New Delhi, July 3 -- The Delhi Jal Board (DJB) will set up 47 groundwater monitoring stations by digging up deep borewells with specialised pressure sensor-cum-monitoring devices at its facilities for increased groundwater sampling and to ensure compliance with norms, officials aware of the matter said on Thursday. The new monitoring points will be 90 metres deep and will be equipped with piezometers in facilities at Vasant Vihar, Vasant Kunj, Ashok Vihar, Punjabi Bagh, Mehrauli, and RK Puram, among other places. A senior DJB official, who did not wish to be named, said, "Delhi Jal Board (DJB) maintains 95 piezometers near its sewage treatment facilities, pumping stations and water treatment plants to monitor groundwater and any possible co...