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I live in the Arizona desert, and during the summer, despite my best intentions, I always seem to end up doing some hiking in the summer heat.

What is a good formula to figure out how much water I need to bring, so that I'm not running out before I'm done, but don't end up carrying 2 liters all the way through and back to my car?

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Having 2 extra liters you don't need is much better than the other way around... –  LBell Jan 25 '12 at 1:26
    
@LBell: I have run out before, but never more than a mile from the base area. And such times I've always been well hydrated beforehand. –  PearsonArtPhoto Jan 25 '12 at 4:37
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LBell is right: 99 times you feel like a dumb carrying 2 liters back to base. Suddenly 100th time something unexpected happens and the water saves your life. –  Tomas Feb 1 '12 at 20:16
    
Water is man's best friend. You can never have too many good friends! –  anaheim Jun 19 '13 at 7:40
    
Where exactly in the "AZ desert" are you planning on going. Some places are a lot more severe and remote than others. For example, deep in the Kofa NWR, I'd be extra careful. –  Olin Lathrop Apr 14 at 14:18
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8 Answers

up vote 17 down vote accepted

I led extended backpacking trips in Grand Canyon country for several years, and we required everyone carry at MINIMUM a gallon (almost 4 litre) per person per day -- which adds up. (Though rarely did we plan trips that did not have dependable water sources within a day's walk, meaning we would start and end the day with bellies full of water.)

Different people consume (and lose) at different rates, so the above would usually balance out in a group.

Addendum: As some have pointed out, there are varying recommendations, and even Grand Canyon National Park seems to have some difference of opinion: exhibit A, and exhibit B

Considerations such as difficulty of the terrain, whether there will be a water-source where you are going, whether you start the hike well-hydrated, what time of day you are hiking, etc all play into it. As does the consideration of more water = more weight = more energy expended = more water needed. For some people, adding 2 gallons (7.6 litre) to their pack would make it difficult for them to go anywhere...

In short, if you think you need more, take more. Cache water (if possible). Be smart. Know your limits.

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Interesting. I'll defer to your experience here, but I've usually heard 1 liter per hour recommended, so a gallon seems a bit low. –  Hartley Brody Jan 25 '12 at 2:12
    
Well, see Timothy's link, as well as this one: nps.gov/grca/planyourvisit/hiking-faq.htm#CP_JUMP_100064 and we see that even the Park has varying recommendations. I personally carry more so I have plenty to share with others in need. –  LBell Jan 25 '12 at 2:26
    
One gallon seems low to me as well. For the desert section of the PCT, most recommendations I see are to carry at least six liters, and many recommend eight plus liters. I don't know that I would feel comfortable leaving sight of civilization with only one gallon :D –  Timothy Strimple Jan 25 '12 at 4:44
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@LBell The same site also says "Drink one-half to one full quart of water or sports drink each and every hour you are hiking in the heat." At the one liter per hour mark, a gallon only lasts four hours. –  Timothy Strimple Jan 25 '12 at 4:49
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The difference could come from how we are defining "hiking in the heat" - From sunup till about 10-11 am or so, the day can be fairly pleasant in the desert, and starts cooling off again starting around 3 or 4pm. During the hottest hours, your best bet is not to hike, but find a boulder to shade up under. The devil is in the details. –  LBell Jan 25 '12 at 5:10
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Hiking in the desert? As much as you can carry! I tend to prefer packing more water than less, and especially in a desert area where if something goes wrong, your access to resupply is very limited.

You can lose up to two quarts (almost 2 litre) of water per hour hiking in the desert in middle of the day, but you can only absorb around one quart (almost one litre) per hour, so that's the minimum you should shoot for if you're planning a hike.

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Interested to know where you got the 2:1 per hour ratio - by that math, hiking in the desert is a losing prospect. –  LBell Jan 25 '12 at 1:13
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@LBell nps.gov/grca/planyourvisit/hike-smart.htm That's worst case, hiking mid-day in the desert. It's best to take shelter if you can to avoid the mid-day sun, and resume after late afternoon. It definitely can be a losing prospect... deserts scare me! –  Timothy Strimple Jan 25 '12 at 1:16
    
@Timothy: Wow, and the Grand Canyon isn't even the worst desert around... –  PearsonArtPhoto Jan 25 '12 at 4:38
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It depends a bit but I would recommend twice as much water as you would need in a cooler time of the year for a similar hike. Perhaps 3 times as much if it is particularly hot.

As best as possible, don't travel in the heat of the day.

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Apart from what has been said, your need of water also depends on what you eat. If you eat salty or sweet food, or meat, you will need more water than when eating cereals for example.

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I carry 6L in the Mojave dunes but find that I only drink 3 to 4L. I may carry as much as 8L. Better safe than sorry.

Water is very heavy, but you can always ditch gear. I pack my backpack like a lightweight hiker, so I can carry all that water without my backpack getting too heavy to be any fun. My backpack weights around 40-45 pounds with water, but it's sub 16 without it.

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You can always ditch gear - but don't ditch anything or cut corners where it's essential stuff! :-) –  berry120 Jan 8 '13 at 0:39
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@Lisa I think your answer would be more useful if you put how long you were in the desert for. Is 6L of water a single day's worth? Two? Twelve? –  theJollySin Jan 8 '13 at 14:10
    
That's per day, warmer part of the year but not deadly. –  Lisa Jul 12 '13 at 1:43
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It depends on how well hydrated you are to start with, whether or not there is a water source at the end of the day, how steep the terrain is, how much food you are eating, how you breathe (mouth or nose), how good of shape you're in, how much weight you're carrying, how hot it is, and what type of pack you are using. If you are totally hydrated before heading out, eat small meals, are in excellent physical shape, keep your pack weight under 35 pounds, use a pack with a well-ventilated back (like an external frame) so you don't overheat, breath through your nose, and lay low during the afternoon... you could easily get by on 2 liters a day, I do it all the time. On the other hand, someone in poor fitness with a 50 pound pack who is chronically mildly dehydrated, using a back-hugging pack that insulates and overheats them, breathes through their mouth, overeats big salty meals, and hikes in the afternoon heat through steep terrain... could easily drink 3 gallons or more in a day, if they have that much available.

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I recently hiked in the desert in April and drank 8 oz per half hour, which was a pint an hour. That was not enough. I felt like a dried out sponge for a couple days after, and this was only a six hour day hike. I will plan a quart an hour in the future if at all possible, so that means a gallon for every four hours out.

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I visit AZ every summer and include some hikes in the desert when I'm there.

First, don't just take water. That can lead to electrolyte loss, as actually happened to me the first year I did this. Now I dissolve some gatorade powder in the water, and I haven't had that problem since. I usually mix it 1/2 to 2/3 strength relative to what the directions say. The first thing I do when I get to AZ is to buy one of those large tubs of gatorade powder. I go thru most of it in the 10 days or so I'm out there.

I don't like carrying more than 1 gallon of water, so I plan my hikes accordingly. Depending on where exactly and the weather that day, that can be good enough for a all-day hike of 8 hours or more, or only 4 hours in some cases. In cases where I know the conditions are severe, I either plan to be out no more than 4 hours or I'm going out and back along the same route and turn around when the container gets half full.

A good example of the severe case is when I went hiking in the southern White Tank mountains west of Phoenix. (I recommend avoiding the White Tanks, too many yahoos with guns, dirtbikes, and trash everywhere, but I didn't know that at the time.) It was a hot day, even for that location in August. I drank all I could stand before leaving, and took a gallon of diluted gatorade. When that got down to 1/2 gallon, I turned around and went back to the car. I only got a few miles in, and I think the whole hike lasted only about 3 hours. I had a little liquid left when I got back to the car, which I then drank and felt about right.

Other times at somewhat higher elevations and a bit cooler temperatures, I've gone the whole day on one gallon. One example was a whole-day hike around Juniper Mesa in the Prescott NF.

So in the end it matters a lot where you're going and what the conditions are in that location on that day. For the real serious desert in the heat of summer, I'd say a gallon per 3-4 hours, then derate according to weather from there.

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One gallon for a 3 hours hike is really impressive. I think I stick to the mountains :D –  bashophil Apr 14 at 16:50
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