Stevens Creek Watershed Master Plan
March 2005
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Cover and Table of Contents (436 K)
Executive Summary (1.2 M)
Section 3 – Hydrologic Model Development (1.42 M)
Section 4 – Hydraulic Model Development (221 K)
Section 6 – Water Quality and Stream Stability (910 K)
Section 7 – Drainage Criteria Manual Review (546 K)
Section 8 – Geomorphic Evaluation (852 K)
Section 10 – Implementation (323 K)
Appendices
- Appendix A - Digital Deliverables
- Appendix B - Public Participation Materials (Summary Documents, Attendance Lists, Minutes, Watershed News)
- Appendix C - Hydrologic Model Input Data and Results
- Appendix D - Hydraulic Model Input Data and Results
- Appendix E - Stream Profiles
- Appendix F - Biological Assessment Report
- Appendix G - Example WQCV Calculations
- Appendix H - Example Maintenance Documents
- Appendix I - Stream Reach Descriptions
- Appendix J - Drainage Structure Design Data
- Appendix K - Opinion of Probable Construction Costs
Tables
- ES-1 Capital Improvement Project List
- 2-1 Project Information Notebooks - Summary of Data
- 2-2 Geomorphic Field
- 3-1 Rainfall-Duration Depths
- 3-2 Existing Land Use Percentages
- 3-3 Curve Numbers for Stevens Creek Watershed Study
- 3-4 2025 Land Use Percentages
- 3-5 Breakdown of Surrogate Future Land Use
- 3-6 Lancaster County Hydrologic Soil Groups
- 3-7 Sheet Flow and Shallow Concentrated Flow Values
- 3-8 100-Year Flow
- 3-9 Peak Flow Modeling Results
- 4-1 HEC-RAS Model Data Sets
- 4-2 Land Surface Characteristics and Associated Manning's n-Values1
- 4-3 Channel Descriptions and Associated Manning's n-Values1
- 4-4 Expansion and Contraction Coefficients1
- 5-1 Properties Offered a Flood Certificate
- 5-2 Stevens Creek Confluence Level Pool Elevations (NAVD 88)
- 6-1 Summary of Historical Rainfall Data - USGS Havelock Gauge
- 6-2 Subarea Land Surface Characteristics
- 6-3 Peak Flow Rates
- 6-4 Cumulative Excess Shear Stress
- 6-5 Method 1: Conceptual Cost Estimate
- 6-6 Method 2: Conceptual Cost Estimate
- 6-7 Method 1 - Regional Structural BMPs
- 6-8 Method 2 - Site-Specific Structural BMPs
- 7-1 Design Criteria for Stormwater Basins
- 7-2 Comparison of WQCV Calculation Approaches
- 7-3 Suggested Maintenance Activities for Extended Dry Detention Basins
- 7-4 Suggested Maintenance Activities for Extended Wet Detention Basins
- 7-5 Suggested Maintenance Activities for Constructed Wetlands
- 7-6 Suggested Maintenance Activities for Bioretention Filters
- 7-7 Suggested Maintenance Activities for Vegetated Swales
- 7-8 Suggested Maintenance Activities for Open Channels
- 9-1 Capital Improvement Project List
- 9-2 Capital Improvement Project Cost Estimate
Figures
- ES-1 Comprehensive Watershed Master Plan – Status of Basin Plans
- ES-2 Floodplain Map
- ES-3 CIP Projects
- ES-4 Integrated Detention Pond and Structural BMPs
- ES-5 Watershed Planning Map
- 1-1 Watershed Location
- 1-2 Project Organizational Chart
- 1-3 Watershed Demographics
- 1-4 Questionnaire Responses
- 2-1 Drainage Structure Locations
- 2-2 LiDAR Data/Thalwag Survey Locations
- 3-1 Subarea Boundaries
- 3-2 Recurrence Interval Versus Rainfall Depth
- 3-3 Existing Land Use Plan
- 3-4 Future Land Use Plan
- 3-5 Hydrologic Soil Groups
- 3-6 Modeled Storage and Rain Gauge Locations
- 3-7 Flow Diversion Locations
- 3-8 Stevens Creek – Havelock Street 9-8-89 Calibration Event
- 3-9 Flow Comparison Locations
- 4-1 Stream Reach Locations
- 5-1 Floodplain Map
- 5-2 Floodplain Map Tile No. 1
- 5-3 Floodplain Map Tile No. 2
- 5-4 Floodplain Map Tile No. 3
- 5-5 Floodplain Map Tile No. 4
- 5-6 Floodplain Map Tile No. 5
- 5-7 Floodplain Map Tile No. 6
- 5-8 Floodplain Map Tile No. 7
- 5-9 Floodplain Map Tile No. 8
- 5-10 Floodplain Map Tile No. 9
- 5-11 Floodplain Map Tile No. 10
- 5-12 Floodplain Map Tile No. 11
- 5-13 Floodplain Map Tile No. 12
- 5-14 Floodplain Map Tile No. 13
- 5-15 Floodplain Map Tile No. 14
- 5-16 Floodplain Map Tile No. 15
- 6-1 Hydrologic Responses to Development (Roesner et al. 2001)
- 6-2 BMP Treatment Train
- 6-3 Bioassessment Sample Points
- 6-4 Prototype Watershed
- 6-5 Reach 1 - Flow Frequency Curve
- 6-6 Reach 2 - Flow Frequency Curve
- 6-7 Reach 1 - Flow Duration Frequency Curves
- 6-8 Reach 2 - Flow Duration Frequency Curves
- 6-9 Reach 1 - Shear Stress Duration Curves
- 6-10 Reach 2 - Shear Stress Duration Curves
- 6-11 Method 1 - Regional Structural BMP Locations
- 6-12 Integrated Detention Pond and Structural BMP
- 7-1 Schematic of an Extended Dry Detention Basin
- 7-2 Outlet Structure Details Extended Dry Detention Basin
- 7-3 Schematic of an Extended Wet Detention Basin
- 7-4 Outlet Structure Details Extended Wet Detention Basin
- 7-5 Lincoln, Nebraska Average Annual Rainfall Volume Capture
- 7-6 Example WQCVs Drawdown
- 7-7 Design Alternative No. 1 - Incorporating Structural BMPs and Detention Basins
- 7-8 Design Alternative No. 2 - Incorporating Structural BMPs and Detention Basins
- 7-9 Traditional Culvert
- 7-10 Modified Culvert
- 8-1 Lane's Stable Channel Balance
- 8-2 Channel Evolution Model (Simon 1989)
- 8-3 Meander Formation and Migration
- 8-4 Meander Geometry
- 8-5 Stages of a River System
- 8-6 General Channel Profile of a Watershed
- 8-7 Effect of a Dam Resetting the Stream Formation Sequence
- 8-8 Effect of Stream Crossings Resetting the Stream Formation Sequences
- 8-9 Hydrograph and Sedigraph
- 8-10 Width versus Radius
- 8-11 Width versus Meander Wavelength
- 8-12 Radius versus Width by Location
- 8-13 Wavelength versus Width by Location
- 8-14 Channel Bed Profile
- 8-15 Critical Bank Height and Angle for Saturated Conditions, Slopes <5 Feet
- 8-16 Critical Bank Height and Angle for Slopes >5 Feet
- 8-17 Main Stem Longitudinal Profile
- 8-18 Occurrence of Knickpoints in Relation to Shear Stress
- 8-19 Knickpoint Frequency along Incising and Widening Reach
- 8-20 Existing Channel Process
- 8-21 Newbury-Style Grade Control Structures
- 9-1 Problem Areas
- 9-2 Stream Reach Locations
- 9-3 Stevens Creek Intervention #1
- 9-4 Stevens Creek Intervention #2
- 9-5 Stevens Creek Intervention #3
- 9-6 Stevens Creek Intervention #4
- 9-7 Stevens Creek Intervention #5
- 9-8 Stevens Creek Intervention #6
- 9-9 Stevens Creek Intervention #7
- 9-10 Stevens Creek Intervention #8
- 9-11 Stevens Creek Intervention #9
- 9-12 Stevens Creek Intervention #10
- 9-13 Stevens Creek Intervention #11
- 9-14 Stevens Creek Intervention #12
- 9-15 Stevens Creek Intervention #13
- 9-16 Stevens Creek Intervention #14
- 9-17 Stevens Creek Intervention #15
- 9-18 Stevens Creek Intervention #16
- 9-19 Stevens Creek Intervention #17
- 9-20 Stevens Creek Intervention #18
- 9-21 Stevens Creek Intervention #19
- 9-22 Stevens Creek Intervention #20
- 9-23 Stevens Creek Intervention #21
- 9-24 Stevens Creek Intervention #22
- 9-25 Stevens Creek Intervention #23
- 9-26 Stevens Creek Intervention #24
- 9-27 Stevens Creek Intervention #25
- 9-28 Stevens Creek Intervention #26
- 9-29 CIP Projects
- 10-1 Watershed Planning Map