New Delhi: In a move to rejuvenate Yamuna, Delhi govt has started the process of conducting detailed topographical and bathymetric surveys along the river from Palla in north Delhi to Jaitpur in south Delhi before taking up large-scale dredging work. The topographical survey will map the land, riverbanks and floodplain, while the bathymetric survey will measure the depth and shape of the riverbed underwater.An official said that through the exercise, govt wants to create a comprehensive map of the river and its surrounding areas, including the depth of the river, the contours of the riverbed, floodplain conditions and existing structures, to help officials determine where and how dredging should be carried out.The survey by Irrigation and Flood Control Department will show a detailed picture of what exists on the ground and under the water before any major excavation is undertaken. The information will help identify areas where the riverbed has changed, where sand deposits have accumulated and where dredging may be required.“The survey will map embankments, buildings, compound walls, fencing, hutments, high-tension lines and electricity poles, plantations and nurseries, roads, cart tracks, drains, islands and other physical features. It will also identify places of worship, ancient monuments, culverts, foundations of overhead power lines and other structures in and around the river. Such features beyond 100 metres of either bank will also be covered,” said an official.Yamuna rejuvenation involves activities like cleaning the river, expanding sewage-treatment capacity, intercepting drains and improving the riverfront.The survey will measure the river at regular points to understand how wide and deep it is and how its shape changes from the point it enters Delhi till the point it exits the capital. The exercise will also compare the present condition of Yamuna with earlier surveys using old drawings, which will help identify changes in the river’s course and topography. By establishing the existing depth, floodplain contours and location of structures, the govt will have a clear basis for deciding where dredging can be undertaken and how the work can be executed without damaging existing infrastructure or disturbing the river’s flow.“The survey work will be regularly monitored. The agency which will be engaged for carrying out the survey will have to submit daily work schedules with exact locations, weekly level sheets and fortnightly progress reports. The survey agency will also be responsible for ensuring that the work does not create unnecessary pollution, dust, noise or inconvenience to nearby residents and road users. It will also have to follow directions issued by the National Green Tribunal and Delhi Pollution Control Committee,” said an official.
