Water for the Trail: Liters, Springs, and Sharing the Load
Groups figure out how much water each person needs for a hike, where they can refill, and how to split the weight, then feel what that means by loading a pack. It prevents one of the most common mistakes on summer trips.
How to play
- What changes how much water you need: duration, heat, elevation gain, and each person's sweat rate. As a rough guide, half a liter per hour of hiking in mild weather and more in the heat. Signs of dehydration: strong thirst, dark urine, headache (5 min).
- In groups, using the route schedule and a map with springs marked, students work out liters per person and where to refill, assuming one spring may be dry (8 min).
- Splitting the load: a liter of water weighs a kilo. Each group loads one person's water into a pack and everyone takes turns walking with it for 3 minutes around the schoolyard (7 min).
- Share-out: a backup plan if a spring is dry, and why water from an untested spring isn't guaranteed safe to drink (5 min).
Rules
- Test water goes back in the jugs or onto plants; don't dump it.
- When loading the pack, water goes close to the back and centered.
- Every calculation must use the route's actual schedule.
- No comments on how much anyone else drinks or sweats.
Variations
Easier
A short route with one spring and a guided calculation.
Standard
A full-day route with several springs and load sharing.
Harder
A summer route with an unexpected dry spring: recalculate on the go and decide whether to continue.
Adaptations
- Limited mobility: tests the load in the wheelchair or on their lap and calculates needs based on their pace.
- Back pain: tests half the load and takes charge of the calculations.
- Dyscalculia: a reference table with liters per hour already worked out for different durations.
Learning goals
- Calculate water needs for a route based on its conditions.
- Plan refill points and alternatives.
- Factor in the weight of water when packing.
Equipment for a class of 25
- topographic maps: 6
- water jugs: 6
- backpacks: 6
- calculators: 6
Teacher tip
Use the map for your actual trip and check with the park or local authorities which springs are running. The usual mistake is counting on every spring on the map as if it always had water.
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