The Police Department shall have the power and duty to enforce the penal provisions of the Charter, City ordinances and state and federal law. In the discharge of these powers and duties, the members of the department shall have the powers and duties of peace officers as defined by state law. The officers and employees of the Police Department shall have the power and duty to protect lives and property in case of disaster or public calamity. The scope and extent of those emergency powers and duties and the manner of their exercise shall be prescribed by ordinance consistent with Section 231(i).