New Delhi, March 6 -- The Delhi government has decided to expand its project to install "floating pontoon barriers" at drain outfalls along the Yamuna, officials aware of the matter said on Thursday, adding that the plan will now cover 12 major drains instead of three. Floating pontoons are being installed on all 12 major drains, including Sen Nursing Home drain, Nallah No. 14, Civil Military drain, Magazine drain, Sweeper Colony Khyber Pass, Sunehri Pul and Kushak drain, Taimoor Nagar drain, Tughlaqabad drain, Najafgarh drain, Barapullah drain, and the Shahdara outfall drain, a senior government official aware of the plan said. The barriers are being deployed alongside "trash skimmers" - boats equipped with machinery to remove floating was...