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Water usage and loose of depth in lake

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An average family of four uses roughly 1200 liters of water per day. How much depth would a lake lose per year if it uniformly covered an are of 50 square kilometers and supplied a local town with a population of 40,000 people? Consider only population uses, and neglect evaporation and so on.

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The solution determines how much depth a lake would lose per year depending on water usage.

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