CLARK REGIONAL WASTEWATER DISTRICT DDDEEESSSIIIGGGNNN MMMAAANNNUUUAAALLL 222000111000 CLARK REGIONAL WASTEWATER DISTRICT DESIGN MANUAL INCLUDING: DESIGN CRITERIA CONSTRUCTION SPECIFICATIONS STANDARD DRAWINGS Adopted by the Clark Regional Wastewater District Board of Commissioners By Resolution Number 1532 Adopted April 13, 2010 Effective June 1, 2010 TABLE OF CONTENTS FOR THE CLARK REGIONAL WASTEWATER DISTRICT DESIGN CRITERIA CHAPTER C1 SEWERS........................................................................................................................................................... 1 C1-1 GENERAL REQUIREMENTS .................................................................................................................................. 1 C1-1.1 Approvals .................................................................................................................................................... 1 C1-1.2 Ownership ................................................................................................................................................... 1 C1-1.3 Design......................................................................................................................................................... 1 C1-1.3.1 “To and Through Policy"............................................................................................................... 1 C1-1.3.2 General ........................................................................................................................................ 2 C1-1.3.3 Approval of Alternate Materials or Methods.................................................................................. 3 C1-1.3.4 Specialty Designs......................................................................................................................... 3 C1-1.3.5 Plans, Profiles and Record Drawings ........................................................................................... 3 C1-1.5 Siting Considerations .................................................................................................................................. 8 C1-2 INDUSTRIAL AND COMMERCIAL PRETREATMENT............................................................................................ 9 C1-3 GRAVITY SYSTEMS DESIGN CONSIDERATIONS ............................................................................................... 9 C1-3.1 Definitions ................................................................................................................................................... 9 C1-3.2 Design Period............................................................................................................................................ 10 C1-3.2.1 Service Laterals.......................................................................................................................... 10 C1-3.2.2 Collection Sewers....................................................................................................................... 10 C1-3.2.3 Trunk and Interceptor Sewers .................................................................................................... 11 C1-3.3 Design Basis ............................................................................................................................................. 11 C1-3.3.1 Design for Average Daily Flow ................................................................................................... 11 C1-3.3.2 Peak Flow................................................................................................................................... 12 C1-3.3.3 Infiltration/Inflow ......................................................................................................................... 12 C1-3.4 Design Factors .......................................................................................................................................... 12 C1-4 GRAVITY SEWER DESIGN AND CONSTRUCTION DETAILS ............................................................................ 13 C1-4.1 Minimum Size............................................................................................................................................ 13 C1-4.2 Depth......................................................................................................................................................... 13 C1-4.2.1 Minimum Depth .......................................................................................................................... 13 C1-4.3 Roughness Coefficient .............................................................................................................................. 13 C1-4.4 Slope (Minimum Velocity).......................................................................................................................... 14 C1-4.5 Alignment .................................................................................................................................................. 14 C1-4.6 Increasing Size.......................................................................................................................................... 15 C1-4.7 High-Velocity Protection ............................................................................................................................ 15 C1-4.8 Material ..................................................................................................................................................... 15 C1-4.9 Joints......................................................................................................................................................... 15 C1-4.10 Flushing................................................................................................................................................... 15 C1-5 TESTING................................................................................................................................................................ 15 C1-6 MANHOLES, MONITORING MANHOLES, CLEANOUTS, GREASE INTERCEPTORS, GREASE TRAPS AND OIL- WATER SEPARATORS .................................................................................................................................................. 15 C1-6.1 Location and Miscellaneous Requirements............................................................................................... 15 C1-6.2 Connections .............................................................................................................................................. 17 C1-6.3 Diameter.................................................................................................................................................... 17 C1-6.4 Flow Channels .......................................................................................................................................... 17 C1-6.5 Watertightness .......................................................................................................................................... 18 C1-6.7 Frames, Covers, and Steps....................................................................................................................... 18 C1-6.8 Liners ........................................................................................................................................................ 18 C1-6.9 Manhole Testing........................................................................................................................................ 18 C1-6.10 Grease Interceptors................................................................................................................................. 18 C1-7 DELETED ............................................................................................................................................................... 18 CLARK REGIONAL WASTEWATER DISTRICT i Design Criteria 04/13/2010 C1-8 DELETED ............................................................................................................................................................... 18 C1-9 SPECIAL REQUIREMENTS.................................................................................................................................... 19 C1-9.1 Required Separation between Potable Water Lines, Reclaimed Water Lines, and/or Sanitary Sewers (Rev. 10/2006) ...................................................................................................................................................... 19 C1-9.1.1 Horizontal and Vertical Separation (Parallel).............................................................................. 19 C1-9.1.2 Unusual Conditions (Parallel) ..................................................................................................... 20 C1-9.1.3 Vertical Separation (Perpendicular)............................................................................................ 20 C1-9.1.4 Unusual Conditions (Perpendicular)........................................................................................... 21 C1-9.2 Pumpout Facilities at Marinas ................................................................................................................... 21 C1-9.3 Stream Crossing ....................................................................................................................................... 22 C1-9.4 Inverted Siphons ......................................................................................................................................