City Waterways Dredged for Flood Prevention

The Water Resources Department (WRD) in Chennai has concluded the initial phase of monsoon desilting and is now concentrating on dredging estuaries. This critical work aims to clear sand deposits and enhance the flow of floodwater from Pudhupattinam to Pazhaverkadu into the sea, bolstering flood mitigation efforts.

The department initiated waterway clearing and waste removal in Chennai, surrounding districts, and Cuddalore in September, with an expenditure of ₹42 crores. The focus remains on maintaining waterways, spanning 528.44 km across five districts, including 104.74 km within Greater Chennai Corporation limits, until the end of December.

Major rivers and their sea confluences are vital for floodwater management. Consequently, WRD is actively dredging estuaries to improve flood discharge capacity. For instance, 17 works are underway along the Cooum River, with five machines deployed to dredge its estuary and maintain an opening of up to 250 meters.

Seasonal dredging, guided by National Institute of Ocean Technology recommendations, ensures tidal exchange, biodiversity, and flood discharge. Works are ongoing in Muttukadu and Pazhaverkadu estuaries to deepen and widen them for efficient floodwater release. In Adyar River, dredged sand is utilized for beach nourishment.

While desilting progresses at seven locations along the South Buckingham canal, residents note that water hyacinth still needs clearing in some sections. Preparations are also being made to dredge the Ennore estuary, and vulnerable sea wall portions along the Ennore Expressway are slated for repair.