Grade soil, fertilize and seed as per general guidelines below.
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Dig a 12” x 12” initial anchor trench at the upstream end
(see Fig.4). If there is concentrated flow at channel entrance, it is recommended
that the initial anchor trench be made at least 12” upstream from
the pipe opening. It is also recommended to adopt measures to reduce the
velocity of flow at pipe opening.
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Dig intermittent check slots (6” deep and 6” wide) across
the channel at 25’ to 50’ intervals depending on the slope
gradient of the channel (see Fig.5).
-
Dig 6” deep and 6” wide longitudinal trenches at the top of
side slopes to anchor the blanket edges (see Fig.6).
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Dig 12” deep and 12” wide terminal anchor trench at downstream
end (see Fig.7).
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Install the first blanket in the initial anchor trench, upstream, in the
center of the channel and anchor with two staggered rows of staples at
6” spacing, backfill and compact. Do not stretch, but make sure
there is full contact between blanket and soil.
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Do not stretch' but make sure there is full contact between blanket and soil.
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In the same manner, position adjacent blankets in the initial anchor trench
overlapping the preceding blanket a minimum of 8” and anchor.
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Unroll center strip downstream.
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Unroll adjacent mats downstream in a similar fashion, maintaining a 8”
wide overlap. Anchor the overlapped area with staples at 16” to
18” spacing depending upon the flow velocity.
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For anchoring the middle of the blankets see “Staple Pattern Guide
for Channels” below.
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Secure the edges of the blankets along the longitudinal trenches on the
top of slopes with staples at 12” centers (see Fig.6).
-
Fold and secure the matting snugly into all transverse check slots. Lay
the matting in the bottom of the slot and then fold back against itself.
Anchor through both layers of blanket at 6” intervals then backfill
and compact soil (see Fig.5).
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For noncritical installations, place two staggered rows of staples at
6” spacing in lieu of check slots.
-
When blankets need to be spliced, place upstream blanket over the downstream
blanket with an overlap of at least 12”. Use two staggered rows
of staples at 6”spacing.
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Anchor, fill and compact downstream end matting in terminal anchor trench
(see Fig.7).
