The reciprocal of the annual probability of exceedance of a
hydrologic event (also return period, exceedance interval).
The condition of a stream or its channel with regard to stability.
A stream is in regime if its channel has reached an equilibrium
form as a result of its flow characteristics. Also, the general
pattern of variation around a mean condition, as in flow regime,
tidal regime, channel regime, sediment regime, etc. (used also
to mean a set of physical characteristics of a river).
A change in channel characteristics resulting from such things
as changes in imposed flows, sediment loads, or slope.
Alluvial channel that has attained, more or less, a state of
A formula relating stable alluvial channel dimensions or slope
to discharge and sediment characteristics.
A retaining structure consisting of vertical panels and
attached to reinforcing elements embedded in compacted
A streambank protection method consisting of a continuous
stone toe-fill along the base of a bank slope with intermittent
fillets of stone placed perpendicular to the toe and extending
back into the natural bank.
An opening in an embankment on a floodplain to permit
passage of overbank flow.
A permeable or impermeable linear structure in a channel
parallel with the bank and usually at the toe of the bank,
intended to reduce flow velocity, induce deposition, or deflect
flow from the bank.
Rigid or flexible armor placed to inhibit scour and lateral
erosion. (See bank revetment).
A natural, shallow flow area extending across a streambed in
which the surface of flowing water is broken by waves or
ripples. Typically, riffles alternate with pools along the length of
a stream channel.
Pertaining to anything connected with or adjacent to the banks
of a stream (corridor, vegetation, zone, etc.).