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Stormwater Improvements Bond – November 5, 2024
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Comprehensive Watershed Master Plan
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Lynn Creek Watershed Master Plan
Lynn Creek Watershed Master Plan
May 2018
Documents in PDF format.
Download Complete Report
(92.7 M Zip PDF)
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Cover and Table of Contents
(614 K)
Executive Summary
(744 M)
Section 1 – Introduction and Purpose
(952 K)
1.1 Introduction
1.2 Watershed Characteristics
1.3 Goals and Objectives
1.4 Public Participation Process
1.4.1 Open House Events
1.4.2 Website and Newsletter
Section 2 – Inventory and Methodology
(285 K)
2.1 Watershed Inventory
2.2 Study Methodology
2.2.1 Geomorphic Evaluation
2.2.2 Hydrology and Hydraulics
2.2.3 Land Use and Development
2.2.4 Minimum Stream Corridor
2.2.5 Special Areas Consideration
Section 3 – Geomorphic Evaluation
(1.08 M)
3.1 Introduction
3.2 Methodology
3.3 Results
3.4 Stream Recommendations
Section 4 – Hydrology and Hydraulics
(1.76 M)
4.1 Introduction
4.2 Methodology
4.2.1 Existing Data Summary
4.2.2 Approximate Zone A Flood Zone Hazard Areas
4.2.2.1 Evaluation of Flood Hazard Area Boundary
4.2.2.2 Evaluation of Future Development Affecting the Flood Hazard Area Floodplain
4.2.3 Culvert Analysis
4.2.3.1 Flow Rates
4.2.3.2 Culvert Identification
4.2.3.3 HY-8 Analysis
4.2.3.4 Results
4.3 Hydrology and Hydraulics Recommendations
Section 5 – Land Use and Development
(1.69 M)
5.1 Introduction
5.2 Methodology
5.2.1 Existing Land Use Data
5.2.2 Future Land Use Data
5.2.3 Runoff Volume
5.3 Land Use and Development Recommendation
Section 6 – Minimum Stream Corridor
(2.52 M)
6.1 Introduction
6.2 Minimum Corridor Analysis
6.2.1 Existing Minimum Corridor Delineation Criteria
6.2.2 Minimum Corridor Analysis Methodology
6.2.3 Minimum Corridor Analysis Results
6.2.4 Other Minimum Corridor Criteria
6.3 Minimum Corridor Buffer Analysis
6.3.1 Existing Buffer Delineation Criteria
6.3.2 Minimum Corridor Buffer Analysis Methodology
6.3.3 Minimum Corridor Buffer Analysis Results
6.4 Minimum Corridor and Buffer Recommendations
Section 7 – Special Areas
(1.45 M)
7.1 Introduction
7.2 Methodology
7.3 Evaluation Results
7.4 Special Area Recommendations
Section 8 – Capital Improvement Projects
(6.71 M)
8.1 Introduction
8.2 Problem Identification
8.3 Evaluation Approach
8.3.1 Stream Erosion Evaluation
8.3.2 Special Areas Considerations
8.3.3 Capital Improvement Project Types
8.4 Capital Improvement Projects
8.4.1 Project LC-01: Grade Control Undermining Perched Adams St Culvert Outfall on Mainstem LCR005
8.4.2 Project LC-02: Grade Control Incision on Mainstem LCR005 and Side Tributary
8.4.3 Project LC-03: Grade Control Incision on Tributary LC005R005
8.4.4 Project LC-04: Roper Park Trail Relocation and Bank Stabilization on Mainstem LCR005
8.4.5 Project LC-05: Grade Control Scour at NW 1st St Culvert Outfall on Mainstem LCR010
8.4.6 Project LC-06: Grade Control Incising Drainage Ditch at NW 1st St Culvert on Mainstem LCR015
8.4.7 Project LC-07: Grade Control Incision on Tributary LC020R005
8.5 Prioritization
8.6 Other Improvement Recommendations
8.6.1 Project Other-01: Monitor Incision at Interstate 180 Crossing on Mainstem LCR005
8.6.2 Project Other-02: Monitor Bank Stabilization on Mainstem LCR005 at Roper Park Trail Bridge
8.6.3 Project Other-03: Monitor Erosion at Superior St Culvert Upstream East Wingwall on Mainstem LCR010
8.6.4 Project Private-01: Bank Stabilization and Grade Control at Pipe Outfall on Mainstem LCR005
8.6.5 Project Private-02: Rock Armor Outfall on Tributary LC010R005
8.6.6 Project Private-03: Grade Control Knickpoint on Tributary upstream of confluence with Mainstem LCR010
8.6.7 Project Private-04: Grade Control Incision on Tributary LC015R005
8.6.8 Project Private-05: Monitor Existing Grade Controls on Mainstem LCR015 and Confluence with Tributary LC020R005
8.6.9 Project Private-06: Basin Dam and Spillway Repair and Improvements on Tributary LC025R005
Section 9 – Implementation
(156 K)
9.1 Introduction
9.2 Capital Improvement Project Implementation
9.3 Education Program
9.4 Project Funding
9.5 Coordination Efforts
9.6 Additional Studies
Section 10 – Glossary of Terms and References
(296 K)
10.1 Glossary of Terms
10.2 References
Appendices
Appendix A - Digital Deliverables
(13 K)
Appendix B - Public Participation Materials (Summary Documents, Attendance Lists, Minutes, Watershed News)
(95.1 M)
Appendix C - Fundamentals of Fluvial Geomorphology
(1.14 M)
Appendix D - Channel Condition Scoring Matrix and Channel Condition Data
(1.25 M)
Appendix E - Dominant Process Indicators and Reach Summary Data Sheets
(502 K)
Appendix F - Hydrology and Hydraulics Data
(813 K K)
Appendix G - Land Use and Zoning Data
(533 K)
Appendix H - Stream Corridor Data
(4.23 M)
Appendix I - Capital Improvement Project Prioritization Ranking Worksheets
(527 K)
Appendix J - Capital Improvement Project Cost Worksheets
(500 K)
Figures
ES-1 Status of Watershed Master Plans
ES-2 Study Area Map
ES-3 CIP Locations
1-1 Status of Basin Plans Map
1-2 Study Area Map
1-3 Watershed Newsletter
1-4 Project Website
2-1 Study Reaches
3-1 Channel Evolution Stages
3-2 Fieldwork Limits
3-3 Study Reaches
3-4 Lynn Creek Photo
3-5 Channel Condition Scores
3-6 Stream Channel Dominant Process
4-1 Existing Floodplain and Floodway
4-2 FEMA Model Extents
4-3 Flood Hazard Area
4-4 Building Encroaching in Flood Hazard Area
4-5 Lynn Creek Outside the Flood Hazard Area
4-6 Flood Hazard Area Cross Section Locations Map
4-7 Buildings Encroaching 2 Feet above Flood Hazard Area
4-8 Buildings Encroaching 2 Feet above Flood Hazard Area
4-9 Watershed Culvert Analysis
5-1 Existing Land Use - 2017
5-2 Future Land Use - 2040
5-3 Hydrologic Soil Group
5-4 Existing Land Use Hydrologic Soil Overlay
5-5 Future Land Use Hydrologic Soil Overlay
6-1 GIS Stream Analysis
6-2 Test Site Locations
6-3 Test Site 1 with NHD Streams
6-4 Test Site 2 with NHD Streams
6-5 Test Site 3A and 3B with NHD Streams
6-6 Test Site 4 with NHD Streams
6-7 Test Site 5A and 5B with NHD Streams
6-8 City of Lincoln Minimum Corridor Illustration
6-9 Oak Creek Stream Test Site Locations
6-10 North Salt Creek Stream Test Site Locations
6-11 Oak Creek Contributing Drainage Area Locations
6-12 North Salt Creek Contributing Drainage Area Locations
6-13 Oak Creek Test Site 5 Buffer Delineation
7-1 Special Areas Map 1
7-2 Special Areas Map 2
7-3 Special Areas Map 3
8-1 Rock Grade Control Structure Detail
8-2 Bank Stabilization Structure Detail
8-3 Rock Armor and Scour Protection Detail (Rock Stilling Basin)
8-4 Watershed CIP Locations
8-5 Undermining Culvert Outfall
8-6 Undermining Culvert Outfall
8-7 Conceptual Layout of LC-01
8-8 Stream Incision
8-9 Conceptual Layout of LC-02
8-10 Stream Incision
8-11 Conceptual Layout of LC-03
8-12 Threatened Sidewalk
8-13 Conceptual Layout of LC-04
8-14 Scour at Culvert Outfall
8-15 Conceptual Layout of LC-05
8-16 Ditch Incision
8-17 Conceptual Layout of LC-06
8-18 Knickpoint at Culvert
8-19 Conceptual Layout of LC-07
8-20 Other & Private Projects
8-21 Perched Culvert Outfall
8-22 Conceptual Layout of Other-01
8-23 Stream Scour at the Bridge
8-24 Conceptual Layout of Other-02
8-25 Superior St Culvert
8-26 Conceptual Layout of Other-03
8-27 Scour at Pipe Outfall
8-28 Conceptual Layout of Private-01
8-29 Stream Incision
8-30 Residential Retaining Wall
8-31 Conceptual Layout of Private-02
8-32 Stream Incision
8-33 Conceptual Layout of Private-03
8-34 Early Stage Incision
8-35 Conceptual Layout of Private-04
8-36 Knickpoint in Stream
8-37 Conceptual Layout of Private-05
8-38 Failed Spillway
8-39 Conceptual Layout of Private-06
Tables
ES-1 Project Priority, Rank and Cost
1.1 Watershed Characteristics
3.1 Average Field Score Per Channel Condition Rating Category
3.2 Number of GOOD, FAIR and POOR Field Scores
4.1 Main Stem Peak Flow Rates and Depths
4.2 Evaluation of Flood Hazard Area Boundary Elevations
4.3 Culvert Overtopping Analysis
5.1 Existing Land Use Categories
5.2 Existing Land Use Areas
5.3 Existing and Future Land Use
5.4 Land Use Change – Existing to Future
5.5 Lookup table used to define the curve number for each land use/soil group combination
6.1 GIS Stream Analysis
6.2 Contributing Drainage Area at Location of 1 Foot Depth and Defined Bed and Bank
6.3 Test Site Buffer Widths at Multiple Contributing Drainage Areas
6.4 Recommended Buffer Width
8.1 Project Priority, Rank and Cost
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