Sunday, May 26, 2019

You Alone in the Maine Woods ©



“A practical guide to woods comfort, safety, and survival” You Alone in the Maine Woods, from the Maine Department of Inland Fisheries & Wildlife Information & Education.

I know I have asked you this before, but do you like reading survival manuals?  Because if you do, I have a good one for you.  First published in 1972, by the Maine’s Department of Inland Fisheries and Wildlife, it is titled, You Alone in the Maine Woods.

This manual was originally compiled and written by Recreation Safety Officer Gareth Anderson and Warden Colonel John Marsh, with the help of many wardens, guides and old time hunters.  Warden John Ford illustrated it.   

This booklet was written to provide you with information about what to do before you go out into the Maine woods and by extension any wooded wilderness area within the same general latitude as Maine.  Maine covers four degrees of latitude, from 43:05 to 47:14: other places located within those latitudes are southern France, northern Italy, Romania, Mongolia, Manchuria in northeast China, Vladivostok in eastern Russia, and the northern Japanese Island of Hokkaido1.  In addition, this manual was written to teach you the steps you should take to aid in your own rescue if you have an “unexpected adventure” in the wooded, wilder parts of the world, and to make yourself more comfortable while you wait for the searchers. 


 
Some areas in the eastern US, within the same latitude as Maine.  From Google Maps.


I have always taught the “72 hour rule” which states that, in the United States, most “misplaced” people are found within 72 hours of being reported missing.  In fact, experts note that 85% of “misplaced” persons are found alive within 12 hours and 97% are found alive within the first 24 hours of being reported missing.  The key statement is “of being reported missing”; it is very important to always tell someone when you are leaving, where you are going and when you will be back.  Never, never, never, ever change your plans without telling someone.

I like You Alone in the Maine Woods.  I like that the authors included this disclaimer in their booklet was not “a guarantee against getting lost”.  I like this statement because everyone who goes into the woods will someday become bewildered and possibly “misplaced”: hopefully, if you ever become bewildered and then “misplaced” you do not panic, because then you will be truly “lost” (for more on “misplaced” versus “lost” read, “You Are Never Lost, Only Misplaced…”, HERE). 

Another thing that I liked about You Alone in the Maine Woods was that it was originally written in 1972, with the assistance of old Maine guides and wardens, when old knowledge was still common knowledge.  This is important, because by the late 1970s and early 1980s, as exploring the outdoors became increasingly popular and more mainstream, people began to rely on expensive, hi-tech gadgets and gear, which can break, get lost or run out of batteries, at the expense of learning outdoor skills.  Also by the 70s and 80s, many of the old-time guides and wardens would have passed away.  What do you do when you are alone in the wilderness and you don’t have your gadgets, if you have never been taught how to do things the old-fashioned way?  As a bonus, the State of Maine has kept You Alone in the Maine Woods current with advances in modern gear and technology, like synthetics, light-weight waterproof fabrics and GPS, by updating and releasing ten editions with the most current one being released in 2003.

Read this manual before you trek into the woods and then carry it with you on your journeys in the wilderness.  The authors covered many different topics and designed the booklet to be a guide, to use until help arrives, if you become “misplaced”. 



The contents of You Alone in the Maine Woods, from the Maine Department of Inland Fisheries & Wildlife Information & Education.

The authors pointed out that “This manual may not contain all there is to know about survival”.  No one source can cover every situation that can occur in the wilderness, the best that you can hope for from a survival manual is that it paints with a broad brush and covers concepts, generalizations and a few specific details and tips.  You Alone in the Maine Woods, does just that.

Here are some examples of the tips that you will find in You Alone in the Maine Woods

This is your personal survival manual.  Read it thoroughly before your trip into the Maine woods, and then carry it with you when you go.


 
You Alone in the Maine Woods, from the Maine Department of Inland Fisheries & Wildlife Information & Education, page 4.


You Alone in the Maine Woods, from the the Maine Department of Inland Fisheries & Wildlife Information & Education, page 5.

“[the items in the survival kit above] These items, even in moderate amounts will help prevent hunger and create a sense of well being if you become lost.  The amount of each is up to you.  There are other things that may be added, but try to keep the package small and light at all times, so it will remain easy to carry. (page 5)”

Along with your survival kit, you have another obligation to fulfill before entering the Maine woods.  Make sure you tell someone where you are going, including a written itinerary, and when you plan to return (page 6)”

“…woodsman of old…knew that wool, even when wet, retains warmth far longer than flannel, cotton or man-made fabrics…(page 6)”



 
“The Clothing Worn by an Old Maine Guide”, from the Maine Department of Inland Fisheries & Wildlife Information & Education, page 8.

Today’s lightweight garments have a remarkable ability to withstand penetrating winds.  In addition, the better garments such as the climate control fleece ones, can handle perspiration buildup equal to or better than wool.  This moisture can amount to one and a half pints of water every 12 hours.  Trapped moisture can be a serious problem in a survival situation…(page 9)”



 
You Alone in the Maine Woods, from the Maine Department of Inland Fisheries & Wildlife Information & Education, page 10


It is a good practice to carry an extra pair of socks when traveling for a day…A dry pair of socks will feel like a million dollars if your others get wet…(page 11)”

One final rule with compass work: Believe your compass under all circumstances (unless it is obviously broken)…(page 19)”

Author’s Note: always bring two compasses, a main one and an emergency spare: compare them for peace of mind, for more on this read “Getting Lost And What To Do About It”, Circa 1915”, HERE.

These tips and many, many, more can be found in You Alone in the Maine Woods: you can download a free PDF copy HERE or you can go HERE to order a free hardcopy booklet, by emailing the Maine Department of Inland Fisheries & Wildlife Information & Education, on their “Contact Us” page.

Read it, study it, use it and most importantly enjoy it!


Notes:

1 “Maine An Encyclopedia, Latitude and Longitude” https://maineanencyclopedia.com/latitude-and-longitude/, accessed May 25, 2019

Sunday, May 19, 2019

“Survival Drill”, Updated and Explained©


 

  

Do you know what to do first, second and third, and what questions to ask, if you find yourself “misplaced” in the wilderness?  Do you know the “Survival Drill”?

 

The “Survival Drill”, created in 1972 by North Frontier Communications, is an excellent tool to help you organize and prioritize survival tasks and ask the important questions that you must ask if you are to survive.  It is a checklist of actions and questions, which includes two smaller checklists. 

 

There are three problems, with the “Survival Drill” as it was originally presented by North Frontier Communications.  First, North Frontier Communications didn’t offer much explanation of the steps of the drill.  Second, they left out an important question, which they assumed you would ask, even though it was not explicitly stated in the drill.  Third, the order of the steps of the “Unable To Walk Out” checklist doesn’t agree with the “Rule of Threes”.  Therefore, I have fine-tuned and built upon the original ideas of the writers of the North Frontier Communications by adding an additional question, reorganizing one of the checklists and explained the ideas behind the steps of the “Survival Drill”.

 

First things first, though, just what is a drill?  A drill, as in, “you know the drill…” is a checklist of steps or actions performed in a particular order, which you take in a high stress situation: a drill is similar to a “Standard Operating Procedure” or SOP.

 

The first step on the drill is “Lost”.  The word lost is used in a couple of different ways in the “Survival Drill”; at best, it means that it is too close to nightfall for you to safely walk out, even if you know where you are.  It could also mean that you do not know where you are or you are injured and in either case, you cannot rescue yourself safely.  At worst, it means that you have let your sub-conscious and its closet full of fears take control, and you have panicked.  Once you give into “woods shock” and panic, you will most likely die.  A way to control your fears is to never you the term “lost”, and instead use the word “misplaced”.  Lost is a very scary word, as lost things are not found, since, they are lost.  Misplaced things are found and if you are misplaced, you just have to wait for the searchers to find you.  For more on “lost” versus “misplaced” and on woods shock, read my article “Getting Lost And What To Do About It”, Circa 1915” found HERE.

 

North Frontier Communications addressed the issue of fear, when they wrote the following, below the drill: “REMEMBER – Fear is the only real enemy.  Searchers will be out looking for you as soon as you are missed – make things easy for them.” 

 

Step one, “Face The Fact”; you are now having and “unexpected adventure” or an “unplanned overnighter”!  You are “misplaced” so, now what are you going to do about it?

 

“Stay Cool, Sit Down, Think”: a quote from “Trainee’s Notebook MATS Survival School”, by Belmore Browne.  Photo by the Author.


After realizing and accepting that you are “misplaced”, step two is to “Stay Cool, Sit Down, Think”.  Your brain is your number one survival tool -- use it!  The next few decisions that you make might be the most important one you will ever make, remember.  Do not give into your fears and panic, the best thing you can do is to sit down and think.  Many time lost people who are scared, keep moving, walking or running, and that just their wastes time and energy and makes it harder for searchers to find them.  More recent survival experts use the acronym S.T.O.P. to describe the “Stay Cool, Sit Down, Think” stage of a wilderness emergency.


 

The Boy Scouts of America S.T.O.P. Card, picture by the Author.  For more on S.T.O.P. go HERE.


At step three, you ask yourself two very important questions and your answers to these questions will determine what you will do next.  Question one is “Are You Injured”: I added this question to the “Survival Drill”, because while it was implied it was not actually stated.  If you are injured, then your very first task, provided the situation is safe and you are not hanging from your fingers on the edge of a cliff or are almost surrounded by a wildfire, will be to perform first aid on yourself.  If you are injured, depending on the nature, location and severity of your injuries, you may be “Unable To Walk Out”.


 
How to determine how much daylight you have remaining, picture by the Author.  For more information on how to determine how much daylight you have remaining, go HERE.

 

The second question deals with how much daylight is remaining, so “Check The Time”.  Often, this very important question is ignored or forgotten by wilderness travelers.  You only have so much time before dark, more in the summer and less in the winter, and often, when by the time you accept that you are “misplaced”, it will probably be late afternoon.  It is important to remember, that you should never attempt to walkout of the wilderness when it is dark, even if you know where you are, because the risk of injury or death is very high if you do.  The authors of “Survival Drill” assume that if it is close to dark, and that means that the Sun will be down below the horizon in two hours or less, you will be “Unable To Walk Out”.  If you have enough time to walk out, without crossing the two hours until Sundown deadline, then you might be “Able To Walk Out”.

 

If you are uninjured or have only minor injuries which will not prevent you from walking and there is enough daylight remaining that you can walk out before dark, then you should proceed to the “Able To Walk Out” step.  If, on the other hand, your injuries are severe and affect your ability to move easily or there is not enough time before nightfall for you to walk out, then you should begin the “Unable To Walk Out” step of the checklist.

 

CHECK MAP – Carry a large scale map of the area if possible.  Otherwise fix the position of local rivers and roads, etc., in your mind before starting out from camp so that you have a good mental map”, “Survival Drill” by North Frontier Communications, 1972

 

Your first step in the “Able To Walk Out” checklist is to “Check the Map”.  You should always carry a map of the area that you are going to be exploring, and you should study it before you head into the wilderness.  Once you have pulled out your map, you must orient it, by turning it so that the North on the map is pointing to compass north.  This is the first half of the “Orientation” step of the checklist. 

 

ORIENTATION – Carry a compass, but you can also check direction by using a watch (point hour hand at sun; bisect angle between hour hand and “12” to find South), stars (mark direction of pole star with line on ground to provide basis for next day’s navigation), woodpeckers (they drill for grubs on South side of tree), snow (melts soonest on South-facing slopes), prevailing winds (sometimes distort growth of exposed trees)”. “Survival Drill” by North Frontier Communications, 1972

 

You should always carry a compass with you in the wilderness, and I hope that you did, as it will make orienting the map much easier.  If you did not bring a compass or yours has been lost, then you will have to determine the general directions from the movements of the Sun, which in the northern hemisphere rises in the East to Southeast and sets in the West to Northwest, depending on the season.  You could also use a traditional or digital watch or a shadow stick to find the cardinal points, North, South, East and West; for more on how to do this check back for future article on “How To Find Your Way Without A Compass”.

 

After you have oriented you map and know which way is North, South, East and West, it is time to orient yourself.  This is the second half of the “Orientation” step.  If you have a map, you can attempt to locate where you are by observing the terrain around you and finding it on the map.  If you don’t have a paper map but have a good “mental map” of the area instead, you can try to find landmarks and terrain features that you recognize.  Hopefully, you remembered to turn around and look behind you at your back trail, as you traveled into the wilderness, as this will make it easier to recognize landmarks as you try to orient yourself and as you travel back out.

 

If you are certain that, you know where you are then you can try to walk out.  With any luck you will find your way out of the woods, however you should mark your trail by blazing trees or breaking branches or pushing sticks into your trail, pointing in your direction of travel, or by arranging rocks or sticks as trail markers; in case you must return to your starting point because you are “misplaced” again.  For more on how to do this check back for future article on “Trail Marking: How To Find Your Way Back”.

 

The Rule of Threes, graphic by the Author.


But what do you do if it is less than two hours to nightfall or if you are injured and cannot walk out on your own, safely?  This is the time when knowing the “Rule of Threes” will become important to your continuing survival.  The “Rule of Threes” is a planning tool, which helps you prioritize which actions are the most critical to your survival.  The “Rule of Threes” states that you cannot survive for more than 3 Minutes without air or with severe bleeding.  You cannot survive for more than 3 Hours without shelter from a harsh environment, whether it is hot or cold, or if you are in cold or icy water.  You cannot survive for more than 3 Days without water or sleep, but you can survive for 3 Weeks without food.  The “Rule of Threes” assume that the rules above them have already been met, for example, if you have a large quantity of water, yet are bleeding severely, according to the three-minute rule, the most important action to take at that moment, is to stop the bleeding.  For more on the “Rule of Threes” go HERE.  I rearranged the steps in the “Unable To Walk Out” checklist on the “Survival Drill”, so that the steps would agree with the “Rule of Threes”.  The original “Survival Drill” had the “Unable To Walk Out” steps in this order: pick a bivouac site, light fire, prepare signals, build shelter, and prepare food, drink.  I have always taught that it is important to build a shelter before you light a fire, because you AND the fire, will need shelter from the wind, the weather, and the Sun.  The only exception to the building your shelter before you light a fire rule, is if you have been in cold or icy water, in which case you will need to get a fire lit before you become too cold to light one.

 

Since you are going to spend the night in the wilderness, it is time to “Pick Bivouac Site”.  This when the “5 W’s” of wilderness survival are important: wind, water, widow-makers, wood, and wildlife.  Wind in a survival situation can dramatically reduce your core body temperature and the primary function of a shelter is to block the wind.  Ideally, your site will have trees, rocks, or other natural features that you can use to shelter from nighttime breezes and the weather.  Water, you need water for drinking and therefore your site should be near water, but not so near that you have to worry about bugs, flooding, in the case of creeks or rivers, or wind and weather, in the case of lakes and other large bodies of water.  Widow-makers are the most dangerous of the “5 W’s” and one of the most frequently overlooked, simply because people forget to look up.  Widow-makers are dead trees or trees with large dead branches or snags stuck in their crowns that could come crashing down on you in case of a storm.  Wood, your site should offer plenty of downed wood for building a shelter or for a fire.  Fallen branches or downed dead trees are important, because in a survival situation you might not have an axe or a saw or be too badly injured to use one.  Lastly, wildlife, mostly animals will leave you alone, but selecting a bivouac site near their den, near an insect nest, on a path they frequent or near a food or water source might bring you into conflict with them.  Once in Algonquin, I was caught by nightfall and I had to camp on a portage path, that night a moose wandered down the path and kicked into tent guy-lines.  Looking back, a better plan would have been to pitch my tent in the brush besides the path.  Other things to look for in a bivouac site, would be a nearby, large open area, visible from above, where you can put out rescue signals and where the trees won’t disperse a column of smoke.  Lastly, a good shelter site should not be the near the largest tree in the area, as they are the most likely to attract lightning.

 

Your first task is to get out of the wind, the sun and the rain or the snow, so “Build Shelter”.  If it is rainy, snowy, or windy, and you have remembered to bring a poncho or a trash bag, find a natural shelter, get out of the wind and the wet and use your rain gear.  Do not be out in the wind and the wet building a shelter, when you can huddle in your rain gear and conserve scarce body heat.  For more on “Using your poncho or a trash bag as an Emergency Shelter”, go HERE and HERE.  If it is daytime in the desert, get out of the sun and the wind as soon as possible to conserve precious body fluids.  Also, in areas where it gets cold at night, remember to build an emergency bough bed, because you will lose much of your precious body heat to the ground by conduction.  For information on “Making an Emergency Bough Bed”, go HERE and HERE.  Also, for more on emergency shelters check back, as I will be publishing an article soon on how to build emergency shelters. 

 

Your next step is to “Light Fire” and for that, you are going to need kindling, tinder, fuel, and a source of ignition.  One mistake people make, beyond not bringing matches, a lighter, kindling, a candle, etc., with them is not gathering enough fuel.  You want to have all your wood gathered before it is dark, as it is difficult to gather wood in the dark and it is very easy to get hurt.  It takes a lot of wood to get through the night and a good rule of thumb is to gather what you think you need and then double or even triple that amount.  You can also measure your fire’s consumption of wood for an hour and then multiply this amount by the number of hours it will be dark.

 

Now that you have the shelter built, the wood gathered and fire going, it is time to “Prepare Food, Drink”.  Sit down, conserve energy, if you have some food you can either eat it or save it, depending on how hungry you are.  Never eat if you do not have enough water, as digestion uses up body fluids.  If you have water drink it, do not save it: if you can warm it up over your fire, warm it up.  For more on water, survival and dehydration, read my article “What is Dehydration and How Do You Avoid It?” found HERE.

 

After you have rested and had something to eat and drink and if it is still light out, “Prepare Signals”.  Remember three of anything is a signal of distress and signals must be large and stand out from the background: dark on light or light on dark or brightly colored.  The U.S. Coast Guard recommends that each letter of an SOS be 18 feet by 3 feet.  Signal fires should be in groups of three, in either a straight line or in a triangle, since one fire looks like a campout and two in a line looks like a party.

 

Tell people at camp where you are going and when you’ll be back” “Survival Drill” by North Frontier Communications, 1972

 

I hope that you told someone where you were going and when you would be back and you didn’t change your plans without telling someone, because now comes the hardest part, where you sit and “Wait For The Searchers”.  The searchers should find you in the next 72 hours, as long as you stay put, if you wander you simply make it harder for the searchers to catch up with you.  Devon O’Neill, writing in Outside online, noted that statistically most “misplaced” persons are found within 72 hours of being reported missing.  He also wrote that, according to Paul Anderson a 42-year veteran of the National Park Service who spent 11 years as superintendent of Denali National Park, 85% “misplaced” persons are found within the first 12 hours and 97% within the first 24 hours of being reported missing.  So, gather more firewood, improve your shelter, improve your signals, boil some water, and talk to the trees, but do not leave your bivouac site, help is on the way. 

 

 

Sources

 

Anderson, Gareth, Safety Officer and Marsh, Col. John F.; YOU ALONE in the MAINE WOODS, [Department of Inland Fisheries and Wildlife, Maine, 10th Edition 2003] p. 26 https://www.maine.gov/ifw/docs/aloneinmainewoods.pdf Accessed 5/17/2019

 

Browne, Belmore; The Airman’s Arctic Survival Guide, [Salty Press, 2014]

 

Garza, Dolly; Outdoor Survival Training For Alaska’s Youth: Instructors Manual, [Alaska Sea Grant College Program, University of Alaska Fairbanks, Fairbanks, Alaska, Third Printing 2005] p. 30-31

 

O’Neill, Devon “How Backcountry Search and Rescue Works”, [Outside, March 4, 2016], https://www.outsideonline.com/2059616/how-backcountry-search-and-rescue-works, Accessed 10/09/2018

 

Risk, Paul H.; Outdoor Safety and Survival, [John Wiley & Sons, Inc., New York, NY 1983] p. 284-285

 

Sunday, May 12, 2019

Water Disinfection: When is boiled, boiled enough…? ©


 

Water must be boiled at a rolling boil for how long to be disinfected?  What do you think the correct answer is?  Graphic by the Author


So, on the question above, what answer did you pick? 

 

Did you know that all of the answers above have been recommended by at least one reputable source1, and all would heat water long enough to disinfect it and make it safe to drink?  Did you also know that it takes one kilogram (2.2 pounds) of wood fuel to boil one liter (1.06 quarts) of water?  The important question then is, in a survival situation where water and fuel might both be limited, when is boiled, boiled enough?

 

In raw water, there are three kinds of pathogens that are harmful to humans: protozoa, bacteria and viruses.  Common protozoa that are harmful to humans are cryptosporidium and giardia intestinalis (also called giardia lamblia); while commonly, occurring harmful bacteria are campylobacter, salmonella, shigella and escherichia coli, and such common harmful viruses such as enterovirus, hepatitis A, norovirus, or rotavirus

 

Per the CDC (Centers for Disease Control and Prevention), boiling water is the best method to disinfect water by destroying dangerous pathogens and making it safe to drink, even when it is turbid or cloudy, or you are at a high altitude.  The CDC states that “Except for boiling, few of the water treatment methods are 100% effective in removing all pathogens.2”  The CDC suggests that prior to boiling, cloudy water should be filtered through clean clothes, or left to settle, before drawing off the clear water for boiling.

 

So what is disinfection, is it the same thing as sterilization or pasteurization?  And what exactly does potable mean?  Disinfection means the removal or destruction of harmful pathogens and is the desired result of water treatment in the field, where it is typically accomplished by boiling.  Pasteurization, is similar to disinfection, but involves lower temperatures over a longer time, than disinfection.  The goal of both disinfection and pasteurization is to create potable water, which means that the water has a minimal microbial hazard.  Sterilization is the destruction or removal of all life forms and is required for surgical purposes.3

 

In the past and still today, experts taught and still teach, that water should brought to a rolling boil for either three to five minutes, ten minutes and some even longer boiling times.  However, research by Howard D. Backer, MD in 1996, the CDC in 2009 and the World Health Organization (WHO) in 2011; have shown that this is not necessary.  Their research has shown that pathogens are killed rapidly by water hotter than 140o F (60o C).  In fact, their research shows that the time it takes to heat water on a stove or over a fire, from 131o F (55o C) to a rolling boil of 212° F (100° C) at sea level will kill all disease causing bacteria, viruses and protozoa, and therefore disinfect the water.  Because of the difference between the higher standard for sterilizing water for surgical purposes and making water potable by disinfection or pasteurization, both the CDC and the WHO, now agree that boiling water for drinking purposes for ten minutes is unnecessary; and in fact, it is a waste of time, fuel and water.

 

The Backpacker’s Field Manual by Rick Curtis stated that water temperatures above 160° F (70° C) will kill all disease-causing organism within 30 minutes and at temperatures above 185° F (85° C), pathogens will die in few minutes4.  The REI store, in their online camping skills web site, notes that the most heat-resistant pathogen is the Hepatitis A virus and it is believed Hepatitis A will be killed in less than 1 minute when water is heated to 208°F (98°C)5.  In addition, according to the CDC6, heating water to rolling boil water for one minute has “high effectiveness in killing” protozoa such as Cryptosporidium, Giardia intestinalis (also called Giardia lamblia), bacteria like Campylobacter, Salmonella, Shigella and E. coli, and viruses such as enterovirus, hepatitis A, norovirus, or rotavirus

 

 An example of a rolling boil.  Video by the Author


 

While most pathogens in water are killed at temperatures well below the boiling point of water, a rolling boil is the only easily recognizable visual clue to the temperature of water without using a thermometer.  For an example of a rolling boil, see the video above.

 

To be on the safe side, because of the heat resistance of the Hepatitis A virus, the CDC recommends heating water to a rolling boil for one minute, and for an additional three minutes at elevations above 2,000 meters (6,562 feet), to insure that the water has remained hot enough, for long enough, to destroy any dangerous pathogens.  Similarly, the National Wilderness Conference advocates bringing water to a rolling boil for one minute at sea level and boiling it for an additional one minute for every 1,000 feet (305 meters) above sea level, to ensure that dangerous pathogens are destroyed.

 

Table 1    Pasteurization Temperature and time
Temperature           Time Required to Achieve Pasteurization
                                                                         (seconds)
162o F or 72o C                                                    15.0
192o F or 89o C                                                    1.0
194o F or 90o C                                                    0.5
201o F or 94o C                                                    0.1
205o F or 96o C                                                    0.05
212o F or 100o C                                                  0.01
Adapted from: “Effect of Heat on the Sterilization of Artificially Contaminated Water”, Table 1, Pasteurization of Grade A Milk, by Howard D Backer


 

The CDC recommends the additional three minutes of boiling time because, at sea level the boiling point of water is 212o F (100o C), however, as elevation increases, atmospheric pressure decreases and water boils at lower temperatures.  For every 500-foot (153 meter) increase in elevation, the boiling point of water decreases by just under 1o F or approximately .5o C.  For this reason, the CDC recommends boiling water to a rolling boil for an additional three minutes at altitudes greater than 2,000 meters (6,562 feet).  It will be noticed, that the National Wilderness Conference is more cautious than the CDC, as it advocates bringing water to a rolling boil for an additional minute for each 1,000-foot (305 meters) increase in elevation above sea level.  These additional minutes of rolling boiling time at higher altitudes are intended to ensure that even at these higher elevations, enough boiling time is achieved to ensure the destruction of any pathogenic organisms in the water. 

 

Table 2    Effect of elevation on the boiling point of water       
Elevation feet                                               Boiling Point
Sea level                                                          212o F or 100oC
2,000 feet        (610 meters)                            208o F or 98oC
5,000 feet        (1,524 meters)                         203o F or 95o C
7,500 feet        (2,286 meters)                         198o F or 92o C
10,000 feet (3,048 meters)                              194o F or 90o C
14,000 feet (4,267 meters)                              187o F or 86o C
19,000 feet (5,791 meters)                              178o F or 81o C
29,035 feet (8,850 meters) Everest Summit   162o F or 72o C

 

Water cannot become any hotter than 212°F (100°C) and remain in a liquid state.  To continue to heat water once it has reached the boiling point, in excess of one minute at low elevations and an additional three to six minutes at elevations above 2,000 meters (6,562 feet), merely wastes fuel, water and time; all of which might be in short supply in a survival situation.  So boil your water only as long as the CDC recommends or if you prefer to be extra cautious, use the National Wilderness Conference’s recommendation, and then your water will be boiled enough.

 

 

Notes

 

1 Choice a) is the recommendation from the CDC, 2007.   Choice b) is both an old rule, first recommended in The Survival Book, 1959 where they recommended that you boil water at a rolling boil for 2 minutes at sea level, later in Survival FM 21-76, 1986; and it is currently the recommendation from the National Wilderness Medical Conference (from a personal correspondence with Joe Alton, MD, August 2018).  Choice c) this is a recommendation from a number of sources, from Survival: Land, Sea, Jungle, Artic, 1944, which recommended boiling water for 3 minutes; to How To Stay Alive In The Woods, 1956, and Down but not Out, 1970, both of which recommended boiling water from 3 to 5 minutes.  Choice d) is the recommendation of the University of Alaska, “Remote Travel Safety Guide”, 2003.

 

2 “A Guide To Drinking Water Treatment and Sanitation for Backcountry & Travel Use”, CDC

 

3 Sterilization for surgical purposes requires that the water and the items to be sterilized, be brought to a rolling boil for 15 to 20 minutes [Sharon Greene-Golden, Dr. M. Baskaran Selvapathy, August Eduard Martin].

 

4 The Backpacker’s Field Manual, Rick Curtis

 

5 Water Treatment for International Travel, T. D. Wood,

 

6 A Guide to Drinking Water Treatment and Sanitation for Backcountry & Travel Use, CDC 

 

 

Sources

 

Angier, Bradford; How To Stay Alive In The Woods, [Collier Books, New York, NY; 1956] p. 91

 

Backer, Howard D.; “Effect of Heat on the Sterilization of Artificially Contaminated Water”, [Journal of Travel Medicine; 1996] p. 3:1-4 https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1708-8305.1996.tb00686.x, Accessed 4/18/2018

 

Backer, Howard D.; “Field Water Disinfection”, https://aneskey.com/field-water-disinfection/, Accessed 4/23/19

 

CDC, “A Guide to Drinking Water Treatment and Sanitation for Backcountry & Travel Use”, [2009] http://www.cdc.gov/healthywater/drinking/travel/backcountry_water_treatment.html, Accessed August 31, 2015

 

Curtis, Rick; The Backpacker’s Field Manual, http://www.princeton.edu/~oa/manual/water.shtml, Accessed August 31, 2015

 

Green-Golden, Sharon; “Boiling: The Answer to High-level Disinfecting of Surgical Instrumentation in a Village of a Third World Country”, [2009] https://www.iahcsmm.org/images/News/Fellow_Papers/FellowshipPaper_SharonGrGolden__2009.pdf, Accessed May 3, 2019

 

Martin, August Eduard; Pathology And Treatment Of Diseases Of Women, [Rebman Company, New York, NY; 1912], p. 41 https://books.google.com/books?id=xxR50f7ST7wC&printsec=frontcover&dq=%22Pathology+and+treatment+of+diseases+of+women%22&hl=en&sa=X&ved=0ahUKEwjjgZfOioDiAhUiUt8KHV1jCaYQ6AEIKjAA#v=onepage&q=%22Pathology%20and%20treatment%20of%20diseases%20of%20women%22&f=false, Accessed May 3, 2019

 

Nesbitt, Paul H., Pond, Alonzo W. & Allen, William H.; The Survival Book, [D. Van Nostrand Company Inc., Princeton, NJ; 1959] p. 172

 

RCAF Survival Training School Staff, Down but not Out: CFP 217, [Maracle Press Ltd., Ottawa; 1970] p. 121

 

Selvapathy, Dr. M. Baskaran; “Sterilization”, [S.R.M.Medical College Hospital] http://www.srmuniv.ac.in/sites/default/files/files/STERILIZATION.pdf, Accessed May 3, 2019

 

Survival: Land, Sea, Jungle, Artic, [The Infantry Journal, Washington D.C.; 1944] p. 24

 

Survival FM 21-76, [Headquarters Department Of The Army, Washington D.C. 1986] p. 5-13

 

University of Alaska Risk Management Team, “Remote Travel Safety Guide” [University of Alaska, Fairbanks, Alaska; 2003] p. 7 https://www.alaska.edu/risksafety/download/RemoteTravelSafetyGuide.pdf, Accessed 4/23/19

 

WHO, “Technical Brief, Boil Water, WHO/FWC/WSH/15.02”, [2011] http://www.who.int//water_sanitation_health/publications/2011/dwq_guidelines/en/, Accessed August 31, 2015

 

Wood, T. D.; “Water Treatment for International Travel”, http://www.rei.com/learn/expert-advice/water-treatment-international.html#Boiling, Accessed September 30, 2015