Section 5A(11)(g) in West Bengal Land Reforms Rules, 1965.
(g)that where the application relates to permission for change, conversion or alteration of any land having water body, the order directing change, conversion or alteration is subject to creation of compensatory water body of equal or larger size of such water body within a period of 90 days from the date of issue of the order granting change, conversion or alteration as sought for is made.