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Final South Boulder Creek Major Drainageway Plan–Alternatives Analysis Report

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Final South Boulder Creek Major Drainageway Plan–Alternatives Analysis Report FINAL SOUTH BOULDER CREEK MAJOR DRAINAGEWAY PLAN–ALTERNATIVES ANALYSIS REPORT Prepared for: CITY OF BOULDER URBAN DRAINAGE AND FLOOD CONTROL DISTRICT August 2015 9191 South Jamaica Street Englewood, CO 80112-5946 Phone (303) 771-0900 Fax (720) 286-9250 THIS PAGE INTENTIONALLY LEFT BLANK. Transmittal Letter 9193 South Jamaica Street Englewood, CO 80112 Tel 303-771-0900 Fax 720.286.8637 August 13, 2015 Project Number: 240043 City of Boulder Public Works Department Utilities Division Mr. Kurt Bauer, P.E. Project Manager P.O. Box 791 Boulder, CO 80306 Subject: Final South Boulder Creek Major Dranageway Plan – Alternatives Analysis Report Dear Mr. Bauer CH2M HILL is pleased to submit the Final South Boulder Creek Major Drainageway Plan – Alternatives Analysis Report.. The South Boulder Creek Alternatives Analysis report focused on alternatives to alleviate flooding through the West Sincerely, Valley North of US-36.. This watershed was previously studied in the Major Drainageway Planning – Phase A Report (Taggert Engineering, Inc., 2001) and subsequently during the South Boulder Creek Flood Mapping Study (HDR, DHI, Alan Turner, P.E. No. 38982 Aaron Cook, P.E. No. 45916 CH2M HILL, 2003 – 2008). This report builds on the South Boulder Creek Flood Mapping Study that included the Project Manager Project Engineer following reports: 1. Climatology and Hydrology Report (HDR, CH2M Hill and DHI, February 6, 2007); 2. Hydraulic Modeling Report (HDR, CH2M Hill and DHI, December 30, 2008); 3. and the Risk Assessment Report (HDR, CH2M Hill, and DHI, May 2009) The Final South Boulder Creek Major Drainageway Plan – Alternatives Analysis Report presents the conceptual design to address the flooding problems through the West Valley as defined by the reports listed above. This report provides CH2M HILL conceptual level guidance and recommendations for the phasing, location, and rough budgets for flood control c: Shea Thomas, P.E. / Urban Drainage and Flood Control District facilities that aid in the elimination of flood threats through the West Valley. This report is intended as an informational guide to help the City in long-term planning, stakeholder coordination, and further community involvement, as the concepts laid out in this report are further refined and designed. We appreciate the opportunity to complete this important mitigation project for the City. TRANSMITTAL LETTER i FINAL _SBC_MITIGATION_REPORT_082015 THIS PAGE INTENTIONALLY LEFT BLANK TRANSMITTAL LETTER ii FINAL _SBC_MITIGATION_REPORT_082015 Flooding Problems .......................................................................................................................... IV-4 Table of Contents V. Alternative Development .............................................................................................................................. V-1 Transmittal Letter .............................................................................................................................................. i Alternative Development Process ................................................................................................... V-1 Table of Contents ............................................................................................................................................. iii Constraints and Criteria ................................................................................................................... V-2 Table of Tables ................................................................................................................................................ iV VI. Conceptual Alternative Plans ....................................................................................................................... VI-1 Table of Figures ................................................................................................................................................ iv Alternative Plan Formulation .......................................................................................................... VI-1 Appendicies ...................................................................................................................................................... v Alternative Plan Identification ........................................................................................................ VI-1 Acronyms ......................................................................................................................................................... vi Conceptual Alternative Plan Evaluation ......................................................................................... VI-2 ES. Executive Summary ..................................................................................................................................... ES-1 Flood Damages ............................................................................................................................... VI-3 Purpose and Scope ......................................................................................................................... ES-1 Project Benefits ............................................................................................................................... VI-3 Planning Process ............................................................................................................................. ES-1 Alternative Costs ............................................................................................................................. VI-4 Recommended Plan ........................................................................................................................ ES-3 Benefit-Cost Analysis ...................................................................................................................... VI-4 Recommended Plan Elements ........................................................................................................ ES-3 Other Considerations ...................................................................................................................... VI-4 Recommended Phasing .................................................................................................................. ES-4 VII. Best Alternative Plans ................................................................................................................................. VII-1 I. Introduction ................................................................................................................................................... I-1 Project Benefits .............................................................................................................................. VII-2 Authorization .................................................................................................................................... I-1 Alternative Costs ............................................................................................................................ VII-2 Purpose and Scope ........................................................................................................................... I-1 Benefit-Cost Analysis ..................................................................................................................... VII-3 Planning Process ............................................................................................................................... I-1 Other Considerations ..................................................................................................................... VII-3 Mapping ............................................................................................................................................ I-2 Best Alternative Plan Evaluation Summary ................................................................................... VII-4 Data Collection ................................................................................................................................. I-2 VIII. Refinement of Best Alternative Plans ........................................................................................................ VIII-1 Planning Context, Laws, Regulations and Criteria ............................................................................ I-3 Introduction .................................................................................................................................. VIII-1 Acknowledgements .......................................................................................................................... I-3 Alignment Refinements ................................................................................................................ VIII-1 II. Study Area Description ................................................................................................................................. II-1 Costs Refinements ........................................................................................................................ VIII-1 Study Area........................................................................................................................................ II-1 Refined Benefits ............................................................................................................................ VIII-1 Land Use .......................................................................................................................................... II-1 Other Considerations
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