Qanats: A Sustainable Water Management Tool For Arid Lands
Qanats are a remarkable system for managing water without pumps and with minimal evaporation even when water is transferred over considerable distances. A mother well starts the qanat and then an underground canal set at a minimal pitch carries the water for many kilometers until it comes to the surface. Some qanats were 70 km or longer.[i] The sizes of the tunnel and wells vary widely from narrow, barely large enough to fit a person, to substantial. In less consolidated materials the access shafts may need to be much larger. The spacing of the access shafts may be 20-150 m … Continue reading