Master Plan of Drainage 2013

CITY OF BREA MASTER PLAN OF DRAINAGE 2013 PREPARED FOR THE CITY OF BREA DEPARTMENT OF PUBLIC WORKS 1 CIVIC CENTER CIRCLE BREA, CA 92821 DATE: DECEMBER 2013 PREPARED BY WILLDAN ENGINEERING 2401 E. KATELLA AVENUE, SUITE 450 ANAHEIM, CA 92806 CITY OF BREA MASTER PLAN OF DRAINAGE 2013 PREPARED FOR THE CITY OF BREA DEPARTMENT OF PUBLIC WORKS 1 CIVIC CENTER CIRCLE BREA, CA 92821 DATE: DECEMBER 2013 PREPARED UNDER THE DIRECTION OF RAY WELLINGTON, PE WILLDAN ENGINEERING 2401 E. KATELLA AVENUE, SUITE 450 ANAHEIM, CA 92806 City of Brea Master Plan of Drainage 2013 CITY OF BREA MASTER PLAN OF DRAINAGE 2013 TABLE OF CONTENTS EXECUTIVE SUMMARY ................................................................................................... 1 SECTION 1 – INTRODUCTION AND HISTORY ............................................................... 3 1.1 Authorization and Scope ..................................................................................... 3 1.2 Description of Study Area and Facilities .............................................................. 3 Location .............................................................................................................. 3 Land Use & Zoning ............................................................................................. 3 Climate ............................................................................................................... 3 Topography ......................................................................................................... 4 Geology and Soils ............................................................................................... 4 Drainage Patterns & Regional Facilities .............................................................. 4 City Drainage Facilities ....................................................................................... 5 Inventory of City Facilities ................................................................................... 5 Pump Stations .................................................................................................... 5 Caltrans Facilities ................................................................................................ 5 Private Facilities .................................................................................................. 5 SECTION 2 - RESEARCH DESCRIPTIONS ..................................................................... 6 2.1 Available Records ............................................................................................... 6 2.2 Field Visits, Drainage Boundary/Pattern Observation .......................................... 6 2.3 Closed Circuit Television Investigation ................................................................ 6 2.4 FEMA Flood Insurance Rate Maps .................................................................... 10 SECTION 3 - GIS BASE MAPPING AND FEATURES .................................................... 10 3.1 Base Map .......................................................................................................... 10 3.2 Storm Drain Database ....................................................................................... 10 3.3 Location Data .................................................................................................... 10 3.4 Hydraulic Modeling GIS Data ............................................................................ 11 SECTION 4 - HYDROLOGY STUDY DATA AND HYDRAULIC CALCULATIONS .......... 12 4.1 Introduction ....................................................................................................... 12 4.2 Assumptions Utilized ......................................................................................... 12 4.3 Flood Frequency ............................................................................................... 13 10-year and 25-year Recurring Frequency Design Storm Application ............... 13 4.4 Criteria for the Hydrology and Hydraulics Evaluation ......................................... 13 Methodology ..................................................................................................... 13 Model Setup ...................................................................................................... 14 Loss Parameters (Runoff Coefficients) .............................................................. 14 Rainfall Intensity (Precipitation) ......................................................................... 16 City of Brea Master Plan of Drainage 2013 i Channel Routing ............................................................................................... 16 Time of Concentration ....................................................................................... 16 Modeling Results and Maps .............................................................................. 17 Deficiencies based upon hydraulic analysis ...................................................... 20 4.5 Drainage Summary ........................................................................................... 22 References ...................................................................................................................... 23 SECTION 5 – CAPITAL IMPROVEMENT PROGRAM DEVELOPMENT......................... 23 5.1 Localized Water Ponding during Storms ............................................................ 23 5.2 Deficiency Causes and Solutions ...................................................................... 23 5.3 Basis of Prioritizing Projects .............................................................................. 23 5.4 Mitigation Measures and Design Alternatives .................................................... 27 Storm Drain Extensions .................................................................................... 27 Parallel Storm Drain Systems ........................................................................... 27 Upsizing Existing Catch Basin Inlets and/or Connector Pipes ........................... 27 Coordination with Other CIP Projects ................................................................ 27 5.5 Countywide Drainage Handling Criteria ............................................................. 27 5.6 National Pollution Discharge Elimination System (NPDES) ............................... 27 5.7 Detention Basins ............................................................................................... 28 5.8 Proposed Storm Drain System Improvements - CIP .......................................... 28 SECTION 6 - FINANCIAL STRATEGY ALTERNATIVES ................................................ 29 6.1 General Discussion ........................................................................................... 29 6.2 Funding Programs ............................................................................................. 29 General Fund .................................................................................................... 29 Drainage Fees .................................................................................................. 30 Federal Housing and Community Development Act of 1974 ............................. 30 Special Assessments ........................................................................................ 31 Municipal Improvement Act of 1913 .................................................................. 31 Benefit Assessment Act of 1982 ....................................................................... 31 Highway Improvement Projects ......................................................................... 32 Mello-Roos Community Facilities Act of 1982 ................................................... 32 General Obligation Bonds ................................................................................. 32 LIST OF TABLES Table 1-A Watershed Acreages .................................................................................... 5 Table 2-A CCTV Investigation Results Summaries ...................................................... 8 Table 4-A Impervious Fractions Based upon Land Use (loss parameters) .................. 14 Table 4-B Pressurized Pipe Conduits in the Brea Creek Watershed ........................... 17 Table 4-C Pressurized Pipe Conduits in the Carbon Creek Watershed ...................... 18 Table 4-D Pressurized Pipe Conduits in the Fullerton Creek Watershed .................... 18 Table 4-E Pressurized Pipe Conduits in the Imperial Creek Watershed ..................... 19 Table 4-F Pressurized Pipe Conduits in the Southerly Subareas ............................... 20 City of Brea Master Plan of Drainage 2013 ii Table 4-G Listing of Capacity Deficient Pipe segments in existing system ................. 21 Table 5-A Capacity Deficient Pipe segments Ranked for priority action ..................... 24 Table 5-B Storm Drainage Improvements Summary .................................................. 28 APPENDICES APPENDIX A - GENERAL PLAN ZONING MAP - Adopted February 2010 APPENDIX B - COUNTY OF ORANGE WATERSHEDS overlying the City APPENDIX C - CITY DRAINAGE AREAS (showing CIP Project locations and Pressurized Pipe segments) APPENDIX D - CCTV INSPECTION – Identified Structural and Maintenance Deficiencies & Local Street Ponding areas APPENDIX E - HYDROLOGY/HYDRAULIC CALCULATIONS – 10 YEAR STORM EVENT [Maps in Appendix F correlate with these output sheets] APPENDIX F – WATERSHED MAPS WITH MODELING SUBZONES & COLLECTION POINTS [Correlates with Appendix

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