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City of Lincoln
Watershed Stormwater Master Plans

Deadmans Run

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Table of Contents

Cover Page   (396 K)

Executive Summary   (897 M)

Section 1 - Introduction and Purpose   (559 K)

  • 1.1 Introduction
  • 1.2 Goals and Objectives
  • 1.3 Public Participation Process
    • 1.3.1 Open House Events
    • 1.3.2 Citizen Advisory Committee
    • 1.3.3 Information Sessions
    • 1.3.4 Newsletter and Website

Section 2 - Data Collection and Development   (169 K)

  • 2.1 Watershed Inventory
  • 2.2 Drainage Structure Field Survey
  • 2.3 Base Mapping
  • 2.4 Water Quality Evaluation
  • 2.5 Geomorphic Investigation

Section 3 - Hydrologic Model Development   (932 K)

  • 3.1 Introduction
  • 3.2 Hydrology Methodology
    • 3.2.1 Subarea Delineation
    • 3.2.2 Rainfall
    • 3.2.3 Runoff Volume
    • 3.2.4 Runoff Hydrographs (Lag Time)
    • 3.2.5 Routing (Muskingum-Cunge)
    • 3.2.6 Storage
    • 3.2.7 Deadmans Run West Tributary
    • 3.2.8 Flow Diversions
  • 3.3 Model Calibration and Verification
  • 3.4 Model Results

Section 4 - Hydraulic Model Development   (63 K)

  • 4.1 Introduction
  • 4.2 HEC-RAS Model Development
    • 4.2.1 Stream Network, Cross Sections, and Reach Lengths
    • 4.2.2 Manning’s n-Values
    • 4.2.3 Roadway Crossings and Dams
    • 4.2.4 Expansion and Contraction Coefficients
    • 4.2.5 Boundary Conditions
    • 4.2.6 Ineffective Flow Areas
    • 4.2.7 Channel Bank Stations
  • 4.3 Modeling Deadmans Run West Tributary
  • 4.4 Steady Flow Water Surface Profiles
  • 4.5 Floodway Determination
  • 4.6 Model Calibration and Verification
  • 4.7 Quality Control
  • 4.8 HEC-RAS Product

Section 5 - Floodplain Management Tools   (1.02 M)

  • 5.1 Floodprone Areas
    • 5.1.1 Flood Insurance Certificates
    • 5.1.2 Floodplain Delineation Process
    • 5.1.3 Study Floodplain and Floodway Maps

Section 6 - Water Quality   (325 K)

  • 6.1 Introduction
  • 6.2 Regulatory Compliance
    • 6.2.1 Stormwater Regulations
    • 6.2.2 Surface Water Regulations
  • 6.3 Evaluation Approach
  • 6.4 Previous Water Quality Studies
    • 6.4.1 Stormwater Quality Evaluation of Livestock Runoff
    • 6.4.2 Dry Weather Stormwater Monitoring
  • 6.5 Wet Weather Water Quality Assessment
    • 6.5.1 Water Quality Sampling Program
    • 6.5.2 Water Quality Sampling Results
  • 6.6 Water Quality Recommendations
    • 6.6.1 Nonstructural BMPs
    • 6.6.2 Structural BMPs
    • 6.6.3 Private Development Demonstration Projects
    • 6.6.4 Additional Studies

Section 7 - Fluvial Geomorphic Evaluation   (923 K)

  • 7.1 Introduction
  • 7.2 Geomorphic Field Reconnaissance
  • 7.3 Evaluation Results
      7.3.1 Historical Background 7.3.2 Stream Stage Classification 7.3.3 Summary Discussion
  • 7.4 Stream Improvements

Section 8 - Capital Improvement Projects   (3.37 M)

  • 8.1 Introduction
  • 8.2 Problem Identification
  • 8.3 Evaluation Approach
    • 8.3.1 Flooding Evaluation
    • 8.3.2 Stream Erosion/Water Quality Evaluation
  • 8.4 Recommended Improvement Projects
    • 8.4.1 Stormwater Conveyance Projects
    • 8.4.2 Stormwater Detention Projects
    • 8.4.3 Local Flood Control
    • 8.4.4 Water Quality Projects
  • 8.5 Watershed Solution
  • 8.6 Prioritization
  • 8.7 Summary
  • 8.8 Other Projects Evaluated
    • 8.8.1 Other Stormwater Conveyance Projects
    • 8.8.2 Other Stormwater Detention Projects
    • 8.8.3 Other Water Quality Projects

Section 9 - Benefit-Cost Analysis   (59 K)

  • 9.1 Introduction
  • 9.2 Benefit-Cost Analysis Approach
  • 9.3 Benefit-Cost Ratio Calculation Process
  • 9.4 Conclusions

Section 10 - Implementation   (47 K)

  • 10.1 Capital Improvement Project Implementation
    • 10.1.1 Watershed Solution
    • 10.1.2 Local Flood Control
    • 10.1.3 Water Quality Projects
  • 10.2 Maintenance Agreements
  • 10.3 Coordination Efforts
  • 10.4 Project Funding
  • 10.5 Education Program
  • 10.6 Additional Studies

Section 11 - Glossary of Terms and References   (55 K)

  • 11.1 Glossary of Terms
  • 11.2 References

Appendices

Tables

  • 2-1 Drainage Structure Survey Data
  • 3-1 Rainfall Duration Depths
  • 3-2 Existing Land Use Percentages
  • 3-3 Curve Numbers for Deadmans Run Watershed
  • 3-4 Lancaster County Hydrologic Soil Groups
  • 3-5 Sheet Flow and Shallow Concentrated Flow Values
  • 3-6 100-Year Flow Comparisons
  • 3-7 Drainage Area Comparisons
  • 3-8 HEC-HMS Modeling Results
  • 4-1 HEC-RAS Parameters Development
  • 4-2 Land Surface Characteristics and Associated Manning’s n-Values
  • 4-3 Channel Descriptions and Associated Manning’s n-Values
  • 4-4 Expansion and Contraction Coefficients
  • 6-1 Structural BMP CIP Projects
  • 8-1 Stream Crossing Overtopping Flood Depths
  • 8-2 Bridge Ratings and Status
  • 8-3 Deadmans Run Priority Ranking Results
  • 8-4 Recommended Improvement Project Costs
  • 9-1 Categories of Avoided Damages
  • 9-2 Benefit-Cost Ratio Procedures
  • 9-3 Total Physical Damages Before Projects
  • 9-4 Total Physical Damages After Projects

Figures

  • 1-1 Deadmans Run Watershed Area Map
  • 1-2 City of Lincoln Comprehensive Watershed Management Plan
  • 2-1 Water Quality and Geomorphic Assessment Locations
  • 3-1 Deadmans Run Existing Conditions Land Use
  • 3-2 Deadmans Run Hydrologic Soil Groups
  • 3-3 Stormwater Detention Facilities
  • 3-4 Deadmans Run West Tributary
  • 5-1 Floodplain Map Tiles
  • 5-2 Tile 1 Floodplain Map
  • 5-3 Tile 2 Floodplain Map
  • 5-4 Depth of 100-Year Storm
  • 6-1 Water Quality Sampling Locations
  • 6-2 Continuous Deflection Plan View
  • 7-1 Geomorphic Evaluation Stream Segments
  • 7-2 Segments 1 and 2 - Historical Photographs
  • 7-3 Segment 3 - Historical Photographs
  • 7-4 Channel Evolution Model (Simon 1989)
  • 7-5 Segment 3 – Existing Outfalls
  • 7-6 Deadmans Run Knickpoints.
  • 8-1 Master Plan Existing Conditions 100-Year Floodplain
  • 8-2 Conceptual Level Improvement Projects
  • 8-3 Project 1, Location 1 Channel Improvements
  • 8-4 Project 1, Location 1 Typical Channel Cross Section
  • 8-5 Project 1, Location 2 Channel Improvements
  • 8-6 Project 1, Location 3 Channel Improvements
  • 8-7 Project 1, Location 3 Typical Channel Cross Section
  • 8-8 Project 2, Improvement Locations
  • 8-9 Project 2, Location 1 Typical Channel Cross Section
  • 8-10 Project 2, Location 2 Typical Channel Cross Section
  • 8-11 Project 3 Channel Improvements
  • 8-12 Project 3 Typical Channel Cross Section
  • 8-13 Project 4 Channel Improvements
  • 8-14 Project 4 Typical Channel Cross Section
  • 8-15 Project 5 Design Components
  • 8-16 Project 6 Design Components
  • 8-17 Project 7 Construction Limits
  • 8-18 Recommended Water Quality Project Locations
  • 8-19 Project 8 Pond Retrofits
  • 8-20 Bethany Park Recommended Water Quality Feature
  • 8-21 Russwood Basin Retrofits
  • 8-22 Project 11 Water Quality Features
  • 8-23 Project 12 Location of Hydrodynamic Separator
  • 8-24 Project 13 Location of Stream Stabilization Measures
  • 8-25 100-Year Floodplain Comparison
  • 8-26 Other Projects Evaluated
  • 9-1 FEMA Building Depth-Damage Curves
  • 9-2 FEMA Contents Depth-Damage Curves
  • 9-3 Street Flooding Depth-Damage Curves

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