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Watershed Stormwater Master Plans

Little Salt Creek


Little Salt Creek Watershed Master Plan

Table of Contents

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Cover Page, Cover Letter and Signature Page (415 K)
Table of Contents (29 K)
Executive Summary (577 K)
Section 1 Introduction and Purpose (388 K)
1.1 Introduction
1.2 Goals and Objectives
  • 1.2.1 Goals and Criteria
  • 1.2.2 Watershed Inventory
  • 1.2.3 Hydrology and Hydraulics
  • 1.2.4 Water Quality
  • 1.2.5 Geomorphic
  • 1.2.6 Soil Assessment
  • 1.2.7 Structures
  • 1.2.8 Public Involvement • Facilitation
  • 1.2.9 Capital Improvement Projects
  • 1.2.10 Potential Guidelines/Ordinances
  • 1.2.11 Technical Advisory Committee (TAC)
1.3 Public Participation Process
  • 1.3.1 Open House Events
  • 1.3.2 Citizen Advisory Committee
  • 1.3.3 Website and Newsletter
1.4 Technical Advisory Committee
Section 2 Data Collection and Development (423 K)
2.1 Watershed Inventory
2.2 Hydraulic Structure Field Survey
2.3 Base Mapping/Triangular Irregular Network
2.4 Geomorphic Investigation
  • 2.4.1 Geomorphic Background Investigation
  • 2.4.2 Geomorphic Field Investigation
  • 2.4.3 Supplemental Geomorphic Aerial Photo Analysis
2.5 Soil Assessment
  • 2.5.1 Methodology
  • 2.5.2 Dispersive Soils
  • 2.5.3 Saline Seeps
  • 2.5.4 Summary and Recommendations
2.6 Existing Projects and Conservation Easements
Section 3 Hydrologic Model Development (1.44 M)
3.1 Introduction
  • 3.1.1 Basin Description
3.2 Methodology
  • 3.2.1 Incorporation of Previous Little Salt Creek Model
  • 3.2.2 Basin Delineation
  • 3.2.3 Rainfall
  • 3.2.4 Runoff Volume Calculation
  • 3.2.5 Runoff Hydrographs (Lag Time)
  • 3.2.6 Routing
3.3 Model Verification
  • 3.3.1 Statistical Analysis of Stream Gage Data
3.4 Sensitivity Analysis
3.5 Model Calibration
  • 3.5.1 Historical Storm Event Calibration
3.6 Modeling Results
3.7 Future Land Use
  • 3.7.1 Calculation of Existing and Future Curve Numbers
  • 3.7.2 Calculation of Changes to Initial Storage
  • 3.7.3 Guidelines for Modifying the Hydrologic Model Initial Storage to Account for Future Land Use Changes
  • 3.7.4 Modifying the Hydrologic Model Lag Time to Account for Future Land Use Changes
Section 4 Hydraulic Model Development (1.08 M)
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
  • 4.2.4 Expansion and Contraction Coefficients
  • 4.2.5 Ineffective Flow Areas
  • 4.2.6 Boundary Conditions
4.3 Special Modeling Cases
  • 4.3.1 Split Flow Locations
  • 4.3.2 Multiple Structure Analysis
  • 4.3.3 Roadway Skew Analysis
4.4 Model Calibration
4.5 Floodway Determination
Section 5 Floodplain Management Tools (3.22 M)
5.1 Introduction
  • 5.1.1 Floodplain Delineation Process
  • 5.1.2 Study Floodplain and Floodway Maps
Section 6 Water Quality and Bio-Assessment (615 K)
6.1 Water Quality
  • 6.1.1 Water Quality Discussion
6.2 Stream Bio-Assessment
  • 6.2.1 Stream Bio-Assessment Results
6.3 Water Quality • Bio-Assessment Summary
6.4 Water Quality Future Land Use Hydrology
  • 6.4.1 Hydrology Modeling of Future Land Use
  • 6.4.2 Low Flow Analysis
Section 7 Drainage Criteria and Ordinance Review (92 K)
7.1 Introduction
7.2 Water Quality BMPs
  • 7.2.1 Integrated Detention Facility
  • 7.2.2 Alternative Site Design
7.3 Dispersive Soils
7.4 Conservation Culvert or Crossing
7.5 Adopt Revised Floodprone Area as Best Available Information
Section 8 Geomorphic Evaluation (898 K)
8.1 Fundamentals of Fluvial Geomorphology
  • 8.1.1 Major Models
  • 8.1.2 Temporal and Spatial Implications
  • 8.1.3 Sediment Transport
8.2 Little Salt Creek Evaluation
  • 8.2.1 Channel Geometry
  • 8.2.2 Boundary Material
  • 8.2.3 Hydraulics
  • 8.2.4 Sediment Transport Competency
8.3 Physical Stability of the Watershed
  • 8.3.1 Existing Channel Process
8.4 Methods of Management
  • 8.4.1 Watershed-Scale Stability
  • 8.4.2 Local Stability
  • 8.4.3 Conclusions
Section 9 Capital Improvement Projects (1.71 M)
9.1 Introduction
9.2 Capital Improvement Projects
  • 9.2.1 Problem Identification
  • 9.2.2 Evaluation Approach
  • 9.2.3 Stream Stability Projects
9.3 Other Improvement Recommendations
  • 9.3.1 Problem Identification
  • 9.3.2 Project Evaluation Approach
9.4 Prioritization
Section 10 Implementation (42 K)
10.1 Introduction
10.2 Implementation of Capital Improvements
10.3 Policy and Ordinances
10.4 Education Program
10.5 Project Funding
10.6 Coordination Efforts
10.7 Additional Studies • Future Master Planning Scoping
  • 10.7.1 Additional Studies Summary
  • 10.7.2 Phase II Scoping
Section 11 Glossary of Terms and References (54 K)
11.1 Glossary of Terms
11.2 References
Appendices
Appendix A - Digital Deliverables
Appendix B - Pubic Participation Materials (4.58 M)
Appendix C - Hydrologic Model Input Data and Results (647 K)
Appendix D - Hydraulic Model Input Data and Results (134 K)
Appendix E - Aerial Photograph Interpretation (725 K)
Appendix F - Hydraulic Structure Survey and Design Data (1.02 M)
Appendix G - Geomorphic Data Summary By Reach (83 K)
Appendix H - Soil Assessment Data (490 K)
Appendix I - Watershed Inventory Data Table (16 K)
Appendix J - Capital Improvement Project Prioritization Ranking Worksheets (163 K)
Appendix K - Capital Improvement Project Cost Worksheets (75 K)
Appendix L - Other Improvement Recommendations (580 K)
Appendix M - Stream Profiles (5.46 M)
Appendix N - Hydraulic Structure Performance Data (36 K)
Appendix O - Water Quality and Bio-Assessment Reports (1.54 M)
Appendix P - Groundwater Seep Survey Data (1.04 M)

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