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Sewer Design Guide (Revised May, 2015)

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Sewer Design Guide (Revised May, 2015) Sewer Design Guide (Revised May, 2015) City of San Diego Public Utilities Department 9192 Topaz Way • San Diego, CA 92123 Tel (858) 292-6300 Fax (858) 292-6310 Sewer Design Guide PREFACE The Sewer Design Guide is a guide for the engineer when planning and designing wastewater facilities and should be used for both public facilities and private facilities which serve multiple lots. This guide summarizes and outlines relevant City policies, applicable codes, and engineering and operational practices and procedures that have been developed in an effort to establish a cost-effective, reliable, and safe wastewater collection system. Also to be considered and used in conjunction with this design guide are all applicable current standard drawings, specifications, codes, laws and industry requirements for the planning and design of wastewater infrastructures. This guide is not intended to be an instructional text and is not a substitute for professional experience, nor is it meant to relieve the design engineer from his/her responsibility to use good engineering judgment. The design engineer shall be responsible for providing a design that, within industry standards, can be safely repaired and maintained, will provide good service and life, and will not create a public nuisance or hazard. Under most conditions, this guide should serve as a minimum standard. However, it is not meant to preclude alternative designs when the standards cannot be met, or when special or emergency conditions warrant, as long as proper authorization is obtained. The Public Utilities Department encourages “partnering”, the creation of an open working relationship between staff in each section/department and our customers, to promote achievement of mutual and beneficial goals. All projects can benefit when common goals and interests are identified, lines of communication are established and open, and there is a commitment from all parties to solve problems collaboratively. We would like to continue to make positive changes to this document as standards, technology, and materials change. Please submit to your Senior Civil Engineer, in writing, any changes you think warrant consideration. Many people have endeavored to make this document useful and representative of good engineering and maintenance practices. The Public Utilities Department would like to acknowledge and thank the individuals who have invested considerable effort in establishing and improving the Sewer Design Guide. Roger S. Bailey Director of Public Utilities Sewer Design Guide Preface 2013 Sewer Design Guide SPECIAL ACKNOWLEDGMENTS The Committee recognizes the contribution by the following individuals in the revision, preparation, and editing of the 2013 Sewer Design Guide. Rania Amen Paul Buehler Berric Doringo Ernesto Fernandez Dave Grossman Isam Hireish Cha Moua Huy Nguyen Stephanie Pang Tung Phung Nabeel Qawasmi Margaret Quach Bobbi Salvini Jamal Shamoon Richard VanderSchaff Sewer Design Guide Acknowledgments 2013 Sewer Design Guide SEWER DESIGN GUIDE TABLE OF CONTENTS Page INTRODUCTION ............................................................................................................................... 1 CHAPTER 1 SEWER SYSTEM PLANNING ........................................................................... 1-1 1.1 GENERAL ..................................................................................................................... 1-1 1.2 PRELIMINARY PROJECT PLANNING ..................................................................... 1-1 Alignment and Grade of Mains… .................................................................................. 1-1 New Mains ............................................................................................................... 1-1 Relocated Mains ...................................................................................................... 1-2 Precedence of Sewer Facilities ................................................................................ 1-2 Private Mains ........................................................................................................... 1-2 Easements for Mains ................................................................................................ 1-3 Pump Station Location ................................................................................................... 1-3 Sewers in Canyons and Environmentally Sensitive Lands ............................................ 1-3 1.3 PLANNING STUDY ..................................................................................................... 1-4 General Requirements .................................................................................................... 1-4 Capacity ................................................................................................................... 1-5 Drainage Basin ......................................................................................................... 1-5 Depth of Mains ........................................................................................................ 1-6 Existing Studies ....................................................................................................... 1-6 Flow Estimation ............................................................................................................. 1-6 Land Use ................................................................................................................ 1-6 Flow Determination ................................................................................................. 1-6 Pipe Sizing Criteria ........................................................................................................ 1-8 Hydraulic Requirements .......................................................................................... 1-8 Slope ........................................................................................................................ 1-9 Ratio of Depth of Flow to Pipe Diameter (dn/D) ..................................................... 1-9 Minimum Pipe Sizes ................................................................................................ 1-9 Sewer Study Exhibit Criteria .......................................................................................... 1-9 Private On-Site Wastewater Treatment and Reuse ............................................. 1-9 1.4 SEPARATION OF MAINS ........................................................................................... 1-9 Horizontal Separation ..................................................................................................... 1-9 Wet Utilities ............................................................................................................. 1-9 Separation for Dry Utility Pipes and Cable Conduits ............................................ 1-10 Vertical Separation ....................................................................................................... 1-10 Shallow Mains, General ......................................................................................... 1-10 Parallel Mains ........................................................................................................ 1-10 Crossing Mains ...................................................................................................... 1-11 1.5 PUMP STATION PLANNING CRITERIA ................................................................ 1-11 Pump Station Design Capacity ..................................................................................... 1-11 Private Pump Stations .................................................................................................. 1-12 1.6 ZONE-DENSITY CONVERSIONS ............................................................................ 1-12 1.7 REQUIRED CAPACITY IN EXISTING SEWER SYSTEMS DOWNSTREAM OF NEW FACILIITIES .................................................................. 1-13 Sewer Design Guide Table of Contents i 2013 Sewer Design Guide Required Capacity Downstream of New Gravity Sewers ............................................ 1-13 Required Capacity Downstream of New Pump Stations .............................................. 1-13 Odor Control................................................................................................................. 1-14 1.8 MINIMUM INTAKE STANDARDS FOR SEWER STUDIES ................................. 1-14 CHAPTER 2 GRAVITY SEWER SYSTEM DESIGN ............................................................. 2-1 2.1 GENERAL ..................................................................................................................... 2-1 2.2 DESIGN OF SEWER MAINS ....................................................................................... 2-1 General Considerations .................................................................................................. 2-1 Determination of Allowable Loading ............................................................................. 2-1 Design Deflection of PVC Pipes .................................................................................... 2-1 Traffic Loads, Dead Loads, and Other Loads ................................................................ 2-2 Concrete Encasement/Casing ......................................................................................... 2-2 Depth of Mains ..............................................................................................................
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