This answer does not mention the effects of evaporation and
infiltration, both important processes on an area that size.
HeyBub wrote:
...Answer 2.
Assume Mississippi drains the center half of the country (from Rockies to
Appalachia). That is, 1500 miles E-W, and 1000 miles N-S. Further assume
this area gets 50" of rainfall per year. Turn crank.
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