Subject to the provisions of the Charter, and to any ordinances as are not in conflict with the grants of power made to each department in the Charter:
(a) Management. The head of each department shall have power to supervise, control, regulate and manage the department.
(b) Rules and Regulations. The head of each department shall have the power to make and enforce all rules and regulations necessary for the exercise of the powers conferred upon the department by the Charter. The board of each department under the control and management of a general manager shall have the power to make and enforce all rules and regulations necessary for the exercise of powers and the performance of the duties conferred upon that board by the Charter. Every order or resolution adopting a rule of general application to be followed by the public shall be published once in a daily newspaper and shall take effect upon publication. Those rules, when adopted by order of a general manager who is the head of a department, shall be subject to the approval of the Mayor.
(c) Acquisition of Real Property; Approval of Contracts. Subject to Section 373, any action by a department created in the Charter authorizing the acquisition or sale of real property, approving of contracts which obligate the City for a longer period of time than as provided by ordinance, or which involve consideration reasonably valued in excess of such monetary limitation as provided by ordinance, shall be taken by the head of the department by order or resolution.
(d) Police Power. No grant of power by the Charter to any department or board of City government shall be construed to restrict the power of the Council to enact ordinances under the police power of the City, except as otherwise specifically provided in the Charter.