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Nancy Creek Watershed Improvement Plan

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Nancy Creek Watershed Improvement Plan Nancy Creek Watershed Improvement Plan SUMMER 2016 Prepared for the City of Brookhaven, Georgia City of Brookhaven Nancy Creek Watershed Improvement Plan TABLE OF CONTENTS List of Tables .................................................................................................................................................................. 4 List of Figures ................................................................................................................................................................ 5 Acknowledgements ........................................................................................................................................................ 7 Executive Summary ....................................................................................................................................................... 8 Chapter 1: Background ................................................................................................................................................ 12 1.1. Objectives ......................................................................................................................................................... 12 1.2. Watershed Description ..................................................................................................................................... 12 1.2.1. Subwatersheds .......................................................................................................................................... 13 1.3. Land Use .......................................................................................................................................................... 17 1.4. Water Quality Concerns .................................................................................................................................... 19 1.4.1. State 303(d) List of Impaired Waters ......................................................................................................... 19 1.4.2. Total Maximum Daily Loads ...................................................................................................................... 20 1.4.3. Other Watershed Concerns ....................................................................................................................... 20 1.4.4. Murphey Candler Lake .............................................................................................................................. 23 1.5. Regulatory Framework ..................................................................................................................................... 24 1.5.1. Municipal Separate Storm Sewer System (MS4) Permit ........................................................................... 24 1.5.2. Metropolitan North Georgia Water Planning District (MNGWPD) .............................................................. 24 1.5.3. DeKalb County Watershed Protection Plan ............................................................................................... 25 1.5.4. Georgia Rules for Dam Safety................................................................................................................... 25 1.6. Watershed Improvement Plan Development Process ...................................................................................... 26 1.7. Watershed Improvement Plan Overview .......................................................................................................... 26 Chapter 2: Watershed Investigation and Analysis ........................................................................................................ 27 2.1. Assessment of Available Water Quality Data ................................................................................................... 27 2.2. Watershed Modeling of Baseline Conditions .................................................................................................... 31 2.2.1 Model Inputs ............................................................................................................................................... 33 2.2.2. Model Calibration and Results ................................................................................................................... 33 2.3. Stream Walk Methodology and Results ............................................................................................................ 36 2.3.1. Stream Walk Methodology ........................................................................................................................ 36 2.3.2. Results ...................................................................................................................................................... 38 2.4. Murphey Candler Lake Sampling ..................................................................................................................... 40 2.4.1. Murphey Candler Lake Water Chemistry Sampling Results ...................................................................... 40 August 2016 Page 2 City of Brookhaven Nancy Creek Watershed Improvement Plan 2.4.2. Murphey Candler Lake Water and Sediment Depth Measurements ......................................................... 42 2.4.3. Murphey Candler Lake Shoreline Conditions ............................................................................................ 44 2.4.4. Overall Lake Health for Murphey Candler Lake ........................................................................................ 47 2.5. Limited Upland Conditions Assessment ........................................................................................................... 48 2.6. Summary of Findings ........................................................................................................................................ 50 Chapter 3. Watershed Improvement Projects and Programs ....................................................................................... 51 3.1. Watershed Improvement Goals ........................................................................................................................ 51 3.2 Process to Identify Projects ............................................................................................................................... 52 3.3. Recommended Watershed Improvement Projects ........................................................................................... 53 3.3.1. Stream Enhancement Projects .................................................................................................................. 53 3.3.2. BMP and BMP Retrofit Projects ................................................................................................................ 56 3.3.3. Murphey Candler Lake Recommended Projects ....................................................................................... 61 3.4. Future Conditions Model Results ...................................................................................................................... 66 3.4.1. Future Conditions Model Results .............................................................................................................. 66 3.5. Impervious Retrofit Assessment Areas ............................................................................................................. 67 3.6 Existing Watershed Programs and Recommendations ..................................................................................... 71 3.6.1. Enforcement of Existing Ordinances ......................................................................................................... 71 3.6.2. Public Education and Outreach and Public Involvement ........................................................................... 72 3.6.3. Infrastructure Inventory and Condition Assessment .................................................................................. 73 3.6.4. Inspection of Stormwater Management Facilities ...................................................................................... 73 3.6.5. City Maintenance Activities........................................................................................................................ 74 3.6.6. Regional Watershed Coordination ............................................................................................................. 74 3.6.7. Implementation Tracking ........................................................................................................................... 74 Chapter 4: Implementation Plan ................................................................................................................................... 75 4.1. Implementation Costs ....................................................................................................................................... 75 4.1.2. Recommended Project Cost Estimation Methodology and Assumptions .................................................. 75 4.1.2. Planning Level Costs for the Recommended Projects .............................................................................. 77 4.1.3. Recommended Retrofit Assessment Cost Estimation Methodology and Assumptions ............................. 78 4.2. Grant Funding and Financing ........................................................................................................................... 79 4.2.1. Grant Funding ..........................................................................................................................................
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