The Cantonments Act,2006
Section 46. Civil area
(1) The Central Government may, by notification in Official Gazette, declare the civil area, in a cantonment, which is inhabited largely by civil population to be the civil area for the purposes of this Act.
(2) The Central Government may in consultation with the Board undertake, as and when required and shall undertake after every census, a review of the boundaries of the civil area in each cantonment.