drainage basin:
An area confined by drainage divides, often having only one
outlet for discharge (catchment, watershed).
drift:
Alternative term for vegetative "debris."
eddy current:
A vortex-type motion of a fluid flowing contrary to the main
current, such as the circular water movement that occurs when
the main flow becomes separated from the bank.
entrenched stream:
Stream cut into bedrock or consolidated deposits.
ephemeral stream:
A stream or reach of stream that does not flow for parts of the
year. As used here, the term includes intermittent streams with
flow less than perennial.
equilibrium scour:
Scour depth in sand-bed stream with dune bed about which
live bed pier scour level fluctuates due to variability in bed
material transport in the approach flow.
erosion:
Displacement of soil particles due to water or wind action.
erosion control matting:
Fibrous matting (e.g., jute, paper, etc.) placed or sprayed on a
stream- bank for the purpose of resisting erosion or providing
temporary stabilization until vegetation is established.
fabric mattress:
Grout-filled mattress used for streambank protection.
fall velocity:
The velocity at which a sediment particle falls through a column
of still water.
fascine:
A matrix of willow or other natural material woven in bundles
and used as a filter. Also, a streambank protection technique
consisting of wire mesh or timber attached to a series of posts,
sometimes in double rows; the space between the rows may
be filled with rock, brush, or other materials.
fetch:
The area in which waves are generated by wind having a
rather constant direction and speed; sometimes used
synonymously with fetch length.
fetch length:
The horizontal distance (in the direction of the wind) over which
wind generates waves and wind setup.
fill slope:
Side or end slope of an earth-fill embankment. Where a
fill-slope forms the streamward face of a spill-through
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