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Tree Box Filter - Construction
Accepted construction standards and specification should be followed where
applicable. The sequence of
construction for a tree box filter is provided below. This is an
example of a proprietary version of a tree box filter system known as
Filterra™, which is sold by Americast Inc.1
Please contact
Americast Inc. to get further information on the availability of
this system and to avoid possible patent infringements (Patent#
6,277,274).
Contact:
Mr. Terry Siviter
Americast Inc.
757-439-0648 (USA)
800-999-2278
http://www.americastusa.com
Construction of a tree box
filter
(Source: Americast, Inc.)
Construction Sequence2
The
Filterra™
system
can be installed at any convenient time during the construction of the site.
However, the device is best installed after the installation of the site's
infrastructure as a drop in place device. The
Filterra™ system
should not be placed in service until the contributing drainage area has
been stabilized. If the device is installed during construction of the
site’s infrastructure, the inlet must be protected from sediment.
Follow the manufacturer’s recommendations on sediment / erosion protection.
The specification for the construction of tree box filters should state the
following: 1) the earliest point at which the runoff can be directed to tree
box filter devices and 2) the means by which this delay in use is to be
accomplished. When the tree box filter devices are made operational will
depend on a variety of unique site conditions and should be evaluated and
determined on those conditions.
Excavation2
When
the Filterra™ system
is to be used in conjunction with or as an infiltration device the
preparation of the infiltration trench below the concrete box and type of
stone used or filter fabric should conform to the construction
specifications of Infiltration trenches applicable in your area.
Placement of the concrete container must be on an acceptable base (gravel,
sand or compacted soil) to prevent the device from settling. The
container should be backfilled and compacted in the same manner as any
precast concrete structure. The under drain leaving the box and connecting
to the receiving conveyance system should be appropriately supported to
prevent deflection during backfilling operations and sealed at the
connection points to prevent any leakage.
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