FLOOD10350

• Designation Number: 578
• County: Delta
• Community: Orchard City
• Stream Name: Surface Creek, Cedar Run and Tongue Creek
• Title: Floodplain Information Report: City of Orchard City, CO
• Date: 9/1/2004
• Prepared For: Orchard City and CWCB
• Prepared By: Love and Associates
• Floodplain - Doc Type: Floodplain Report/Masterplan

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TABLE OF CONTENTS

PREFACE .... ... ............. ... ............... ... ........ ................. .................. .... ...... ........ .... .... .... ..... ... 1

TABLE OF CONTENTS. ............. .......... ............ ............... .............................. ...... ........... 2

INTRODUCTION.....................................................:....................................................... 3

Purpose and Scope ...... ..... ............ .............. ............... ...................................... .............. 3

Au thorization................................................................................................................. 3

STUDY AREA DESCRIPTION .................... ........................... .............................. ......... 4

Community Description...... ........................... ....... .............. ........................ ........ ......... 4

Watershed Description .......... ..... ......... ............. ..... ..... ... ................... ... ...... .... ..... .... ...... 4

Flooding Problems and Flooding History................................................................... 7

Previous Studies ............................................. .............. ........................... ...................... 7

Community Response to the CWCB Designation and Approval Process ...............7

ENGINEERING METHODS.............................. ....... ............ ...................... ........ ......... 15

Hydrologic Analysis.................................................................................................... 15

Hydraulic Analysis...................................................................................................... 17

Floodplain Mapping.......... .......... ......... ..... .... ...................... ....... ....... .......................... 17

FLOODPLAIN MANAGEMENT.. ............ ... ......... .................. ........ ................. ............ 22
Local Ordinance Requirements.. .......... .............. ........................ ........ ........ ........ ....... 22

Flood Insurance.................. ..... ............................... .......... ............... ................... ......... 22

Floodplain Management Alternatives....... ................... ......... .................. .................. 22

REFERENCES ....... .... ... ........ ........ ..... ........ ............... ..... ..... ....... ........ .... ..... ..... ... ......... ... 24

Figures

Figure 1 - Vicinity Map
Figure 2 - Catchment Areas and Design Points
Figure 3A-3F - Flood Boundary and Floodway, and Flood Insurance Rate Maps
Figure 4A-4D - 100- Year Floodplain Delineation

Appendix

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