Qanat Explained

A qanat is an underground water system developed in ancient Iran roughly 3,000 years ago. Gravity has been on the payroll since.

Water flows entirely by gravity, so no pumping is needed. Vertical shafts spaced 20 to 35 meters apart allow maintenance.

Some shafts plunge straight down.

Skilled laborers dug these channels by hand using leather bags and shovels.

Most Iranian qanats run under 5 kilometers. Some near Kerman measure about 70 kilometers.

Qanat technology spread westward and eastward from Persia. Puquios appeared independently in Peru around 500 CE.

In towns, wealthier residents lived near the upper outlet where water was freshest. Downstream grew progressively more polluted.

The design resists floods, earthquakes, and wartime destruction. Because it relies on gravity alone, operating costs remain low. Gravity never invoices.