Fluid Replacement Guidelines for Warm Weather Training

Applies to Average Acclimated Service Member Wearing Hot Weather Uniform

HEAT CATEGORY		WBGT INDEX DEGREES F	EASY WORK		MODERATE WORK		HARD WORK
HEAT CATEGORY		WBGT INDEX DEGREES F	WORK/ REST MIN	WATER INTAKE QT/HR	WORK/ REST MIN	WATER INTAKE QT/HR	WORK/ REST MIN	WATER INTAKE QT/HR
1		78-81.9	NL	1/2	NL	3/4	40/20	3/4
	2 (GREEN)	82-84.9	NL	1/2	50/10	3/4	30/30	1
	3 (YELLOW)	85-87.9	NL	3/4	40/20	3/4	30/30	1
	4 (RED)	88-89.9	NL	3/4	30/30	3/4	20/40	1
	5 (BLACK)	> 90	50/10	1	20/40	1	10/50	1

The work/rest times and fluid replacement
volumes will sustain performance and hydration for at least 4 hours of work in
the specified heat category. Individual water needs will vary � 1/4
quart/hour.
NL= no limit to work time per hour.
Rest means minimal physical activity
(sitting or standing) accomplished in shade, if possible.
CAUTION: Hourly fluid intake should not
exceed 11/4 quarts.
Daily fluid intake should not exceed 12
liters.
Wearing body armor adds 5° F to WBGT Index.
Wearing all MOPP overgarments adds 10° F to
WBGT Index.

EASY WORK

MODERATE WORK

HARD WORK

Weapon Maintenance
Walking hard surface at 2.5 mph, with a 30 pound load
Guard Duty
Marksmanshp training
Drill and cermony

Walking loose sand at 2.5 mph, no load
Walking hard surface at 3.5 mph with a 40 pound load
Calisthenics
Patrolling
Individual movement techniques such as low crawl, high crawl
Defensive position construction

Walking hard surface at 3.5 mph with a 40 pound load
Walking on loose sand at 2.5 mph with load
Field assaults

Source: FM 21-10 Field Sanitation

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