FLOOD03593

• County: Garfield
• Community: Glenwood Springs
• Basin: Statewide
• Title: Debris-flow Hazard Analysis and Mitigation An Example from Glenwood Springs
• Date: 1/1/1977
• Prepared For: State of Colorado
• Prepared By: USGS
• Floodplain - Doc Type: Educational/Technical/Reference Information

TABLE OF CONTENTS

LETTER OF TRANSMITTAL............"................................ ii

LIST OF FIGURES................................................... vi

SUMMARY.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . .

CHAPTER I:
CHAPTER II:

INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . , . . . . , . . . . . . . . . . . . .

DEBRIS-FLOW DRAINAGE BASINS..........................

Location of basins.............................................

General characteristics of debris-flow basins................

Relative susceptibilities of basins to debris flows..........

Summary statement about the debris-flow basins."............. 12

CHAPTER Ill: DEBRIS-FLOW DyNAMICS.................."............. 14

Formation and mobilization of the debris flows............... 14

Flow of debris...... , .. ..' ... ... . ." .. . .. .. , ... ..... . .. .. . . . .. 20

CHAPTER IV: DEBRIS-FLOW PROBABILITy.............................. 29
Probability relationships.................................... 29

The July 24, 1977, rainstorm......".......................... 30

Rainfall and debris-flow probability......................... 31

CHAPTER V: PROTECTION OF BUILDINGS AND PROPERTy.................. 32

Introduction........".....................".......................... 32

General considerations....................".................. 33

Direct protection against impact......................... .... 34

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