MIL-HDBK-1005/7A
7.2.1
Location of Transmission Line. Transmission lines
convey water from the source to the treatment plant or to the
distribution system. This water may be treated or untreated,
depending on the location of the treatment plant. Routes should
be selected, consistent with economic considerations, to meet
the following desirable characteristics:
a)
It should use a gravity line, if head is
available.
b) It should be the shortest route from the point of
intake to point of delivery.
c) It should bypass rough or extremely difficult
terrain and be accessible for construction and repairs.
d) It should be below the hydraulic grade line but as
close to it as practicable.
e)
It should avoid dangers of landslides and flood
waters.
7.2.2
Types.
In designing transmission lines, note the
following:
a) Avoid pumping if feasible, and thus reduce
pressures on the line, as well as costs.
b) Pumping facilities may sometimes be planned for a
transmission storage location rather than at the source.
7.2.2.1
Pipelines . Gravity or pressure pipelines should be
used for transmission except when special circumstances justify
the use of aqueducts or tunnels.
7.2.2.2
Aqueducts . Aqueducts or canals under no pressure, may
be used to convey large flows when the construction is
economically justified. They are used only for very large works
or under special circumstances.
7.2.2.3
Tunnels . A tunnel of the gravity or pressure type
should be used to convey water underground, under either of the
following conditions:
a)
Where there is no other alternative route.
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