[pct-l] How much water to carry

[Yoshihiro Murakami]

Dear Seth

Yamamoto (2000) did various hiking experiments  in Japan, and measured
the amount of dehydration. He deduced an expression to estimate the
quantity of dehydration per time:

dehydration (gram/hour)= 5 X body weight ( kg )

Briefly,  providing 8 hours hiking, the dehydration of 50 kg body
weight person is  2,000 gram, that of 60 kg person is 2,400 gram,  ..
that of 70 kg person is 2,800 gram.

The bad effect of dehydration will appear at 1.5% dehydration  of body
weight, then, for safety, we should suppress dehydration within 1% of
body weight. Therefore, the water needed for 8 hours hiking is 1,500
gram for 50 kg person, 1,800 gram for 60 kg person,  2,100 gram for 70
kg person.

Female is  weaker than male on the dehydration. Be careful.



-- 
Sincerely
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Hiro    ( Yoshihiro Murakami  村上宣寛 )
facebook  http://www.facebook.com/completewalker
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Backpacking since 1980 in Japan, A foreign member of PCTA
JMT, 2009, 2010, 2011(half), 2012
Handbook of Hiking will be published in 2013
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