MIL-HDBK-1005/7A
c) Storage. Plot a mass curve of t he direct period
on record and graphically determine the storage required on the
basis of the desired net unit yield. From the unit yield and
storage data, determine the area of catchment and the total
storage required.
4.7
Nonpotable or Salt Water Systems
4.7.1
Utilization
4.7.1.1
Waterfront Fire Protection Cooling and Flushing Water .
Separate nonpotable water supplies should be provided for active
waterfront facilities. At active and repair berths and
drydocks, cooling, flushing and fire protection requirements
should be met using nonpotable fresh or saltwater supplies.
Only one nonpotable system should be provided, and it should
meet the requirements of the MIL-HDBK-1025 and MIL -HDBK-1029
Series. At inactive berths, salt or nonpotable water should be
used, when available, for fire protection; if not available,
potable water should be used. Nonpotable water supplies should
be designed to preclude any possible contamination of potable
water supply sources or systems. Saltwater systems, including
distribution mains, should not be placed within a fresh water
aquifer, as any leaks would contaminate the aquifer.
4.7.1.2
Condenser or Cooling Water. Use nonpotable systems
for cooling and similar industrial uses when the quality of
water is not a critical factor.
4.7.1.3
Demineralization or Distillation . Use nonpotable
water for intake and waste sections of demineralization or
distillation systems. The potable portion of such systems
should be completely separated from nonpotable sections.
4.7.2
Precautions. Special precautions for nonpotable or
saltwater systems are discussed below.
4.7.2.1
Cross Connections . Refer to AWWA Manual M14,
Recommended Practice for Backflow Prevention and Cross-
Connection Control.
4.7.2.2
Elevated Storage Tanks . For nonpotable supply storage
tanks, use air gaps to prevent polluting the potable water
system. Every inlet from the potable water system into the
tanks should be placed at least 6 in. or two times the pipe
37
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