Section 122(2) in Bangalore Water Supply and Sewerage Act, 1964
(2)A rule or regulation under this Act may be made with retrospective effect and when such a rule or regulation is made the reasons for making the rule or regulation shall be specified in a statement laid before both Houses of the State Legislature. Subject to any modification made under sub-section (1), every rule or regulation made under this Act shall have effect as if enacted in this Act.