FLOOD06399

• County: Jefferson
• Community: Buffalo Creek
• Basin: South Platte
• Title: Stream Channel Stabilization Techniques for the Buffalo Creek Reclamation Project
• Date: 8/20/1996
• Prepared For: USFWS
• Prepared By: Woodward-Clyde
• Floodplain - Doc Type: Flood Mitigation/Flood Warning/Watershed Restoration

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EROSION Z).:&tJp

EROSION CONTROL BLANKETS AND MAlTING
.1XT NOTES

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CODStnlctioa Specifications:
Site PteDaration
· Pn1Per site preparation is essential to
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ensure complete contact of Ihe
prdtection matting wilh the soil
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· T and shape area of installation.

. Remove all rocks, clods, vegetative or
o~r obstrUctions so that Ihe installed
blaink:el5, Or mats will have direct
I '.L
contaCt WI... Ihe soil.
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. Pr~ seedbed by loosemng 2" - 3" of
tOToil above final grade.

. 1Il<;O'Porate amendments, such as lime
ana fertilizer, into soilllccording 10 soil
tesk and Ihe seeding plan.

Seedi~
Seed atea ~ blanket installation for
. r
eroston control and re-vegetlltion. Seeding
after Dlat installation is often specified for
turf reiluorcemenl appIicatiOllS. When
seeding prior 10 blanket installation, all
check slol5 and other areas disturbed during
, ._,,_L.,
IDSliWlIuon must be reseeded.
Wh~ Isoil filling is specified, seed the
mattmg and the entire disturbed area after
installlltion and prior to filling the mat with
soil,

Anchorinc
U-shaP,ed wire staples., metal geotextile
stake plns or 1riangular wooden stakes can
be used 10 anchor m1lts to the ground
surface. Wire staples should be a minimum
of 11 ~uge. Metal stake pins should be
3/16" ~eter steel with a 11/2" stc:el
washer at the head of the pin. W'ue staples
8JId metal stake should be driven flush to
!he soil surlace. All anchors should be 6" -
18" long and have sufficiCl1t ground

penetration to resist PUUOUL Longer anchors
may be required for loose soils.

Insta1lation on SloDeS

. Begin althe top of the slope and
anchor ilS blanket in a 6" deep x 6"
wide lrench. BaclcfllI trench and
ramp earth fumly.

Unroll blanket downslope in Ihe direction of
the waleI flow,

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. The edges of adjacent pararaIl rolls must be
overlapped 2" to 3- and be stapled every 3
feet .

. WIleD blankets must be spiced. pla<:e '
blankets end over end ( sbingIe style) with
6" overlap. Staple through overlllpped area,
approximately 12" apart.

. Lay blaDkets loosely and maintain dircc:t
conlaet with Ihe soil - do not stretch.

. Blankets shall be sllIpled sufficienlly to
anchor b!allket and maintain contact with
the soil. Staples shall be placed down the
center and staggered wilh the staples placed
along Ihe edges Sleep slopes, 1:1102:1,
require 2 staples per squaze yard. Moderale
slopes, 2:1 to 3:1, require 11/2 staples per
sqtJ'.re yard (1 staple 3' o.c.). Gentle slopes
require 1 staple per square yard.

In~tJillatioD in channels

. Dig initial anchor trench 12" deep and 6"
wide across Ihe channel at the lower end of
the project area.

. Excavate intermittent check slots, 6" deep
1llId 6" wide across Ihe chanuel at 2S' to
30' intervals along the channel