November 23, Colombo (LNW): The national irrigation authorities have urged communities in parts of the Deduru Oya and Attanagalu Oya basins to brace for possible flooding, following persistent rainfall that has swollen major waterways.
According to the department, water levels in the Deduru Oya have risen to near-capacity after sustained downpours across its upper and mid-catchments. In response, spill gates at the Deduru Oya reservoir were opened overnight, releasing more than 19,000 cubic feet of water per second. Officials noted that outflow could increase further if rainfall continues at its present pace.
Areas considered most at risk include low-lying sections of Wariyapola, Nikaweratiya, Mahawa, Kobeigane, Bingiriya, Pallama, Chilaw, Arachchikattuwa and Rasnayakapura. Residents have been advised to remain alert, particularly in places where minor waterways often rise quickly during intense weather.
The department also reported widespread rainfall across the Attanagalu Oya Basin early this morning. Based on readings from hydrological monitoring stations, there is concern that parts of the Attanagalu Oya and Uruwal Oya valleys could face flooding within the next two days. Divisions that may be affected include Diwulapitiya, Mirigama, Attanagalla, Mahara, Gampaha, Minuwangoda, Ja-Ela, Katana and Wattala.
Officials cautioned that several roads traversing flood-prone zones could become waterlogged, making travel hazardous. Motorists and residents have been urged to exercise extreme caution, stay informed of updates, and avoid unnecessary movement if conditions deteriorate.
