Upon the approval of the engineer’s report by the governing body of the city and the division of water resources, the governing body of the city, if property is to be condemned, shall proceed to exercise the power of eminent domain in accordance with Kan. Stat. Ann. §§ 26-501 through 26-516, and amendments thereto, and shall have the right to advertise for bids and enter into a contract for the improvements. Whenever a contract or agreement has been entered into by the United States army corps of engineers or any other federal agency or agencies and the city, or by a watershed or drainage district and the city, or the federal agency or agencies or a watershed or drainage district is willing to enter into the contract with the governing body of the city, for the construction of flood control improvements, the governing body of the city shall not be required to advertise for bids for the construction of the flood control works.