Level of Service Summary Alternatives Evaluation Section 5 Mud Swamp Creek Basin 5.1 Dukes Bay Canal Introduction Sub-basin Information Physical Description Existing Conditions Water Quantity Problem Areas Results Water Quantity Results Total Suspended Solids Evaluation Level of Service Summary Alternatives Evaluation Section 6 Summary and Recommendations 6.1 Stormwater Modeling Infrastructure Flooding iv

5 Appendices Table of Contents Appendix A Permitting Coordination Meeting Minutes Appendix B SWMM Model Results Appendix C Stormwater Committee Meeting Minutes Appendix D Park Avenue Culvert Evaluation Appendix E Creekside Assistance Appendix F Browns Canal PDR Appendix G Early Out Projects Appendix H Benchmark Network Documentation Appendix I Baytree Road Culvert Improvements (Trash Collection Device Design) Appendix J Hydrologic Parameters for Hydrologic Units per Sub basin Appendix K Flood Estimates at Withlacoochee WWTP Memorandum v