According to Lowell's theory, what was the ultimate purpose of the vast, interconnected canals on Mars?

Answer

To move the remaining water from the shrinking polar ice caps to warmer equatorial regions

Lowell reasoned that Martian inhabitants constructed the canals as a desperate solution to transport the remaining water from the shrinking polar ice caps toward the warmer equatorial regions where life could still persist.

According to Lowell's theory, what was the ultimate purpose of the vast, interconnected canals on Mars?
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