A flow path (sometimes artificial) that carries significant volumes of floodwaters during a flood.
The area along both sides of a bayou or creek including the main channel that has the strictest regulations on it because it is the area that is needed to move the 1% flood downstream and out of the homes or businesses that it may have flooded. Back
the river channel and the adjacent land area needed to carry the 100-year flood without an increase to the water surface elevations of the river more than one foot at any one point.
a canal constructed to lead flood waters from the middle and lower reaches of a river to another river or directly to the sea
a large channel built to divert flood water from invading a city
The river channel and adjoining lands indicated on the Floodway/Floodplain Maps, that would provide the pathway for flood waters in the event of a flood of a magnitude likely to occur once in one hundred years. This land is dedicated as environmental reserve when subdivision over .8 hectares (2 acres) occurs.
the channel and that portion of the floodplain adjacent to a stream or watercourse which is needed to convey the anticipated existing 100-year frequency flood discharge with no more than a 0.1 flood increase in stage due to any loss of flood conveyance or storage and no more than a ten percent increase in velocities. In some cases, the floodway may include that portion of the floodplain containing 90% of the floodplain storage volume. Floodways can be calculated based on either existing or future land use runoff condition.
Part of the floodplain, centered on the stream, that will convey most of the flow during overbank flooding events.
The channel of a river or other watercourse plus any adjacent floodplain areas that must be kept free of encroachment so that the “100-year” flood discharge can be conveyed without increasing the water surface elevation more than a designated amount. The floodway is intended to carry the deep and fast-moving water.
The area regulated by Federal, state, or local requirements to provide for the discharge of the base flood so the cumulative increase in water surface elevation is no more than a designated amount (not to exceed one foot as set by the National Flood Insurance Program) within the 100-year floodplain.
The channel of a river or stream and those parts of the adjacent floodplain adjoining the channel that are required to carry and discharge the base flood.
a term similar to floodplain although has been used to denote the path of floodwaters particularly when the floodplain has been developed and is no longer evident.
A part of the flood plain, otherwise levied, reserved for emergency diversion of water during floods. A part of the flood plain which, to facilitate the passage of floodwater, is kept clear of encumbrances. The channel of a river or stream and those parts of the flood plains adjoining the channel, which are reasonably required to carry and discharge the floodwater or floodflow of any river or stream..
The floodway is the river channel or over flow route plus any adjacent floodplain areas which are needed to carry the excess waters of the Base Flood (100-Year) without substantial increases in the flood height. Fully Urbanized Conditions. In the context of a drainage study, the water shed or drainage area of a stream is considered to be completely developed, i.e. all land is assumed to be functioning in it's ultimate use. Other descriptions include: Fully Developed, 100 per Cent Urbanized, Ultimate Development or Land Use, and Maximum Development.
The normal stream channel and that adjoining area of the natural floodplain needed to convey the waters of a regional flood while causing less than one foot increase in upstream flood elevations.
The channel of a watercourse and portion of the adjacent floodplain that is needed to convey the base or 100-year flood event without increasing flood levels by more than one foot and without increasing velocities of flood water.
The channel of a river or stream and those portions of the flood plains adjoining the channel which are reasonably required to efficiently carry and discharge the peak flow of the regulatory flood of any river or stream.
A channel designed to carry flows in excess of the underground drain capacity.
The channel of a watercourse and those portions of the flood plain adjoining the channel, which must be reserved in order to discharge the 100-year flood waters or flood flows and so that confinement of flood flows to the floodway area will not result in substantially higher flood levels and flow velocities. Category: Community Development
The channel of a river, watercourse or intermittent watercourse and the adjacent land areas that must be reserved in order to discharge the base flood without increasing the water surface elevation.