Floodplain Information Report Volume 4 Colorado River Mainstem from Rifle to the Utah Stateline

• Basin: Colorado Mainstem
• Title: Floodplain Information Report Volume 4 Colorado River Mainstem from Rifle to the Utah Stateline
• Date: 3/1/1995
• Prepared For: The Recovery Implementaiton Program for Endangered Fish Species in the Upper Colorado River Basin
• Prepared By: CWCB
• Floodplain - Doc Type: Floodplain Report/Masterplan

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TABLE OF CONTENTS
Preface
1.0 INTRODUCTION ....... ............................... 1
1.1
Purpose ......... ............................... 1
1.2
Acknowledgements ... ............................... 1
1.3
Related Flood Studies . ............................... 1
2.0 STUDY AREA ......... ............................... 3
2.1
Location ......... ............................... 3
2.2
Study Reach ....... ............................... 3
2.3
Basin Characteristics .. ............................... 5
2.4
Summary of Drainage Areas ............................ 5
2.5
Flood Characteristics . ............................... 7
3.0 HYDROLOGIC ANALYSIS . ............................... 10
3.1 Existing Data ...... ............................... 10
3.2 Generating New Information ............................ 10
3.3 Equation Selection Process ............................. 11
3.4 Hydrologic Findings .. ............................... 11
4.0 HYDRAULIC ANALYSIS .. ...............................
14
4.1
Base Mapping ...... ...............................
14
4.2
Stream Reaches ..... ...............................
14
4.3
Field Surveys and Cross - Section Preparation ..................
17
4.4
Computing Flood Depths ..............................
18
4.5
Delineating Flood Boundaries ...........................
19
5.0 INTERPRETATION OF THIS REPORT .........................
22
5.1
Hydrologic Findings .. ...............................
22
5.2
Hydraulic Findings ... ...............................
22
5.3
Floodplain Delineations ...............................
22
6.0 REFERENCES ......... ............................... 23
LIST OF TABLES
TABLE
PAGE
1 Stream Gage Data
3
2 Drainage Area Summary
7
3 Flow Summary
12
4 Reach Classifications
15
5 Cross - Section Summary
18
6 Depth of Flooding Summary
20
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