According to Lowell's interpretation, what was the primary function of the Martian canals?

Answer

Transporting water from polar ice caps toward the equator

Lowell believed the intelligent inhabitants built the canals as vast irrigation systems to draw water from the poles and move it toward the equator where life could still persist.

According to Lowell's interpretation, what was the primary function of the Martian canals?
MarsastronomyLowellCanal