Whenever there shall be located within the bounds of any such conservancy district incorporated under the provisions of this Act, any United States military post, reservation or station, or any naval station, the board of trustees of said district are hereby authorized to enter into contracts or agreements with the appropriate authorities of the United States, permitting either party to the contract to connect with and use any conduits, channels, pipes and to use any other structures or work installed by the other party to the contract.