Who constructed canals?

The great canal of Darius I: 6th century BC ... so Daniel I created the first canal

Explanation:

But the world's first canal created purely for water transport is an incomparably more ambitious affair. Between about 520 and 510 BC the Persian emperor, Darius I, invests heavily in the economy of his newly conquered province of Egypt.

A fellows morton, claton boat

Explanation:

. The UK canals were originally built during the Industrial Revolution to carry cargo - long before motorways and even before trains.