FLOOD09671

• County: Jefferson
• Stream Name: Woman Ccreek, Walnut, Upper Big Dry and Rock Creek
• Basin: South Platte
• Title: Rocky Flats Plant Drainage and Flood Control Master Plan
• Date: 4/1/1992
• Prepared For: The Department of Energy Rocky Flats Plant
• Prepared By: Wright Water Engineers, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

TABLE OF CONTENTS (cont'd)

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APPENDIX V-B - TECHNICAL MEMORANDUM ON FLOOD
RUNOFF FROM COAL CREEK ............... V-13

APPENDIX V-C - SUPPLEMENTAL REPORT:
SEDIMENT REPORT ON COAL CREEK IN
VICINITY OF HEAD GATES TO UPPER
CHURCH AND KINNEAR DITCHES........... V-29

SECTION VI

CHANNEL HYDRAULICS AND FLOODPLAIN DELINEATION

FLOODPLAIN MODELLING ....................... VI-2
CHANNEL HYDRAULICS PROCEDURE (HEC-2) . . . . .. VI-2
HEC-2 RESULTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. VI-3
Floodplain Delineation . . . . . . . . . . . . . . . . . . . . . . .. VI-3
Comparison with USACE Floodplains. . . . . . . . . . . .. VI-4

APPENDIX VI-A - HEC-2 INPUT. . . . . . . . . . . . . . . . . . .. VI-5

APPENDIX VI-B - HEC-2 OUTPUT. . . . . . . . . . . . . . . . . . VI-15

SECTION VII

CORE AREA DRAINAGE

STUDY AREA DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . VII-2
HYDROLOGY .................................. VII-4
Description of Models ........................ VII-4
Core Area Assumptions for CUHP jHydroCAD

Models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VII-7
RESULTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VII-7
CUHP Model Results . . . . . . . . . . . . . . . . . . . . . . . . . VII-7
HydroCAD Model Results ..................... VII-9
SYNOPSIS OF DRAINAGE DEFICIENCIES .......... VII-lO
SUMMARY OF CORE AREA STUDY. . . . . . . . . . . . . . . VII-12

SECTION VIII

WATER QUALITY
OPTIONS ANALYSIS

SECTION IX

BIBLIOGRAPHY

OFF-SITE SERIES OPTIONS ....................... IX-5
OS-l BASIN SL 6 REDIRECTION .............. IX-7
OS-2 COAL CREEK FLOOD ELIMINATION..... IX-8
OS-3 KINNEAR DITCH RELOCATION.......... IX-9

TABLE OF CONTENTS (cont'd)

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OS-4 UPPER ROCK CREEK CAPACITY
ENHANCEMENT..........................IX-lO
OS-5 SOUTH BOULDER DIVERSION CANAL
INTERCEPTION. . . ............ .. . . . . . . . ... IX-ll

BUFFER ZONE SERIES OF OPTIONS............... IX-13
BZ-l A-SERIES PONDS BYPASS PIPE
CAPACITY ENHANCEMENT ................ IX-15
BZ-2 B-SERIES PONDS BYPASS PIPE
CAPACITY ENHANCEMENT........ ......... IX-16
BZ-3 POND VOLUME MANAGEMENT......... IX-17
BZ-4 WOMAN CREEK AT INDIANA STREET
RESERVOIR ............................. IX-18

CORE AREA SERIES OF OPTIONS ................. IX-19
CA-l REPLACE EXISTING CULVERT
SECURITY CONSTRICTIONS ................ IX-2l
CA-2 CENTRAL A VENUE DRAINAGE
IMPROVEMENTS ......................... IX-2l
CA-3 OUTFALL SYSTEM TO POND B-5 . . . . . . . . . IX-22
CA-4 BUILDING 991 FLOOD MITIGATION. . . . . . IX-22
CA-5 BUILDING 335 FLOOD MITIGATION . . . . . . IX-23
CA-6 CULVERT INSTALLATION NORTH
OF SOLAR PONDS AND AT THE 1771
TRAILER COMPLEX ....................... IX-23
CA-7 1"230 TRAILER AREA WEST
OF BUILDING 771 FLOODPROOFING ......... IX-24
CA-8 PARKING IMPROVEMENTS NEAR
BUILDING 771 ............................ IX-25
CA-9 LOCAL DRAINAGE IMPROVEMENTS . . . . . IX-25

APPENDIX IX-A - DENVER WATER DEPARTMENT
LETTER ON DIVERSION OF WATER AROUND
ROCKY FLATS IN SOUTH BOULDER DIVERSION

CANAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IX-27