FLOOD10336 ‎(2)‎

• County: Adams
• Community: Brighton, Commerce City and Thornton
• Stream Name: South Platte River
• Title: Flood Hazard Area Delineation, South Platte River, Adams County
• Date: 4/1/2005
• Prepared For: UDFCD; Adams County; Brighton, Commerce City, Thornton, Metro Wastewater
• Prepared By: CDM
• Floodplain - Doc Type: Floodplain Report/Masterplan

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4.3

4.2.1 1977 and 1985 FHAD Models
4.2.2 Master Plan Model.................
FHAD Model Preparation....................
4.3.1 Migration from HEC-2 to HEC-RAS
4.3.2 Incorporation of Recent Channel Modifications
4.3.3 Developing the Split Flow Model........................
4.3.4 Modeling Divided Flow and Embankment Analysis
4.3.5 Bridge Geometry

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Section 4 Hydraulic

Introduction
Prior Studies

4.1
4.2

4-1
4-1
4-1
4-1
4-2
4-3
4-3
4-3
4-3
4-4

3.3
3.4

Analysis

500- Year Flows

Summary

3.2.1
3.2.2
3.2.3

Hydrologic
Results

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Modeling

Flood Hydrology
Prior Studies

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3.2

Watershed Description
3.1.1 Watershed Inflows
3.1.2 South Platte River Streamflows

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Section 3 Hydrology
3.1

3-1
3-1
3-1
3-2
3-2
3-2
3-4
3-4
3-5

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2.1
2.2
2.3
2.4
2.5

Geology
Surface Water

Resources
Flooding History

Geography and Climate.
Land Use

2-1
2-1
2-1
2-1
2-2

Appendix A Discharge Profiles
Appendix B Floodplain and Floodway Data
Appendix C Floodplain Drawings and Profiles
Appendix 0 Bridge Geometry

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Section 2 Study Area Description

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Section 1 Introduction
1.1
1.2
1.3
1.4
1.5
1.6

Authorization
Purpose ..........
Scope of Work
Mapping..........
Background Information
Acknowledgments

1-1
1-1
1-1
1-1
1-1
1-1

Appendices

Section 5 References

Mapping....
Floodplain Comparisons

4.3.6
Results
4.4.1
4.4.2
4.4.3
4.4.4
4.4.5

Flood Characteristics
Bridges ....
Floodway

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Cover Letter

4.4

4-4
4-5
4-5
4-5
4-5
4-5
4-5

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Contents

Floodway Methodology

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4/8/05