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2020 Sewer and Drainage Facilities Design Manual

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2020 Sewer and Drainage Facilities Design Manual 2020 CITY OF PORTLAND | BUREAU OF ENVIRONMENTAL SERVICES Sewer and Drainage Facilities Design Manual Acknowledgements Abernathy, Helena Hess, Jeremiah Parulekar, Nishant Aiona, Adrienne Hess, Randy Perde-Zundel, Dan Altman, Rachele Hickey, Matt Perez, Francisco Ashney, Dan Himes, Stephen Perez, Shawn Belston, Randy Hjorten, Susan Pfeiffer, Tom Blanco, Joe Houle, John Poletski, Don Boatman, Daniel Huard, Brad Russell, Margaret Brawley-Chesworth, Alice Irwin, Gary Ryan, Bill Brophy, Ana Jones, Doug Savage, Gregory Burger, Steven Kohlsmith, Emma Shaffner, Eric Callahan, Megan Krauter, Rodney Sheets, Julia Chang, Cathy Lai, Viola Simpson, Amy Clayton, Amber Lastomirsky, Chris Stevens, Henry Coker, Alice Lehman, Rosa Szwaya, Michael Cole, John Leis, Patrick Trujillo, Stephanie Collins, Dave Lions, Ray Wells, James Criblez, Matt Lopez, Ashley Wilson, Brandon Dunlap, Ivy Mandilag, Arnel Winkler, Bret Durshpek, Erik Martinek, Karen Wolsborn, Don Dvorak, Joe Martinez, Jenny Wood, Jim Fitch, Ben Meyer, Taryn Wu, Binhong Frogner, Rachel Nabhan, Bethany Gardner, Issac Naval, Nick Gould, Sam Nikolayev, Andrey Gualotunia, Melanie Overby, Christa Hawkins, Stephen This manual is dedicated to the hard work and commitment to service of all BES employees with special thanks to those in Engineering Services, Construction, Development Services, and the Materials Testing Lab. Sewer and Drainage Facilities Design Manual March 2020 WITH APPLIED ERRATA #1 November 2008 #2 July 2011 Prepared by the City of Portland Bureau of Environmental Services For more information Colleen Harold 503-823-5564 Table of Contents General Information ........................................................................................... 1-1 1.1 Introduction ............................................................................................................... 1-1 1.2 City's Authority to Manage and Operate the Public Sewer System .......................... 1-2 1.3 Urban Services Boundary .......................................................................................... 1-4 1.4 Relationship between this Manual and the Stormwater Management Manual ..... 1-5 1.5 Organization of this Manual ...................................................................................... 1-5 1.6 Applicability ............................................................................................................... 1-6 1.7 The Need for Standards ............................................................................................. 1-7 1.8 Manual Revision — The Process for Suggesting Changes ......................................... 1-7 1.9 Coordination with other City Bureaus ....................................................................... 1-7 1.10 Useful Contacts within the City ............................................................................... 1-7 1.11 Companion Documents and Internet Links ............................................................. 1-8 Project Delivery, Permitting, and General Procedures .................................... 2-1 Introduction ............................................................................................................... 2-2 Types of Projects ....................................................................................................... 2-2 Local Improvement ..................................................................................................... 2-2 Public Improvement ................................................................................................... 2-2 General Design Responsibilities ................................................................................ 2-3 2.3.1 BES Employees ............................................................................................................ 2-3 2.3.2 Consultant under Contract with the City .................................................................... 2-3 2.3.3 Consultant under Contract with a Permittee ............................................................. 2-4 Plan, Specification, Computation, and Other Requirements .................................... 2-5 2.4.1 Plan Requirements...................................................................................................... 2-5 2.4.2 Specification Requirements ........................................................................................ 2-5 2.4.3 Use of Standard Details and Drawings........................................................................ 2-6 2.4.4 Computation and Other Supporting Document Requirements ................................ 2-10 2.4.5 Ownership of Documents ......................................................................................... 2-10 2.4.6 Consistency ............................................................................................................... 2-11 2.4.7 BES Lacks Permitting Jurisdiction for Other City Bureaus or Outside Agencies ....... 2-11 Public Works Permits............................................................................................... 2-11 2.5.1 Sewer Connection Permits ....................................................................................... 2-11 2.5.2 Simplified Permit in Public ROW/Easements ............................................................ 2-11 2.5.3 Public Works Permit Application Requirements ....................................................... 2-12 2.5.4 Public Works Permit Process .................................................................................... 2-12 Design Variance Request ......................................................................................... 2-15 The Design Variance Process - Requesting a Change from These Standards ........... 2-15 General Design Requirements .......................................................................... 3-1 Project Service Life .................................................................................................... 3-2 Service Requirements ................................................................................................ 3-3 Service to Existing and Future Development .............................................................. 3-3 Gravity Systems versus Pumped Systems ................................................................... 3-3 Sewer Separation ........................................................................................................ 3-4 Sanitary Sewers .......................................................................................................... 3-4 Storm Drainage Facilities ............................................................................................ 3-4 Combined Sewers ....................................................................................................... 3-5 Drainage for Seeps, Springs, and Artesian Conditions .............................................. 3-6 Standard Sewer Locations ......................................................................................... 3-7 Within a Right of Way (ROW) ..................................................................................... 3-7 Within Public Easement .............................................................................................. 3-8 Obtaining Easements — Preparation, Form, and Recording .................................. 3-10 Separate Document .................................................................................................. 3-11 Eminent Domain and Condemnation ....................................................................... 3-11 Permit Project Easement .......................................................................................... 3-11 Private Easements .................................................................................................... 3-12 Drainage Reserve and Tracts ................................................................................... 3-12 Survey Requirements .............................................................................................. 3-14 Survey Standard ........................................................................................................ 3-14 City of Portland Datum ............................................................................................. 3-14 Vertical Control ......................................................................................................... 3-15 Horizontal Control .................................................................................................... 3-15 Geotechnical Investigations Requirements ............................................................. 3-15 Utility Investigation Requirements ........................................................................... 3-16 Underground Utility Location ................................................................................... 3-17 Addressing and Resolving Utility Relocation Conflicts .............................................. 3-17 Environmental Investigation Requirements ............................................................ 3-18 City Staff and Consultant Designers for City Projects ............................................... 3-18 Public Works Permit Projects ................................................................................... 3-19 Resiliency and Seismic Considerations .................................................................. 3-19 ODEQ Review of City Projects ..............................................................................
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