The minimum water main pipe size shall be eight inches diameter.
Thrust blocks shall be provided at all hydrants, tees and bends.
Where undisturbed earth is not available or not likely to be available
to support the blocks, tie rods and retaining glands shall be used
as approved by the City Engineer.
All water mains shall be constructed at a depth of five feet
from final grade to the top of the water main unless otherwise approved
by the City Engineer.
Separation and protection of water mains from sewers shall comply
with the requirements of the Michigan Department of Environment, Great
Lakes and Energy (EGLE).
A. Wherever water mains cross storm sewers, sanitary sewer, or sewer
service connections:
(1) Lay the water main so that its invert is at least 18 inches above
the top of the sewer.
(2) Maintain this vertical separation for that portion of the water main
located within 10 feet horizontally of any sewer or drain crossed.
(3) Center a length of water main pipe over the sewer to be crossed with
joints equidistant from the sewer or drain.
B. When it is impossible to obtain the minimum 18 inches vertical separation,
or when it is necessary for the water main to pass under a sewer or
drain:
(1) Construct the sewer or drain of pressure pipe, conforming to the
specification for water main materials.
(2) Extend the sewer construction on each side of the crossing until
the normal distance from the water main to the sewer or drain is at
least 10 feet.
(3) As an alternate, install either the water main or sewer inside a
water main quality casing or carrier pipe for a distance of 10 feet
measured perpendicular to the sewer on each side of the crossing.
C. Where a water main must cross under a sewer:
(1) Maintain a vertical separation of minimum 18 inches between the invert
of the sewer and the crown of the water main.
(2) Support the sewer or drain line to prevent settling and breaking
either pipe.