The Central Water Commission (CWC) today warn that heavy rainfall due to Cyclone Ockhi might trigger a rapid rise in the water level of the rivers in Tamil Nadu and Kerala. <br/>'<br/>A CWC advisory issued in New Delhi today said the west-flowing rivers in Thiruvananthapuram, Kollam, Pathanamthitta, Idukki, Kottayam, Alappuzzha and Ernakulam in Kerala are likely to rise over the next 24 hours and then, slowly fall as the rains reduced.<br/>'<br/>However, the rivers in Tamil Nadu's Kanyakumari are 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.<br/>'<br/>The Papanasam and Manimutharu dams in Tamil Nadu were likely to get heavy inflows due to the rainfall for the next 12 to 24 hours. <br/>'''''''<br/>