(a) As used in § 14-704(4) (Flood Protection) and § 14-704(2) (Steep Slope Protection): Any construction, reconstruction, modification, extension, expansion, or substantial improvement of structures; filling; dredging; mining; grading; paving; excavation; drilling operations; or storage of equipment or materials; land excavation; land clearing; land improvement; or any construction thereof.
(b) For all other purposes: The erection or relocation of a structure, an alteration to an existing structure that results in a change in gross floor area, or a lot adjustment.