Sewer Design Guide - San Diego
Sewer Design Guide(Revised May, 2015)City of San DiegoPublic Utilities Department9192 Topaz Way San Diego, CA 92123Tel (858) 292-6300 Fax (858) 292-6310
Sewer Design GuidePREFACEThe Sewer Design Guide is a guide for the engineer when planning and designingwastewater facilities and should be used for both public facilities and private facilitieswhich serve multiple lots. This guide summarizes and outlines relevant City policies,applicable codes, and engineering and operational practices and procedures that havebeen developed in an effort to establish a cost-effective, reliable, and safe wastewatercollection system. Also to be considered and used in conjunction with this design guideare all applicable current standard drawings, specifications, codes, laws and industryrequirements for the planning and design of wastewater infrastructures.This guide is not intended to be an instructional text and is not a substitute forprofessional experience, nor is it meant to relieve the design engineer from his/herresponsibility to use good engineering judgment. The design engineer shall beresponsible for providing a design that, within industry standards, can be safely repairedand maintained, will provide good service and life, and will not create a public nuisanceor 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 bemet, or when special or emergency conditions warrant, as long as proper authorization isobtained.The Public Utilities Department encourages “partnering”, the creation of an openworking relationship between staff in each section/department and our customers, topromote achievement of mutual and beneficial goals. All projects can benefit whencommon goals and interests are identified, lines of communication are established andopen, 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, inwriting, any changes you think warrant consideration.Many people have endeavored to make this document useful and representative of goodengineering and maintenance practices. The Public Utilities Department would like toacknowledge and thank the individuals who have invested considerable effort inestablishing and improving the Sewer Design Guide.Roger S. BaileyDirector of Public UtilitiesSewer Design GuidePreface2013
Sewer Design GuideSPECIAL ACKNOWLEDGMENTSThe Committee recognizes the contribution by the following individuals in therevision, preparation, and editing of the 2013 Sewer Design Guide.Rania AmenPaul BuehlerBerric DoringoErnesto FernandezDave GrossmanIsam HireishCha MouaHuy NguyenStephanie PangTung PhungNabeel QawasmiMargaret QuachBobbi SalviniJamal ShamoonRichard VanderSchaffSewer Design GuideAcknowledgments2013
Sewer Design GuideSEWER DESIGN GUIDETABLE OF CONTENTSPageINTRODUCTION. 1CHAPTER 1 SEWER SYSTEM PLANNING . 1-11.1GENERAL . 1-11.2PRELIMINARY PROJECT PLANNING . 1-1Alignment and Grade of Mains . 1-1New Mains . 1-1Relocated Mains . 1-2Precedence of Sewer Facilities . 1-2Private Mains . 1-2Easements for Mains . 1-3Pump Station Location . 1-3Sewers in Canyons and Environmentally Sensitive Lands . 1-31.3PLANNING STUDY . 1-4General Requirements . 1-4Capacity . 1-5Drainage Basin. 1-5Depth of Mains . 1-6Existing Studies . 1-6Flow Estimation . 1-6Land Use . 1-6Flow Determination . 1-6Pipe Sizing Criteria . 1-8Hydraulic Requirements . 1-8Slope . 1-9Ratio of Depth of Flow to Pipe Diameter (dn/D) . 1-9Minimum Pipe Sizes . 1-9Sewer Study Exhibit Criteria . 1-9Private On-Site Wastewater Treatment and Reuse . 1-91.41.51.61.7SEPARATION OF MAINS . 1-9Horizontal Separation . 1-9Wet Utilities . 1-9Separation for Dry Utility Pipes and Cable Conduits . 1-10Vertical Separation . 1-10Shallow Mains, General . 1-10Parallel Mains . 1-10Crossing Mains . 1-11PUMP STATION PLANNING CRITERIA . 1-11Pump Station Design Capacity . 1-11Private Pump Stations . 1-12ZONE-DENSITY CONVERSIONS . 1-12REQUIRED CAPACITY IN EXISTING SEWER SYSTEMSDOWNSTREAM OF NEW FACILIITIES. 1-13Sewer Design GuideTable of Contentsi2013
Sewer Design Guide1.8Required Capacity Downstream of New Gravity Sewers . 1-13Required Capacity Downstream of New Pump Stations . 1-13Odor Control. 1-14MINIMUM INTAKE STANDARDS FOR SEWER STUDIES . 1-14CHAPTER 2 GRAVITY SEWER SYSTEM DESIGN . 2-12.1GENERAL . 2-12.2DESIGN OF SEWER MAINS . 2-1General Considerations . 2-1Determination of Allowable Loading . 2-1Design Deflection of PVC Pipes . 2-1Traffic Loads, Dead Loads, and Other Loads . 2-2Concrete Encasement/Casing . 2-2Depth of Mains . 2-2Shallow Mains . 2-3Depth of Dead-End Mains . 2-3Redundant Sewers . 2-3Sewer Mains 15 Inches and Smaller in Diameter. 2-4Minimum Depths . 2-4Changes in Direction . 2-4Requirements for Depths Greater Than 15 Feet . 2-4Sewer Mains 18 Inches and Larger in Diameter (Trunk Sewers) . 2-4Changes in Direction . 2-4Allowable Loading . 2-5Shop Drawing/Material Submittal Requirements . 2-5Trench Details . 2-5Hydraulic Jumps . 2-5Alignment of Sewers . 2-6Utility Crossings . 2-7Profile of Sewers . 2-8Cutoff Walls . 2-8Curvatures . 2-9Curvature in Rigid Pipes . 2-9Curvature in Flexible Pipes . 2-10Horizontal Curvature . 2-10Vertical Curvature . 2-11Prohibited Locations. 2-11Main Extensions . 2-122.3MANHOLES . 2-12General Design Considerations . 2-12Required Locations. 2-12Prohibited Locations. 2-12Manholes at Street Intersections . 2-13Manholes Outside Public Right-of-Way . 2-13Potential Hydraulic Jumps. 2-13Cul-De-Sac and Dead End Mains. 2-13Distance Between Manholes . 2-14Design of Manhole Shelves . 2-14Manhole Frames and Covers . 2-15Sewer Design GuideTable of Contentsii2013
Sewer Design Guide2.42.52.6Manhole Lining and Grouting . 2-15Bases. 2-15Riser Joints . 2-15Risers . 2-16Exterior Walls. 2-16Minimum Invert Drop Across a Manhole . 2-16Manholes with the Same Inlet and Outlet Diameter. 2-16Outlet Pipe Larger Than Inlet . 2-17Maximum Invert Drops Across Manhole . 2-18Minimum Manhole Size . 2-18Large Diameter Manholes . 2-18Deep Manholes . 2-18Inspection of Existing Manholes . 2-19Raising Manhole Covers . 2-19PIPE BEDDING . 2-19Normal Bedding Requirements . 2-19Special Considerations . 2-19Load Factors for Clay Pipe . 2-19SEWER LATERALS . 2-20Allowable Locations. 2-20Depth Requirements . 2-20Slope . 2-21Cleanouts . 2-21Bedding . 2-21Backwater Devices . 2-21Pressure Laterals. 2-22Connections to Existing Mains. 2-22Required Location of Connections . 2-22Allowable Types of Connections . 2-23Size of Connections . 2-23Required Rise From Main . 2-23Connections to Trunk Sewers. 2-23Common Laterals . 2-24Easement Laterals. 2-24Main Extension Waiver . 2-24Single Family Residence . 2-25Standard Deviation Category . 2-25Cul-De-Sac Deviation Category . 2-25Multi-Family Residential and Commercial Units . 2-25Encroachment Maintenance and Removal Agreement (EMRA) . 2-25Laterals Crossing Lot Lines . 2-26Lateral Abandonment . 2-26CIP Construction . 2-26REHABILITATION . 2-27Pipeline Rehabilitation . 2-27Manhole Rehabilitation . 2-27Lateral Rehabilitation . 2-28Sewer Design GuideTable of Contentsiii2013
Sewer Design Guide2.72.82.92.10WASTEWATER IMPROVEMENT PLANS - STANDARDSAND PROCEDURES . 2-28General .
Sewer Design Guide Sewer Design Guide Preface 2013 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,
SECTION 6: SANITARY SEWER SERVICE LINES 6.1 Scope SEWER-26 6.2 Quality Assurance SEWER-26 6.3 Job Conditions SEWER-26 6.4 Pipe SEWER-26 6.5 Flexible Couplings SEWER-27 6.6 General SEWER-27 6.7 Trenching, Backfilling and Compaction SEWER-27 6.8 Taps SEWER-27
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