New Delhi, Oct. 23 -- Delhi water minister Parvesh Verma on Wednesday said that a state-of-the-art dredging machine from Finland will arrive in the Capital by December to aid in the desilting and dredging of Yamuna and the Najafgarh drain. The machine, a Watermaster Classic IV, is an amphibious multipurpose dredger capable of operating both on land and in water from dry ground to a depth of six metres. It can perform multiple functions such as excavation, suction dredging, piling and raking - replacing the need for several single-purpose machines, Verma said. "Cleaning of the Yamuna and Najafgarh drain that was once called the Sahibi river are the two main challenges we face. This machine will arrive in Delhi by December and we will start c...