As Hong Kong police prepare to deploy their new water cannons at anti-government protests, the daughter of a South Korean farmer who died of injuries inflicted by a similar weapon three years ago warned that the supposedly non-lethal jets can be deadly even if officers exercise extreme caution.Baek Doraji, daughter of farmer Baek Nam-gi, called on Hong Kong police to release in full the cannons’ operational guidelines for the sake of transparency, as the city’s opposition lawmakers have…