Section 31.13 - Raising or enlarging existing dams(1) If the owner of any existing dam wishes to raise or enlarge the same, the owner may apply to the department for permission so to do, but the permission granted under this section shall be in amendment of any existing franchise, license, or permit previously granted authorizing the construction or maintenance of such dam only to the extent of giving the right so to raise or enlarge such dam, and shall in no way enlarge, alter, abridge or nullify property rights, privileges or obligations as to such dam, or the maintenance or operation thereof theretofore acquired or incurred. In addition to the requirements of s. 31.05(1), (6) and (7), the owner's application shall state: (a) The year in which the dam was completed.(b) If constructed by legislative permission, a statement of the act of the legislature authorizing the same.(c) A detailed description of the dam, including the maximum height or head of water that may be maintained thereby and the kind and character of material of which the same is constructed.(d) The purpose for which such dam has been and is now used and the purpose for which it is proposed to use the same.(e) The approximate amount of hydraulic power developed thereby.(f) Such additional information of any nature whatsoever as the department may require.(2) Upon receipt of an application under this section procedure shall be had substantially as required by s. 31.06; and if the department finds that the dam, raised or enlarged or rebuilt, or rebuilt, enlarged and raised in accordance with the application, will not materially obstruct existing navigation or violate other public rights, and will not endanger life, health or property, and that the applicant has complied with s. 31.14(2) or (3), permission is hereby granted to raise or enlarge or rebuild, or rebuild, enlarge and raise the same in accordance with the application.