According to Lowell’s hypothesis, what was the primary function of the artificial canals he observed?

Answer

Irrigation systems built to move water from the polar caps

Lowell's Martian hypothesis suggested the canals were irrigation systems built by a dying civilization attempting to move water from the polar caps to the equatorial regions.

According to Lowell’s hypothesis, what was the primary function of the artificial canals he observed?
MarsastronomyobservationPercival Lowell