"Physiographic province" means one of the five physiographic provinces of Virginia designated as the Appalachian Plateaus, Blue Ridge, Coastal Plain, Piedmont, and Ridge and Valley physiographic provinces as identified on Figure 2 in the Overview of the Physiography and Vegetation of Virginia prepared by the Department of Conservation and Recreation, Division of Natural Heritage and dated February 2016. The Department of Environmental Quality may adjust the boundaries of a physiographic province to reflect site-specific boundaries based on relative elevation, relief, geomorphology, and lithology provided by the bank sponsor.
"Primary service area" means the fourth order subbasin in which the bank is located, as defined by the hydrologic unit boundaries of the National Watershed Boundary Dataset or the hydrologic unit system or dataset utilized and depicted or described in the bank's approved mitigation banking instrument, and any adjacent fourth order subbasin within the same river watershed.
"River watershed" means the Potomac River Basin; Shenandoah River Basin; James River Basin; Rappahannock River Basin; Roanoke and Yadkin Rivers Basin; Chowan River Basin, including the Dismal Swamp and Albemarle Sound; Tennessee River Basin/Big Sandy River Basin Complex; Chesapeake Bay and its Small Coastal Basins; Atlantic Ocean; York River Basin; and New River Basin.
"Secondary service area" means the area outside the primary service area but within the same physiographic province in which the bank is located and any adjacent physiographic province within the same river watershed.
"Tree canopy" includes all of the area of canopy coverage by self-supporting and healthy woody plant material exceeding five feet in height.
If a permit applicant purchases or uses credits from a secondary service area, the permit applicant shall:
For a mixed-use development, the tree canopy percentage required pursuant to this subdivision shall be that which is applicable to the predominant use.
The tree canopy requirements established under this subsection shall not supersede any additional requirements imposed by a locality pursuant to § 15.2-961 or 15.2-961.1.
Va. Code § 62.1-44.15:23