mbeddedness
rates the degree to which rocks (gravel, cobble and
boulders) and snags are covered or sunken into the
silt, sand or mud of the stream bottom. Generally,
as rocks become embedded, the surface area available
to macroinvertebrates and fish (shelter, spawning,
and egg incubation) is decreased. Embeddedness is a
result of large-scale sediment movement and
deposition, and is a parameter evaluated in the
riffles and runs of high-gradient streams. The
rating of this parameter may be variable depending
on where the observations are taken. Observations of
embeddedness should be taken in the upstream and
central portions of riffles and cobble substrate
areas.
Stream Embeddedness Survey Ring
Standard procedures use three 60 cm diameter
randomly stream embeddedness survey hoops (rings)
with all rock sizes surveyed within these hoops. An
alternative procedure uses 30 cm diameter rings.
These are made of heavy gage stainless steel strap
material with handles.
607-001 60 cm dia. ring (set 3) 14 lbs.
607-002 30 cm dia. ring (set 3) 10 lbs.
Stream
Embeddedness Survey Grid
This method uses a standard 1 square meter survey
grid made of stainless steel wire divided into 1
square decimeter squares. Another standard size is
24 inch square with 2 inch squares providing 144
subsquares.
607-008 1 Square Meter Grid 7 lbs.
607-009 24" Square Inch Grid 10 lbs.
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