When dehydration is severe, the symptoms are more severe too. We will have a rapid pulse and quicker breathing. We will not need to pee, or have a small volume of dark yellow pee. Headaches will be intense, and we may feel dizziness, lethargic, or confused. If the dehydration is bad enough, we may even faint. Before things get that bad, it’s best to monitor yourself and your group for signs of dehydration. The best gauge available is urine output and volume. These two things take into account all variables (like heat, humidity, health, age, weight, exertion, etc.). Don’t worry, we’re not asking you to pee into a graduated cylinder and keep a chart of the results. A general impression is good enough. If you’re not peeing every 2-3 hours, and it’s not the normal volume for you – then you are dehydrated. It’s just as simple as that. Drink more water until your pee schedule is back to normal, and make sure you don’t overhydrate with plain water (since that can lead to our next problem, hyponatremia).