Layer or facing of rock or broken concrete which is dumped
or placed to protect a structure or embankment from erosion;
also the rock or broken concrete suitable for such use. Riprap
has also been applied to almost all kinds of armor, including
wire-enclosed riprap, grouted riprap, sacked concrete, and
Engineering works with or without the construction of
embankment, built along a stream or reach of stream to direct
or to lead the flow into a prescribed channel. Also, any
structure configuration constructed in a stream or placed on,
adjacent to, or in the vicinity of a streambank that is intended to
deflect currents, induce sediment deposition, induce scour, or
in some other way alter the flow and sediment regimes of the
A flat wire cage or basket filled with stone or other suitable
material and placed as protection against erosion.
Numerical measure of the frictional resistance to flow in
a channel, as in the Manning's or Chezy's formulas.
Rough, irregular fragments of materials of random size used to
retard erosion. The fragments may consist of broken concrete
slabs, masonry, or other suitable refuse.
either perennial or intermittent form.
Sacks (e.g., burlap, paper, or nylon) filled with mortar,
concrete, sand, stone or other available material used as
protection against erosion.
Sediment bounced along the streambed by energy and
turbulence of flow, and by other moving particles.
A rock fragment whose diameter is in the range of 0.062 to 2.0
Erosion of streambed or bank material due to flowing water;
often considered as being localized (see local scour,
contraction scour, total scour).
sediment or fluvial
Fragmental material transported, suspended, or deposited by
Weight or volume of sediment relative to the quantity of
transporting (or suspending) fluid.
The quantity of sediment that is carried past any cross section
of a stream in a unit of time. Discharge may be limited to
certain sizes of sediment or to a specific part of the cross