FLOOD04421

• County: Arapahoe
• County: Douglas
• Community: Arapahoe, Douglas
• Stream Name: Piney Creek, Cottonwood Creek, Lone Tree,
• Basin: South Platte
• Title: Flood Hazard Area Delineation
• Date: 10/1/1975
• Prepared For: UDFCD
• Prepared By: Arapahoe, Douglas
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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TABLE OF CONTENTS

PAGE NO.

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PREFACE
Authorization
Purpose and Scope
Acknowledgements

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1
2

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LIST OF TABLES

PAGE

Table 1 - Drainage Basin Data 4

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STUDY AREA DESCRIPTION
Community Description
Study Reach Description
Drainage Basin Characteristics

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2
3
3

Table 2 - Historical Flood Discharges 4

Table 3 - Rainfall Data 7

HISTORICAL FLOODS

4

Table 4 - Drainage Basin Parameters 8

Table 5 - Flood Frequency and Discharge 8

Table 6 - Flood Plain and Floodway Reference Data,
Piney Creek Appendix

Table 7 - Flood Plain and Floodway Reference Data,
Cottonwood Creek Appendix

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FACTORS AFFECTING FLOOD HAZARD
Factors which Increase the Flood Hazard
Factors which Reduce the Flood Hazard

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5
6

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FLOOD RELATED STUDIES AND PERTINENT DATA

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HYDROLOGIC AND HYDRAULIC DETERMINATIONS
Hydrologic Analysis
Hydraulic Analysis

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9

Table 8 - Flood Plain and Floodway Reference Data,
Lone Tree Creek Appendix

Table 9 - Flood Plain and Floodway Reference Data,
Murphy Creek. Appendix

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FUTURE FLOODS
Flood Frequency and Discharge
Flooded Areas and Flood Damages
Piney Creek
Cottonwood Creek
Lone Tree Creek
Murphy Creek
Flood Plain and Floodway Data
Flood Velocities

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Figure 1 -
Figure 2 -
Figure 3 -
Figure 4 -
Figure 5 -

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SUMMARY

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APPENDIX

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DRAWINGS

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LIST OF FIGURES

(All Figures are located in the Appendix)

South Platte River at Columbine Country Club,
June, 1965.

South Platte River near West Mississippi Ave. in
Denver, June, 1965.

Flooding in Arapahoe County, June, 1965.

Flooding on a South Platte River Tributary, June, 1965.

100-Year Flood Hydrograph, Piney Creek and Murphy
Creek.

Figure 6 - 100-Year Flood Hydrograph, Cottonwood Creek and
Lone Tree Creek.
Figure 7 - Discharge Profiles, Piney Creek and Cottonwood Creek.
Figure 8 - Discharge Profiles, Murphy Creek and Lone Tree Creek.

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