That in any county engaging in flood control works under the provisions of article 33 of chapter 19 of the Kansas Statutes Annotated, the board of county commissioners may, by order of such board, lay out, relocate, alter, widen, vacate or construct such roads or highways, and build, alter, remove or replace such bridges or culverts, as the board of county commissioners may deem necessary or advisable in connection with such flood control works. All land required for the purposes herein stated shall be acquired by the board of county commissioners in the manner provided in Kan. Stat. Ann. § 68-114: Provided, That general obligation bonds of the county may be issued as provided in article 33 of chapter 19 of the Kansas Statutes Annotated, and the proceeds thereof used to pay for such land and the costs, expenses and other charges occasioned by operations authorized in this act; but in no event shall the aggregate of bonds issued by any such county under the provisions of article 33 of chapter 19 of the Kansas Statutes Annotated, exceed, for all purposes, the amount therein provided of one percent of the assessed valuation of the county.