If any authorized appropriation is set up pursuant to the provisions of section 7-364 and through unforeseen circumstances the completion of the project or acquisition for which such appropriation has been designated is impossible of attainment, upon recommendation of the budget-making authority and approval by the legislative body, such appropriation shall terminate and no longer be in effect.
Conn. Gen. Stat. § 7-365
(1949 Rev., S. 798.)