d. Projected Requirements. These requirements are computed from the most accurate
information available. They may be stored in the form of prepackaged supplies.
7. Water Consumption Profiles. Consumption rates are given as ether minimum or sustaining.
Consumption in times of water shortage or intense combat will be classified as minimum and will be
sufficient to permit a force to survive for periods up to one week. Commanders must understand that
there may be degradation in duty performance when troops are under minimum conditions for extended
periods. Water requirements for periods of one week or more will be classified as sustaining, unless
intense combat or a water shortage exists. When either of these two factors are present, the
classification returns to minimum and water discipline is exercised. Water should be provided under
sustaining conditions whenever possible.
8. Environmental Regions. See Part A of this lesson for more details about environmental regions.
a. Hot--Mean daily temperature is greater than 80F.
Tropical: Surface water is available.
Arid: Surface water sources are scarce.
b. Temperate--Mean daily temperatures range from 32F to 80€F, water sources are plentiful.
c. Cold--Mean daily temperature is less than 32F.
9. Water Consumption Planning Factors. Planning for water support begins with determining the
amount of water required. This will depend upon the battlefield environment, the expected time of
hostilities, and the size of the force. Water requirements are flexible. Some may be denied indefinitely
and some for several weeks, while others are always essential. Commanders and staff planners must use
the planning factors to determine the daily water requirements. A number of water consumption
requirements are directly related to the number of personnel in the force structure while others are
related to the type of equipment or facilities on the battlefield. Whenever actual logistics intelligence of
the theater, historical data, experience, or command planning guidance provide different or more
accurate data, logistics planners should modify appropriate consumption data as necessary. The
following is a description of a variety of water consuming factors used for planning water support for
various mission requirements.
a. Universal Unit Level Water Requirements. Universal unit level water is that which is
required by all Army units, regardless of their location in the theater or environment. Factors for
drinking, personal hygiene, and field feeding reflect average direct gallon/man/day consumption.
Factors for heat injury treatment and vehicle maintenance are per capita estimates. These requirements
include the following: