MIL-HDBK-1005/7A
e)
Appurtenances.
Provide the following
appurtenances:
(1)
Access and valve chambers with their tops 6
in. above grade.
(2)
Inside ladders or manhole steps.
(3)
A screened vent above ground.
(4)
Water level indicators and alarms.
(5)
Sampling access points.
f)
Structural Design. For design criteria of
concrete underground structures, refer to NAVFAC DM-7.02,
Foundations and Earth Structures , and MIL-HDBK-1002, Structural
series.
8.3.2.3
Standpipes. The design of standpipes should be based
on the criteria given below.
a) Useful Storage Capacity. Locate the standpipes on
high ground, to obtain maximum usable storage volume above the
required static head.
b)
Height. Determine the necessary height from the
following considerations.
(1)
Capacity required.
(2) Head needed to develop the required
distribution pressure.
(3) Limitation for aviation clearance set by
military or civilian authorities.
(4)
Structural stability.
(5) Watertightness for concrete standpipes. A
special membrane is required for those subjected to heads in
excess of 50 ft
(6)
Economic considerations.
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