All Works executed under the Authority of this Act in or connected with the River Thames, or the Towing-path thereof, within the Jurisdiction of the Conservators of the River Thames, shall, in addition to the Approval of such Works by the Admiralty, so far as herein-before made necessary, be executed according to a Plan to be approved of by such Conservators, and to be deposited at their Office; and such Works shall be executed and performed to the Satisfaction of the Engineer for the Time being of such Conservators ; and nothing herein contained shall extend to prejudice or derogate from the Estates, Rights, Interests, Liberties, Privileges, or Franchises of the Conservators of the River Thames, or to prohibit, defeat, alter, or diminish any Power, Authority, or Jurisdiction which at the Time of the passing of this Act the said Conservators did or might lawfully claim, use, or exercise.