FLOOD04285

• Designation Number: 270
• County: Adams
• Community: Westminster
• Stream Name: Big Dry Creek & Tributaries
• Basin: South Platte
• Title: Flood Hazard Area Delineation - Big Dry Creek & Tributaries
• Date: 11/1/1986
• Designation Date: 12/1/1987
• Floodplain - Doc Type: Floodplain Report/Masterplan

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INTRODUCTION
Authorization and Acknowledgements
h~HeclSW~
Study Limits

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BASIN DESCRIPTIONS

FLOOD HISTORY

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FLOOD MITIGATION MEASURES

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HYDROLOGIC ANALYSES
Precipitation
Loss Rates and Depression Storage
Percent Impervious Values
Unit Hydrograph Coefficients
Routings
Computed Results

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HYDRAULIC ANALYSES

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FLOODPLAIN AND FLOODWAY DATA

FLOODPLAIN DELINEATIONS

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SUMMARY

BIBLIOGRAPHY AND REFERENCES

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LIST OF TABLES
Table 1 - Study Reach Descriptions
Table 2 - Point Rainfall Depths
Table 3 - lOO-Year Point Rainfall Distribution Westminster
Area
Table 4 - Loss Rate Data
Table 5 - Percent Impervious Values
Table 6 - Basin Parameters (Greiner Engineering)
Table 7 - Basin Parameters (Muller Engineering)
Tables 8-23 - Floodplain and Floodway Reference Data

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TABLE OF CONTENTS

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LIST OF FIGURES - DISCHARGE PROBABILITY PROFILES
Figure 1 - Big Dry Creek 1-25 to Sheridan Blvd.
Figure 2 - Big Dry Creek Sheridan Blvd. to Standley Lake
Figure 3 - Tanglewood Creek
Figure 4 - North Cotton Creek
Figure 5 - Middle Cotton Creek
Figure 6 - South Cotton Creek
Figure 7 - Airport Creek
Figure 8 - North Branch Airport Creek
Figure 9 - North City Park Creek
Figure 10 - South City Park Creek
Figure 11 - South Branch Hylands Creek
Figure 12 - Middle Branch Hylands Creek
Figure 13 - North Branch Hylands Creek
Figure 14 - Walnut Creek
Figure 15 - Countryside Creek
Figure 16 - North Branch Walnut Creek
Figure 17 - Ranch Creek
Figure 18 - South Branch Ranch Creek
Figure 19 - Ketner Creek

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APPENDIX
Cover Sheet - Sheet 1 of 83
Index Sheet - Sheet 2 of 83
Basin Map - Sheets 3 and 4 of 83
Plan and Profile Sheets 5-83 of 83

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6-7
8-9
31-46