FLOOD06085

• Designation Number: 570
• County: Douglas
• Community: Unincorporated Douglas County
• Basin: South Platte
• Title: FHAD - Cherry Creek Corridor - Reservoir To Scott Road
• Date: 5/1/2003
• Designation Date: 9/30/2003
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Preface

Section 1

Section 2

Section 3

Section 4

Section 5

Section 6

List ofT abies

......................................................................................................................................PR-1

INTRODUCTION ..............................................................................................................1-1

Table I
Table 2
Table 3
Table 4
Table 5
Table 6

Cherry Creek Watershed Vicinity Climatological Data
Stream Gage Data
Annual Peak Discharges for Cherry Creek near Franktown, Colorado
Annual Peak Discharges for Cherry Creek near Melvin, Colorado
Summary ofFEMA FIS Pertinent Discharges Used in Current Study
Floodplain and Floodway Data

List of Photographs/Figures

Cherry Creek Looking upstream from Scott Road Bridge
Cherry Creek Looking downstream from Scott Road Bridge
Cherry Creek Upstream of Stroh Road Bridge
Cherry Creek Looking Downstream from Stroh Road Bridge
Cherry Creek Looking Upstream from Main Street Bridge
Cherry Creek Looking Downstream from Main Street Bridge
Left Overbank Looking Downstream from Main Street Bridge
Cherry Creek Looking Upstream from Lincoln A venue Bridge
Right Overbank Looking Downstream from Lincoln Avenue Bridge
Cherry Creek Looking Downstream Approx. 500 ft U/S of Cottonwood Drive
Cherry Creek Looking Upstream from Cottonwood Drive Bridge
Cherry Creek Looking Downstream from Cottonwood Drive Bridge
Left Overbank Looking upstream from near Arapahoe Road Bridge
Cherry Creek Looking downstream from Arapahoe Road Bridge
Cherry Creek Looking upstream from Approximately Orchard Road
Cherry Creek Looking downstream from Approximately Orchard Road
Cherry Creek Looking downstream at Confluence with Piney Creek
Flow Discharge Profile

Cherry Creek Watershed Map
FHAD Plan Sheet Index Map

List of Flood Hazard Area Delineation (FHAD) Plans
Sheet I Plan STA. 836+00 to STA. 890+00
Sheet 2 Plan STA. 936+00 to STA. 950+00

Ll THE STREAM AND ITS VALLEy....................................................... 1-1
L2 CHERRY CREEK CORRIDOR.........................................................,.... 1-1
1.2.1 Stream Characteristics ................................................................. 1-1

1.2.2 Reservoirs .................................................................................... 1-1
1.23 Diversions .................................................................................... 1-2
1.3 SOIL CHARACTERISTICS ...................................................................1-2
1.4 WATERSHED IMPERVIOUSNESS...................................................... 1-2
1.5 VEGETATION ........................................................................................1-2
1.6 DEVELOPMENT IN THE FLOODPLAIN ............................................ 1-2

Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
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Figure 10.
Figure 11.
Figure 12.
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Figure 16.
Figure 17.
Figure 18.

FLOOD CHARACTERiSTiCS.......................................................................................... 2-1

2.1 SOURCES OF FLOOD DATA AND RECORDS.................................. 2-1
2.2' FLOOD SEASON AND FLOOD CHARACTERISTICS ...................... 2-1
23 FACTORS AFFECTING FLOODING AND ITS IMPACT .................. 2-1
23.1 Obstructions to Floodflows.......................................................... 2-1
23.2 Flood Damage Reduction Measures ............................................ 2-2

PAST FLOODS................................................................................................................ 3-1

3.1 SUMMARY OF HISTORICAL FLOODS .............................................3-1
3.2 FLOOD DESCRIPTIONS ....................................................................... 3-1

FUTURE FLOODS........................................................................................................... 4-1

4.1 METHODOLOGY FOR FLOODPLAIN DELINEATION.................... 4-1

4.1.1 Hydrology .................................................................................... 4-1
4.1.2 Hydraulics .................................................................................... 4-1
4.2 FREQUENCY OF FLOODS ................................................................... 4-1
4.3 HAZARDS OF LARGE FLOODS.......................................................... 4-2
43.1 Flooded Areas and Flood Damages. ............................................ 4-2
43.2 Obstructions to Floodflows.......................................................... 4-3
433 Velocities of Flow ........................................................................ 4-3
43.4 Rate of Rise and Duration of Flooding........................................ 4-3
43.5 Floodway Delineation.................................................................. 4-3

List of Plates

Plate I
Plate 2

GLOSSARY OF TERMS..................................................................................................5.1

REFERENCES.............................................................................................:................... 6.1