Question

using the diagram provided, identify the best location for a factory to be built to minimize the impact its runoff will have on the nearby towns.
city 1
city 2
flow of river
city 3
city 4
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Explanation:

To minimize runoff impact on towns, the factory should be placed downstream of all cities, so river flow carries runoff away from populated areas. City 4 is the only location below the other three cities relative to the river's direction.

Answer:

City 4