FLOOD11553

• County: Larimer
• Community: Larimer County and Incorporated Areas
• Basin: South Platte
• Title: FIS - Larimer County and Incorporated Areas - Vol 2
• Date: 6/17/2008
• Prepared For: Larimer County
• Prepared By: FEMA
• Floodplain - Doc Type: Current FEMA Regulatory Floodplain Information

TABLE OF CONTENTS

Volume 1

Page

1.0 INfRODUCTION .................................... .......................................................................... 1

1.1 Purpose of Study.. ................................. ........................................ ................. ................ 1

1.2 Authority and Acknowledgments .................................................................................. 1

1.3 Coordination........................................................................................ ............... ........... 5

2.0 AREA STUDIED............................................................................................................... 8

2.1 Scope of Study............................................................................................................... 8

2.2 Community Description................................................................................................. 9

2.3 Principal Flood Problems............................................................................................. 14

2.4 Flood Protection Measures........................................................................................... 17

3.0 ENGINEERING METHODS........................................................................................... 19

3.1 Hydrologic Analyses.................................................................................................... 19

3.2 Hydraulic Analyses...................................................................................................... 21

3 .3 Vertical Datum..................................................................................................... ........ 34

4.0 FLOOD PLAIN MANAGEMENT APPLICATIONS..................................................... 40

4.1 Flood Boundaries......................................................................................................... 40

4.2 Floodways .................................................................................................................... 42

5.0 INSURANCE APPLICATIONS....................................................................... ............. 135
6.0 FLOOD INSURANCE RATE MAP ..................................... ......................................... 136

7.0 OTHER STUDIES......................................................................................................... 138

8.0 LOCATION OF DATA ................................................................................................. 142

9.0 BIBLIOGRAPHY AND REFERENCES....................................................................... 142
10.0 REVISION DESCRIPTIONS...... ................................. .................... ...... ....148