FLOOD10337 ‎(2)‎

• County: Arapahoe
• Community: Greenwood Village
• Stream Name: Upper Goldsmith Gulch
• Title: Flood Hazard Area Delineation, Upper Goldsmith Gulch
• Date: 4/1/2005
• Prepared For: Urban Drainage and Flood Control District, Arapahoe County and Greenwood Village
• Prepared By: Moser and Associates
• Floodplain - Doc Type: Floodplain Report/Masterplan

1

Section 5

References

4.1
4.2
4.3

General
Floodplain and Floodway .
Comparison With Current Effective Flood Insurance Study.

5-1

4-1
4-1
4-1

Section 4

Flood Hazard Area Delineation

3.1
3.2

3.3
3.4

General.... ..... ........ ...... ....... ...... ............

Hydraulic Parameters... .......................
3.2.1 Channel Cross Sections ..........
3.2.2 Manning's Roughness Coefficients
3.2.3 Bridge/Culvert Characteristics
Analyzed Flood Frequencies ..............
Water Surface Profile Determination

4-1

3-1
3-1
3-1
3-1
3-1
3-2
3-2

Section 3

Hydraulic Analysis

2.4
2.5

2.1
2.2

2.3

Methodology . ,..................... .............. ..........................

CUHP Parameters ....... ,.........................
2.2.1 Subwatershed Delineation ..........................
2.2.2 Watershed Imperviousness .........................
2.2.3 Soils Information ...
2.2.4 Rainfall .............
UDSWM Parameters .........
2.3.1 Routing Elements...
2.3.2 Detention Elements
Comparison of Results
Results... .

3-1

2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-2
2-2
2-2
2-3

Section 2

Hydrologic Analysis

1.1
1.2
1.3
1.4

Authorization and Scope.. ......... ............ ......... ....... .......... ..... ...... ...........
Summary of Data Obtained ... ............... .................... ................. ...... ....

Mapping. ....... .......... ......... ........... ........ ... ............ ...... .......... ........ ..........

Study Area Description..... ..................... ............... ............ ... ................

Section 1

Introduction

1-1

TABLE OF CONTENTS
- - -
List of Tables and Figures
Figure 1-1 Study Area .................... 2-2
Table 2-1 I-Hour Rainfall Depths ..................... 2-2
Table 2-2 Peak Flow Comparison at Belleview . 2-3
Table 2-3 1976 FHAD Peak Flow Comparison 2-3
Table 3-1 Manning's Roughness Coefficients .. . 3-1
APPENDICES
Appendix A Hydrologic Data
Appendix B Floodplain and Floodway Data Table
Appendix C Manning's "n" Determination Photos
Appendix D Drainage Structure Photos
Appendix E Flood Hazard Area Delineation Drawings

2-1

1-1
1-1
1-1
1-2