Aerial Crossings

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  • 7/27/2019 Aerial Crossings

    1/2

    Orange County Utilities

    STANDARDS AND CONSTRUCTION SPECIFICATIONS MANUAL

    CHAPTER 2 GENERAL REQUIREMENTS AND DESIGN STANDARDS

    Section 2112: Aerial Crossings February 11, 2011

    Section 2112

    1 of 2

    PART 1 - GENERAL

    A. Aerial crossings are allowed for potable water mains and reclaimed water mains.B.

    Pipe material shall be flanged joint ductile iron.

    C. Refer to applicable water and reclaimed water main design standards.PART 2 - LOCATION

    A. Mains shall be located within dedicated rights-of-way or utility easements.1. Right-of-way

    When installed in rights-of-way, mains shall maintain a consistent alignment with

    respect to the centerline of the road. In residential developments, mains should be

    installed on the north and west side of the right-of-ways. Exceptions shall be

    considered on a case-by-case basis. In all cases, mains shall be installed along one

    side of the road, with crossings kept to a minimum.2. Easements

    If piping is constructed within an easement, the centerline of the pipe shall be

    located within two feet of the centerline of the easement.

    a. Adjacent to right-of-way minimum 20 feet; orb. Not adjacent to right-of-way minimum 30 feet;

    PART 3 - DESIGN BASIS

    A. It shall be the responsibility of the DEVELOPER to obtain all applicable regulatorypermits. When the aerial crossing is accomplished by attachment to a bridge or drainage

    structure, the DEVELOPER shall meet all requirements of the agencies that own or havejurisdiction over such structures.

    B. Adequate support and anchoring shall be provided for pipes utilized for aerial crossings.Pilings and anchoring are to be designed by an appropriately qualified ENGINEER.

    Signed and sealed calculations and design data are to be submitted by the ENGINEER

    for approval.

    C. Flexible joints shall be designed by the ENGINEER to address expansion andcontraction of the pipe. Flexible joints shall be provided between the aerial and buried

    sections of the pipe. Calculations and design data are to be submitted by the design

    ENGINEER for approval.

    D. For aerial stream crossings, the impact of floodwaters and debris shall be considered.The bottom of the pipe shall be placed no lower than one foot above the bottom of bridge

    or three feet above the 100-year floodplain, whichever is higher.

    E. Underground valves shall be provided at both ends of the aerial crossing so that thesection can be isolated for testing or repair. The valves shall be restrained, easily

    accessible and not subject to flooding. An air release/vacuum relief valve shall be

    installed at the downstream high point of the aerial crossing.

  • 7/27/2019 Aerial Crossings

    2/2

    Orange County Utilities

    STANDARDS AND CONSTRUCTION SPECIFICATIONS MANUAL

    CHAPTER 2 GENERAL REQUIREMENTS AND DESIGN STANDARDS

    Section 2112: Aerial Crossings February 11, 2011

    Section 2112

    2 of 2

    F. Appropriate guards shall be installed at both ends of the aerial crossing to prevent publicaccess to the pipe, as shown in the STANDARD DRAWINGS.