Reversion of unexpended balances.
Section 3
SEC. 3. Reversion of unexpended balances.- Any balance expended at the end of the period for which authorized shall continue to be available for expenditure for the same purposes during the subsequent fiscal years until exhausted, or the work or purpose for which the appropriation was made has been completed or accomplished. In the latter case, such unexpended balance shall revert to the unappropriated surplus of the fund.