That is so, cool. I never heard of these before, but if I'm reading it right, they tell anyone who sees them that if the water level is this low, beware. Very neat.
That is so, cool. I never heard of these before, but if I'm reading it right, they tell anyone who sees them that if the water level is this low, beware. Very neat.
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That is so, cool. I never heard of these before, but if I'm reading it right, they tell anyone who sees them that if the water level is this low, beware. Very neat.