What is the British canal used for?

The canal system dates to Roman Britain, but was largely used for irrigation or to link rivers. The navigable water network in the British Isles grew as the demand for industrial transport increased.

Explanation:

The familiar pound lock which is in use today in Britain is said to have been invented by Chhiao Wei-Yo, in the year 983, in China, although the mitre gate

It was used for Hiding during war