Marathon runners have a saying: prehydrate, don't dehydrate. 
 
The Bushfire Bulletin No 25/01 has a useful check list: 
* Dark yellow urine: highly dehydrated, drink immediately! 
* Bright yellow urine: Still seriously dehydrated, have a drink, now! 
* Yellow urine: moderately dehydrated, have a drink. 
* Light yellow urine: almost there.  
* Clear urine: Great job. But don't get dehydrated! 
 
The Bushfire Bulletin says: drink at least 8-12 large glasses of water a day. For frontline firefighting, one litre of fluid should be taken every hour. 
 
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