The Rural Voice, 2004-01, Page 25fresh alit up and over
the tree row and
barn. Good design
will also moderate
and evenly
distribute more
gentle airflow
throuf,h the trees.
About 50 per cent of
the wiind should he
deflec ted up and
over the shelterbelt
and 5 0 per cent
should pass through
the can Copy of trees.
Two ro.ws of spruce
conife rs spaced
appropriately can
provide the 50/50
ratio. The trees
should be planted
50 to 100 feet
upwind .of the barn.
Shelf er belts on diluting the smell.
the dow n -wind side
of the barn create a physical barrier
to wind .and air movement which can
help cap ture dust particles and gases
from a hem. The trees absorb wind
energy arid reduce its speed near the
ground. As a result fewer dust
Dilution and dispersion
Winds aloft
Quiet zone
shelterbelt. This is
the same kind of
effect commonly
seen with snow
fencing where
snow settles down-
wind of the fencing
or trees due to
Ireduced wind
speed.
• To he -most effec-
tive for deposition
of odorous dust.
shelterbelts need to
he located upwind
and downwind of
odorous livestock
facilities. Leuty
Upwind
,Itelterhelts reduce
the quantity of dust
and odour that is
picket up by w ind
and shclteihelts
located d,rw n ind
of the facilities are essential to redu.c
wind speeds to allow settling of Ihr
odorous dusts that hay: hec„ni,
airborne.
Trees can also help reduce od,uu
when you are spreading_ manure ,r
Wind currents produced by the shelterbelt stir up the air from the barn
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particles and les, odorous gases will
be picked up by the air coming from
the Karn In the calmer air dust and
gases already caught up in the air will
be more likely to settle back to the
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JANUARY 2004 21