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New Army App Calculates Soldier Water Needs

size0U.S. Army scientists have created a new smartphone app help commanders plan for how much water their soldiers will need on a mission.

The Soldier Water Estimation Tool, or SWET, is designed to simplify water planning, task that can be a logistical nightmare for leaders. Too much water can strain already heavy combat loads, forcing some soldiers to pack too little in favor of a lighter pack. When soldiers don't have enough water, dehydration could set in, decreasing performance and increasing the risk of serious heat illnesses.

"Water is a huge logistical problem for training and field missions," Nisha Charkoudian, a research physiologist from the U.S. Army Research Institute of Environmental Medicine, known as USARIEM, Thermal and Mountain Medicine Division, said in a recent Army press release.

"Obviously, planners do not want too much, but having too little can lead to serious problems. Dehydration exacerbates symptoms caused by heat and altitude exposure, and makes a lot of things worse, including the ability to perform physical tasks in hot and high-altitude environments."

Charkoudian worked with researchers from USARIEM and a team from the Massachusetts Institute of Technology Lincoln Laboratory to develop an app that will help unit leaders accurately predict water needs with the goal of minimizing the burden of water transport and sustaining hydration.

"Research into heat stress has been going on for over 50 years at USARIEM," Charkoudian said. “Paper doctrine provides generalized look-up tables generated from complicated equations. The app meets requests from the increasingly digital battlefield for paperless guidance that is simple, accurate, mission-specific and available in real time."

SWET is an Android-based smartphone app that acts as a decision aid that translates a complicated biophysical and physiological sweat prediction model into simple user inputs regarding the anticipated intensity of activity (low, medium, high, including example activities), three category choices of military clothing ensemble and weather conditions such as air temperature, relative humidity and cloud cover.

The SWET app has user-friendly inputs and provides the user with the amount of water required for the specified conditions in liters per hour. A separate "Mission Calculator" tab further simplifies planning by providing total amounts of water required for a given unit for a given mission duration.

Total water amounts are provided in liters, one-quart canteens, two-quart canteens and gallons.

SWET was designed for unit leaders to determine group water needs. The average amount of water needed per person does not reflect individual differences, but the model error for individuals is estimated to be small, the release states.

The new app has already undergone limited user testing with the Army Mountain Warfare School in Jericho, Vermont, where soldiers gave very positive feedback, Charkoudian said. She is looking forward to more feedback once the app goes live, to make updates and possibly explore its uses in the commercial world.

"This will be one of the first apps rolled out in the Nett Warrior platform," Charkoudian said. "I am so excited to be doing stuff that is directly helping soldiers in the field. I think that's just so cool."

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