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Stevens Creek Watershed Master Plan
Stevens Creek Watershed Master Plan
March 2005
Documents in PDF format.
Download Complete Report
(10.5 M PDF)
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Cover and Table of Contents
(436 K)
Executive Summary
(1.2 M)
Section 1 - Introduction and Purpose
(560 K)
1.1 Introduction
1.2 Goals and Objectives
1.3 Public Participation Process
1.3.1 Questionnaire Survey
1.3.2 Open House Events
1.3.3 Citizen Advisory Committee
1.3.4 Property Owner Meetings and Stakeholder Sessions
1.3.5 Website and Newsletter
1.3.6 Watershed Bus Tours
Section 2 – Data Collection and Development
(508 K)
2.1 Watershed Inventory
2.2 Drainage Structure Field Survey
2.3 Base Mapping/Triangular Irregular Network
2.4 Longitudinal Profile Survey
2.5 Geomorphic Investigation
2.5.1 Geomorphic Background Investigation
2.5.2 Geomorphic Field Investigation
Section 3 – Hydrologic Model Development
(1.42 M)
3.1 Introduction
3.2 Hydrology Methodology
3.2.1 Subarea Delineation
3.2.2 Rainfall
3.2.3 Runoff Volume (SCS CN)
3.2.4 Runoff Hydrographs (Lag Time)
3.2.5 Routing (Muskingum-Cunge)
3.2.6 Watershed Stora
3.2.7 Flow Diversions
3.3 Model Calibration
3.3.1 Historical Storm Event Calibration
3.3.2 Peak Flow Verification
3.4 Stream Gauge Statistical Analysis
3.5 Modeling Results
Section 4 – Hydraulic Model Development
(221 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 Special Modeling Cases
4.3.1 Stevens Creek Overflow Channel
4.3.2 Split Flow Occurrences
4.4 Floodway Determination
4.5 Model Verification
Section 5 – Floodplain Management Tools
(2.4 M)
5.1 Flood Prone Areas
5.1.1 Flood Insurance Certificates
5.1.2 Floodplain Delineation Process
5.1.3 Study Floodplain and Floodway Maps
5.2 Floodplain Management Strategy
Section 6 – Water Quality and Stream Stability
(910 K)
6.1 Background
6.2 Regulatory Compliance
6.3 Evaluation Approach
6.4 Biological Assessment
6.4.1 Methodology
6.4.2 Summary and Recommendations
6.5 Stream Sustainability Analysis
6.5.1 Methodology
6.5.2 Watershed Management Scenarios
6.5.3 Modeling Results
6.6 Evaluation Results
6.6.1 Major Conclusions
6.6.2 Recommendations
6.7 Implementation Methods
6.7.1 Method 1 – Regional Structural BMPs
6.7.2 Method 2 – Site-Specific Structural BMPs
6.7.3 Comparison Evaluation
6.7.4 Recommendations
Section 7 – Drainage Criteria Manual Review
(546 K)
7.1 Background
7.2 Integrating Stormwater Detention with Structural BMPs
7.2.1 Extended Dry Detention Basin
7.2.2 Extended Wet Detention Basin
7.2.3 Water Quality Control Volume
7.3 Alternative Design Approaches
7.4 Facility Ownership and Maintenance
7.4.1 Maintenance Requirements
7.4.2 Maintenance Agreement
7.4.3 Maintenance Plan
7.5 Conservation Culvert Design
Section 8 – Geomorphic Evaluation
(852 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 Stevens 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
8.3.2 Erosion Hazard
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
(3.02 M)
9.1 Problem Identification
9.1.1 Drainage Infrastructure
9.1.2 Habitable Buildings
9.1.3 Natural Streams
9.1.4 Summary
9.2 Recommended Improvements
9.2.1 Methodology
9.2.2 Stream Interventions
9.3 Capital Improvement Projects
9.4 Other Areas of Concern
Section 10 – Implementation
(323 K)
10.1 Setting Priorities
10.1.1 Evaluation Criteria
10.1.2 Other Considerations
10.2 Implementation Issues
10.2.1 Maintenance/Funding
10.2.2 Policy and Ordinances
10.2.3 Education Program
10.2.4 Coordination Efforts
10.3 Opportunity Areas
Section 11 – Digital Deliverables
(34 K)
11.1 Electronic Files
11.2 GIS Shapefiles
Section 12 - Glossary of Terms and References
(93 K)
12.1 Glossary of Terms
12.2 References
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-Values
1
4-3 Channel Descriptions and Associated Manning's n-Values
1
4-4 Expansion and Contraction Coefficients
1
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
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