FLOOD09330

• County: La Plata
• Community: La Plata County and Unincorporated Areas
• Basin: San Juan/Dolores
• Title: FIS - La Plata County and Unincorporated Areas
• Date: 5/21/2001
• Prepared For: La Plata County
• Prepared By: FEMA
• Floodplain - Doc Type: Current FEMA Regulatory Floodplain Information

TABLE OF CONTENTS

Page

1.0 INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

1.1 Purpose of Study....................... . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.2 Coordination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.3 Authority and Acknowledgments....... ......... ... ...... ... ...... ..1

2.0 AREA STUDIED..... . .. . ... ... ...... .... .... .. .. ... ... ... .... ..... .. . .....2

2.1 Scope of Study................................................... 2
2.2 Corrununity Description............................................2
2.3 Principal Flood Problems......................................... 5
2.4 Flood Protection Measures.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

3.0 ENGINEERING METHODS.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

3.1 Hydrologic Analyses.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
3.2 Hydraulic Analyses......... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

4.0 FLOOD PLAIN MANAGEMENT APPLICATIONS........... ._. _... ...... .... .......12

4.1 Flood Boundaries.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
t;.2 Floodways. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

5.0 INSURANCE APPLICATION............ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

5.1 Reach Determinations............................................ 30
5.2 Flood Hazard Factors............................................ 30
5.3 Flood Insurance Zones........................................... 33
5.4 Flood Insurance Rate Map Description............................34

6.0 OTHER STUDIES......................................................... 34

7.0 LOCATION OF DATA...................................................... 34

8.0 BIBLIOGRAPHY AND REFERENCES...... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

9.0 REVISION DESCRIPTIONS............ ... ...... ............ ......... .......37

9.1 First Revision................................................. .37
9.2 Second Revision... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38