Speaking in the southern town of Galle, Sirisena lamented that flood prevention plans laid had not been implemented in the country.
"People who oppose prevention plans are the ones who cry hoarse when the floods occur," Sirisena said.
The death toll in Sri Lanka's floods rose to 203 with 94 people still missing.
The Disaster Management Centre (DMC) said at least 629,742 people of 163,701 families had been affected by the bad weather.
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The two rivers overflowing was the main reason for severe flooding more particularly in the southern Galle and Kalutara districts.
Indian naval divers and medical teams have joined rescue efforts in Lanka's flood-hit regions.
The Indian contingent of more than 300 navy personnel was assisting in the relief, with divers searching the brackish waters and medical teams seeing patients in makeshift tents set up at shelters.
INS 'Shardul' has nearly 200 personnel on board, including specialised rescue, diving and medical teams, as well as a large amount of relief material and Gemini inflatable boats.
A third Indian naval ship arrived today, bringing relief supplies including rice, lentils, sugar, milk and blankets for the displaced.
Following India's lead in early response to Sri Lanka flood disaster, more international aid has been pouring into the country, officials said.
Sri Lankan Navy said three ships from China's People's Liberation Army Navy (PLA Navy) arrived at the Colombo Port yesterday to assist ongoing relief operations.
The three PLA Navy ships which were on a goodwill visit, subsequently focused their intentions on relief efforts to help the general public affected by inclement weather.
South Korea has decided to provide humanitarian assistance worth of USD 300,000 in the form of relief goods such as family tents, blankets and tarpaulins, which will be delivered as soon as possible.
The Maldives said the Foreign Affairs Mohamed Asim in his capacity as the Special Envoy of the President of Maldives met with his Sri Lankan counterpart Ravi Karunanayake to discuss assistance to Sri Lanka.
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