New Delhi, July 29 -- The New Delhi Municipal Council (NDMC) will carry out a robotic survey and mapping exercise of sewage lines laid pre-Independence using self-propelled platforms equipped with CCTV cameras, officials familiar with the matter said, adding that it will help assess the extent of damage. The robotic drone survey will be used to identify defects of displaced sections, disjointed pipes, cracks and fissures, after which repairs will accordingly be undertaken. Meanwhile, the council is also likely to soon initiate rehabilitation work of a sewage network from Shanti Path to Satya Sadan Madhu Limaye Marg via Kautilya Marg and along Kushak Nallah. NDMC officials said that there are several old brick-barrel sewer lines, developed a...