Kerala is now contemplating to seek an extension for preparing the plan after convincing the NGT of the difficulties in meeting the deadline.
A low-pressure area is expected to form over the Andaman Sea by November 29.
Under the Life Mission, 2.5 lakh houses have been provided to the beneficiaries and the scheme was continuing successfully, the Chief Minister said.
Documentary and scientific evidence suggest that sea erosion in Chellanam intensified after the construction of Kochi Sea Port in 1926.
More than 15,000 people living on the 17.5km coastal stretch in Chellanam live under seashore erosion threat almost round the year.
Kerala's coastal region could be protected from the wrath of the sea to a great extent through restoration of mangroves and other biodiversity in the region.
This package contains a two-pronged approach: Coastal conservation and improvement of infrastructure in coastal areas.
The opposition leader V D Satheesan alleged that absence of timely decisions by the last Pinarayi Vijayan government had cost the coastal folk dear.
The southernmost district, Thiruvananthapuram to Kasaragod in the northern tip, witnessed widespread uprooting of trees, water-logging and disruption of power supply since last night.
The affidavit filed by state chief secretary stated that a detailed report will be submitted before the apex court by next September after completing all actions including inspection of the sites.