What was Lowell's narrative regarding the Martian inhabitants and their vast construction projects?

Answer

They were desperately constructing massive waterworks to bring ice melt from the poles to their equatorial cities.

Lowell's narrative captured the public imagination by suggesting intelligent Martians were building massive irrigation systems to conserve water, moving ice melt from the poles to cities.

What was Lowell's narrative regarding the Martian inhabitants and their vast construction projects?
HistoryMarsAstronomerobservationCanal