A CWC advisory said the west-flowing rivers in Thiruvananthapuram, Kollam, Pathanamthitta, Idukki, Kottayam, Alappuzzha and Ernakulam in Kerala were likely to rise over the next 24 hours and then, slowly fall as the rains reduced.
However, the rivers in Tamil Nadu's Kanyakumari were likely to remain in a "high flood" situation during the period, the advisory said, adding that the water level in these rivers was expected to dip as the effect of the rainfall reduced.
Similarly, the Vaigai river was likely to rise and a "significant inflow" was expected to be added to the Vaigai dam during the period, it added.
"However, as there is a sufficient cushion, the releases may not immediately be required," the advisory said.
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The CWC said the Amaravathi and Bhavani rivers and their tributaries in the Cauvery basin were also expected to receive sufficient flows, increasing the water levels in the Amaravathy, Moyar, Pilloor and Bhavanisagar dams in the Nilgiris, Coimbatore and Erode districts of Tamil Nadu.
"The lakes around Chennai are also expected to get sufficient inflows during the period between December 2 and 6," the commission said.
"The release from the Sathanur dam has to be accordingly monitored, in view of the developing situation in association with the well-marked low pressure in the Bay of Bengal which is likely to become a depression and move towards the North Tamil Nadu-South Andhra Pradesh coasts," it added.
"There is a likelihood of a rapid rise in the water levels of the Suwarnamukhi and Kalingi rivers in Chittoor and Nellore districts," the commission said.
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