A device or structure that reduces water velocity and provides an adequate depth of flow in a culvert to facilitate fish passage.
Bankfull Elevation
For streams with an active floodplain, it is elevation at which flooding occurs.
A transverse structural member or frame supporting spans of a bridge. Bents consist of a horizontal bent cap supported by vertical piles, drilled piers or columns. A bent with columns will include foundations of either spread footings, footings on piles, or footings on drilled piers.
Berm [Earthen]
An earthen berm is a narrow ledge or shelf as along a slope or a shoulder of a road. Berms are often used to deflect precipitation and overland surface flows to basins, ponds and other stormwater control devices.
Best Fit Alignment
Road widening design that utilizes symmetrical or asymmetrical widening alignments (or a combination of both) in order to provide a cost effective alternative that avoids and minimizes impacts to the natural and human environment.
Best Management Practices (BMPs)
Techniques that minimize water quality impacts when performing work in or around bodies of waters or jurisdictional areas. (See NCDOT Construction and Maintenance BMP Manual, February 2003).
Biological Assessment (BA)
The information prepared by another agency or the document itself which has been prepared under Section 7 of the ESA to determine whether a proposed major construction activity under the authority of a Federal action agency is likely to adversely affect listed species, proposed species or designated critical habitat.
Biological Opinion (BO)
When a Federal agency determines through a Biological Assessment or other review that a proposed action is likely to adversely affect a listed species, the Federal action agency submits to the U.S. Fish and Wildlife Service (FWS) a request for formal consultation (90 days). Following the consultation process, the FWS will prepare a Biological Opinion on whether the proposed activity will jeopardize the continued existence of a listed species. The FWS has 45 days after completion of the formal consultation to write the BO.
Blue-line stream
The term blue-line stream is short-hand for a surface water that is approximately shown on the most recent version of the 1:24,000 scale (7.5 minute) quadrangle topographic map prepared by the United States Geologic Survey (USGS). Blue-line streams are one of several sources of information that the N.C. Division of Water Quality (NCDWQ) uses when determining whether a water feature falls under the jurisdiction of the NCDWQ surface water and wetlands standards.
Borrow Areas
Sites used to gather fill material (i.e. soil, sand, and gravel) that can be used at another site during construction.
A facility with a functional purpose of moderate mobility and low to moderate access. The facility has limited or partial control of access, traffic signals, and a minimum of two travel lanes with a median. Connections are provided primarily at at-grade intersections with major and minor cross streets.
Box Culvert
A box (rectangular) shaped culvert, usually made of concrete, which conveys water flow through a roadway embankment. May also be used as a pedestrian or wildlife crossing under roadways.
Bridge Replacement Process
See Process III
Buffer Rules
Regulations with the purpose of protecting riparian buffers. These rules are described in 15A NCAC 02B of state law. Currently, buffer rules are in effect for the Neuse and Tar-Pamlico River Basins, the main stem of the Catawba River Basin, and the Randleman Reservoir subbasin.
Bureau of Indian Affairs (BIA)
See Acronym Cross Reference
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