Section 18-101. Department of parks and recreation; commissioner

a.
  Definitions. Whenever used in this title, the following terms shall have
  the following meanings:
    (1) "Commissioner" means the commissioner of parks and recreation.
    (2) "Department" means the department of parks and recreation.
    b. The commissioner may delegate to an executive officer, an assistant
  executive officer, a director of maintenance and operation  and  any  or
  all of the three deputies whom the commissioner is authorized to appoint
  authority  to  act  generally  for  or  in place of the commissioner, in
  relation to his or her powers and to perform such of the duties  of  the
  commissioner  as such commissioner shall deem necessary. Such delegation
  of authority shall be evidenced by an instrument in writing to be  filed
  in the principal office of the department.