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You are here: home > study guide topics > field sanitation > fluid replacement guidelines for warm weather training

Fluid Replacement Guidelines for Warm Weather Training
Applies to Average Acclimated Service Member Wearing Hot Weather Uniform

Posted Thursday, June 1, 2006

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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Fluid Replacement Guidelines for Warm Weather TrainingApplies to Average Acclimated Service Member Wearing Hot Weather Uniform

Fluid Replacement Guidelines for Warm Weather Training
Applies to Average Acclimated Service Member Wearing Hot Weather Uniform