1. Erection of dams, the construction of which has been authorized by proper authority;

2. Uses of subaqueous beds authorized elsewhere in this title;

3. Construction and maintenance of congressionally approved navigation and flood-control projects undertaken by the United States Army Corps of Engineers, the United States Coast Guard, or other federal agency authorized by Congress to regulate navigation, navigable waters, or flood control;

4. Construction of piers, docks, marine terminals, and port facilities owned or leased by or to the Commonwealth or any of its political subdivisions;

5. Except as provided in subsection D of § 28.2-1205, placement of private piers for noncommercial purposes by owners of the riparian lands in the waters opposite those lands, provided that (i) the piers do not extend beyond the navigation line or private pier lines established by the Commission or the United States Army Corps of Engineers, (ii) the piers do not exceed six feet in width and finger piers do not exceed five feet in width, (iii) any L or T head platforms and appurtenant floating docking platforms do not exceed, in the aggregate, 400 square feet, (iv) if prohibited by local ordinance open-sided shelter roofs or gazebo-type structures shall not be placed on platforms as described in clause (iii), but may be placed on such platforms if not prohibited by local ordinance, and (v) the piers are determined not to be a navigational hazard by the Commission. Subject to any applicable local ordinances, such piers may include an attached boat lift and an open-sided roof designed to shelter a single boat slip or boat lift. In cases in which open-sided roofs designed to shelter a single boat, boat slip or boat lift will exceed 700 square feet in coverage or the open-sided shelter roofs or gazebo structures exceed 400 square feet, and in cases in which an adjoining property owner objects to a proposed roof structure, permits shall be required as provided in § 28.2-1204;

6. Agricultural, horticultural or silvicultural irrigation on riparian lands or the watering of animals on riparian lands, provided that (i) no permanent structure is placed on or over the subaqueous bed, (ii) the person withdrawing water complies with requirements administered by the Department of Environmental Quality under Title 62.1, and (iii) the activity is conducted without adverse impacts to instream beneficial uses as defined in § 62.1-10; or

7. Recreational gold mining, provided that (i) a man-portable suction dredge no larger than four inches in diameter is used, (ii) rights of riparian property owners are not affected, (iii) the activity is conducted without adverse impacts to instream beneficial uses as defined in § 62.1-10, (iv) the activity is conducted without adverse impacts to underwater historic properties and related objects as defined in § 10.1-2214, and (v) the activity is not defined as mining in § 45.1-180.