Physics
posted by Wing .
An average family of four uses roughly 1600 liters (about 400 gallons) of water per day. (One liter = 1000 cm3.) How much depth would a lake lose per year if it uniformly covered an area of 90 square kilometers and supplied a local town with a population of 30000 people? Consider only population uses, and neglect evaporation and so on.
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