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Floodplain means the area adjacent to a channel, river, stream, or other water body that is susceptible to being inundated by water normally associated with the 100 -year flood or storm event. This includes the floodplain designated by the Federal Emergency Management Agency. Flood -prone area means the component of a natural or restored stormwater conveyance system that is outside the main channel. Flood -prone areas may include the floodplain, the floodway, the flood fringe, wetlands riparian buffers, or other areas adjacent to the main channel. Floodway means the channel of a river or other watercourse and the adjacent land areas, usually associated with flowing water, that must be reserved in order to discharge the 100 -year flood or storm event without cumulatively increasing the water surface elevation more than one foot. This includes the floodway designated by the Federal Emergency Management Agency. Flume means a constructed device lined with erosion -resistant materials intended to convey water on steep grades. General permit means a permit authorizing a category of discharges under the CWA and the VESMA within a geographical area. HUC means hydrologic unit code. Hydrologic unit code or HUC means a watershed unit established in the most recent version of Virginia's 6` Order National Watershed Boundary Dataset unless specifically identified as another order. Impervious cover means a surface composed of material that significantly impedes or prevents natural infiltration of water into soil. Incorporated place means a city, town, township, or village that is incorporated under the Code of Virginia. Inspection means an on-site review of a project's compliance with any applicable design criteria, or an on-site review to obtain information or conduct surveys or investigations necessary in the implementation or enforcement of the VESMA and applicable regulations. Karst area means any land predominantly underlain at the surface or shallow subsurface by limestone, dolomite, or other soluble bedrock regardless of any obvious surface karst features. Karst features mean sinkholes, sinking and losing streams, caves, large flow springs, and other such landscape features found in karst areas. Land disturbance or land -disturbing activity means a manmade change to the land surface that may result in the clearing, grading, excavating, or filling of land. Land -disturbance approval means an approval allowing a land -disturbing activity to commence issued by the VESMP authority after the requirements of Code of Virginia, § 62.1-44.15:34 have been met. Large construction activity means construction activity including clearing, gradings, and excavation, except operations that result in the disturbance of less than five acres of total land area. Large construction activity also includes the disturbance of less than five acres of total land area that is a part of a larger common plan of development or sale if the larger common plan of development or sale will ultimately disturb five acres of more. Large construction activity does not include routine maintenance that is performed to maintain the original line and grade, hydraulic capacity, or original purpose of the facility. Linear development project means a land -disturbing activity that is linear in nature such as, but not limited to, (i) the construction of electric and telephone utility lines, and natural gas pipelines; (ii) construction of tracks, rights-of-way, bridges, communication facilities and other related structures of a railroad company; (iii) highway construction projects; (iv) construction of stormwater channels and stream restoration activities; and (v) water and sewer lines. Private subdivision roads or streets shall not be considered linear development projects. Page 4 of 27