FLOOD10116

• County: Douglas
• Community: Douglas County
• Stream Name: Dad Clark Gulch
• Basin: South Platte
• Title: FHAD - Dad Clark Gulch
• Date: 2/1/1980
• Prepared For: Douglas County
• Prepared By: UDFCD
• Floodplain - Doc Type: Floodplain Report/Masterplan

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
,I

Sect ion

I.

II.

Ill.

IV.

V.

VI.

APPENDIX

LIST OF TABLES

TABLE OF CONTENTS

Page

TABLE 1 - DESIGN 100-YEAR RAINFALL PATTERN .......................
TABLE 2 WATERSHED AND HYDROGRAPH PARAMETERS AND CALCULATED PEAK

FLOW RATES .............................................

ABSTRACT

1

INTRODUCTION .......................................... 1

TABLE 2A- PEAK FLOW RATES.........................................

A. Scope of Work .................................. 1
B. Coordination................................... 2
C. Methodology.................................... 2

TABLE 3 - FLOOD PLAIN AND FLOODWAY REFERENCE DATA (without
tentat ive culvert-type road crossings), sheets A - G ...

TABLE 4 - FLOOD PLAIN AND FLOODWAY REFERENCE DATA (backwater at
tentative culvert-type road crossings sheets), A and B .

DRAINAGE BASIN CHARACTERISTICS. ... .................... 2

A. Gener a 1 ........................................ 2

B. Dad Clark Gulch ................................ 2
C. Cl imatology and Flood History.................. 3

LIST OF FIGURES

HYDROLOGIC ANALYSIS ................................... 4
HYDRAULI CANAL YS IS.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 8
FLOOD HAZARD AREA DELINEATION ....... ...... ......... ... 9

FIGURE

1 - PEAK TIME AND RATE OF FLOW COEFFICIENTS

FIGURE 2 - IMPERVIOUS AREA/HOUSING DENSITY CURVE

FIGURE 3 - SAMPLE FLOOD HYDROGRAPHS (at stations
101+23 AND 147+00) ...................................

FIGURE 4 - SAMPLE FLOOD HYDROGRAPHS (at stations
801 + 16 AND 209+80) ...................................

FIGURE 5 - SAMPLE FLOOD HYDROGRAPHS (at stations
512+65 AND 301+00) ...................................

FIGURE 6 - PEAK FLOW PROFILE (Reach 1 from
station 100+00 to station 240+00)

A. Flood Frequency and Discharge .......... ........ 9
B. Flood Plain and Floodway Data ....... ........... 9
C. Flood Velocities and Erosion Potential......... 11

REFERENCES ............................................ 12

FIGURE

7 - PEAK FLOW PROFILE (Reach 1 from
station 240+00 to station 380+00)

Flood Plain and Floodway Reference Data
Sample Flood Hydrographs
Peak Flow Profiles
Flood Hazard Area .Del ineation Drawings, Sheets 1 through 23

FIGURE 8 - PEAK FLOW PROFILE (Reaches 2 and 3 from
station 380+00 to station 520+00) ............. .......

FIGURE 9 - PEAK FLOW PROFILE (Reaches 3 and 4 from
station 520+00 to station 660+00) .......... ..........

FIGURE 10 - PEAK FLOW PROFILE (Reach 5 from
station 660+00 to station 800+00)

FIGURE 11 - PEAK FLOW PROFILE (Reach 6 from
station 800+00 to station 940+00)

'?6'

~~

5
7

7

Appendix

Append ix

6
6

Append ix

Appendix

Appendix

Appendix

Appendix

Append ix

Appendix

Append ix

Append ix