The Department of Public Works shall have the following powers and duties:
(a) design, construct, excavate and maintain streets and public works improvements including but not limited to bridges, public parkways and rights-of-way, sanitary sewers and storm drains, water and sewer treatment facilities, landfills and public rights-of-way lighting facilities owned by the City;
(b) design and construct public buildings belonging to the City, except those under the jurisdiction of the Proprietary Departments and the Department of Recreation and Parks;
(c) dispose of solid waste; and
(d) perform other duties as may be assigned by ordinance, if not inconsistent with Section 514.