1997-03-19_REPORT - M1981302

• Permit No: M1981302
• IBM Index Class Name: Report
• Doc Date: 3/19/1997
• Doc Name: INITIAL RECONNAISSANCE OF DRAINAGE NETWORK AND SOUTH BOULDER CREEKS HYDROLGOY HWY 36 TO APPROXIMATEL
• From: TAGGART ENGINEERING ASSOC INC
• To: URBAN DRAINAGE AND FLOOD CONTROL DISTRICT
• Media Type: D
• Archive: No

' TABLE OF CONTENTS
SECTION I - SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . : . . . . . . . . . . . . . . . 1-1
Scope . . . . . . . . . . . . . . . . . . 1-2
Data Obtained and Reviewed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Modeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Findings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-3
Limitation and Recommendations for Future Study and Investigation . . . . 1-5
SECTION 11 - FEATURES AFFECTING LOCAL DRAINAGE AND
SOUTH BOULDER CREEK OVERFLOWS FROM HIGHWAY 36
' TO THE AREA OF THE WELLMAN DITCH . 11-1
. . . . . . . . . . . . . . . . . . . . .General Features . II-1
Key Features Affecting Local Drainage and South Boulder Creek
Overflows - Highway 36 to the Wellman Ditch . . . . . . . . . . . . . . . . . . II-3
SECTION III - PAST HYDROLOGY MODELING REVIEW . . . . . . . . . . . . . III-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . III-1
Basin and Subbasin Delineation and Comparison . . . . . . . . . . . . . . . 111-1
Rainfall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111-3
Corps' Modeling Calibration and Sensitivity Tests . . . . . . . . . . . . . . . . III-5
Review of Corps' SWMM Hydrology Calibration . . . . . . . . . . . . . . . . . . 111-8
SECTION IV - INITIAL HYDROLOGY MODELING OF THE WEST
OVERFLOW AREA OF SOUTH BOULDER CREEK BELOW HIGHWAY 36 . IV-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IV-1
Initial Flow Estimates and Methodology . IV-1
Field Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IV-2
Comparisons with MWE Modeling of Areas Tributary to 55th and
Wellman Ditch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IV-2
Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IV-2
Specific Notes and Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . IV-3
SECTION V - RECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . V-1
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V-1
'I Detailed Study and Analysis Recommendations . . . . . . . . . . . . . . . . . . V-2
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