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Adaptation measure means a project, practice, or approach to mitigate or address an impact of climate change, including sea -level rise, storm surge, and flooding, including increased or recurrent flooding. Agricultural lands means those lands used for the planting and harvesting of crops or plant growth of any kind in the open; pasture; horticulture; dairying; floriculture; or raising of poultry and/or livestock. Best management practice or BMP means a practice, or a combination of practices that is determined by a state or designated area -wide planning agency to be the most effective, practical means of preventing or reducing the amount of pollution generated by nonpoint sources to a level compatible with water quality goals. Buffer area means an area of natural or established vegetation managed to protect other components of a Resource Protection Area and state waters from significant degradation due to land disturbances. Canopy tree means a tree that typically reaches 35 feet in height or taller when mature. Chesapeake Bay Preservation Area or CBPA means any land designated by the city council pursuant to Part III of the Chesapeake Bay Preservation Area Designation and Management Regulations, 9VAC25-830-70 et seq., and Code of Virginia, § 62.1-44.15:72. A Chesapeake Bay Preservation Area shall consist of a Resource Protection Area and a Resource Management Area. Construction footprint means the area of all impervious surface including, but not limited to, buildings, roads and drives, parking areas, and sidewalks and all land disturbances on the site including access areas necessary for construction of such improvements. Development means the construction, or substantial alteration of residential, commercial, industrial, institutional, recreation, transportation, or utility facilities or structures. Diameter at breast height or DBH means the diameter of a tree measured outside the bark at a point 4.5 feet above ground. Dripline means a vertical projection to the ground surface from the furthest lateral extent of a tree's leaf canopy. Fill means a material such as sand, soil, gravel, or crushed stone, which is placed in an area, often to adjust elevation or create land contouring. Freeboard is an additional amount of height above the Base Flood Elevation (BFE) used as a factor of safety (e.g., 3 feet above the BFE) in determining the level at which a structure's lowest floor must be elevated or floodproofed to be in accordance with state or community floodplain management regulations. Highly erodible soils means soils (excluding vegetation) with an erodibility index (EI) from sheet and rill erosion to or greater than eight. The erodibility index for any soil is defined as the product of the formula RKLS/T, where K is the soil susceptibility to water erosion in the surface layer; R is the rainfall and runoff; LS is the combined effects of slope length and steepness; and T is the soil loss tolerance. Highly permeable soils means soils with a given potential to transmit water through the soil profile. Highly permeable soils are identified as any soil having a permeability equal to or greater than six inches of water movement per hour in any part of the soil profile to a depth of 72 inches