MIL-HDBK-1005/7A
Section 7: DISTRIBUTION AND TRANSMISSION
7.1
Distribution
7.1.1
System Planning. Basic data on design requirements
for the distribution system are as follows: refer to AWWA
Manual M32, Distribution Network Analysis for Water Utilities
and AWWA Manual M31, Distribution System Requirements for Fire
Protection, for additional detailed information.
7.1.1.1
Information Required . For planning distribution
systems, secure the following information:
a) Topographic Map of Area Served. Secure all data
on present and planned streets, elevations of ground level, and
all control features of area.
b) Utilities. Secure data on sewers and drains, gas
and petroleum oils and lubricants (POL) lines, steam lines,
underground electric cables, and buried tactical and
communication facilities.
c)
Quantity Requirements.
Secure gpm data at various
points.
d)
Pressure Requirements.
Secure psi data at various
points.
7.1.1.2
Design. Areas on high ground or with high pressure
requirements should have a separate high service system.
Provide for maintaining pressures with pumping, backed by
elevated storage where possible. Mains should be designed for
the maximum daily demand plus reserve capacity. Demand
projections should be based on not less than 20 years in the
future, with 50 years being preferable. Arterial mains should
form a loop when possible.
a) Storage Reservoirs.
Refer to Section 8 for
reservoir criteria.
b) Valve System. Provide shutoff valves to
sectionalize the system. According to Recommended Standards for
Water Works, valves should be located at no more than 500 feet
intervals in commercial districts and at not more than 800 foot
intervals for other districts. Where systems serve widely
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