Kulachi is an agricultural city. The area lies at the foot of the Sulaiman Range and hence is irrigated by flood water from Sulaiman Mountains. The system of irrigation is called Rod Kohi, a system of mountain channels or hill-torrents inundating the whole valley of Damaan ("Rod" means "channel" and "Koh" means "mountain" in Persian). The Rod Kohi system based on "Kulyat Riwajat" (Fromulae and Traditions) governed the irrigation system eversince the Pathan tribes had moved into Damaan. The British officers reduced all these to writing during their Land Settlemts in the later part of nineteenth century. The Bolton Irrigation Notes of 1908 are still considered as the Bible of Rod Kohi Irrigation.