'Kulhs' is a local system of canal irrigation was evolved in ______.

Kuhls are traditional irrigation systems commonly found in the mountainous regions of India, particularly in the state of Himachal Pradesh. They consist of a network of canals, usually made of stone, that channel water from springs or rivers to agricultural fields. The Kuhls are an important source of water for irrigation and are closely tied to the local agrarian economy and culture. The management of water flowing in the kulhs is the responsible agreement among the villagers. It is a water harvesting system used purpose for the cultivation of the crop.