2007-10-30_PERMIT FILE - C1982057 ‎(3)‎

• Permit No: C1982057
• IBM Index Class Name: Permit File
• Doc Date: 10/30/2007
• Doc Name: Turf Reinforcement Mat Design and Installation Information
• Section_Exhibit Name: Tab 20 Attachment 20-C
• Media Type: D
• Archive: No

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PERFORMANCE SPECIFICATION
AMA ~ SC250
GREEN°
The composite turf reinforcement mat (C-TRM) shall be amachine-produced mat of 70% straw/30% coconut
fiber matrix incorporated into a permanent three-dimensional turf reinforcement matting.
The matrix shall be evenly distributed across the entire width of the matting and stitch bonded between heavy
duty UV stabilized top and bottom nets with 0.50 x 0.50 inch (1.27 x 1.27 cm) openings and an ultra heavy duty
UV stabilized, dramatically corrugated (crimped) intermediate netting with 0.50 x 0.50 inch (1.27 x 1.27 cm)
openings. The middle corrugated netting shall form prominent closely spaced ridges across the entire width of
the mat. The three nettings shall be stitched together on 1.50 inch (3.81 cm) centers with UV stabilized
polypropylene thread to form a permanent three-dimensional turf reinforcement matting.
Slo a Desi n - Unve etated Cover Factors

Slope Gradient (S)
Slope Length (L) 5 3:1 3:1-2:1 z 2:1
5 20 ft (6 m) 0.0010 0.0209 0.0507
20 - 50 ft 0.0081 0.0266 `0.0574
>_ 50 ft (15.2 m) 0.0455 0.0555 0.081
Channel Design Data
Roughness Coefficients -Unvegetated
Flow Depth Manning's 'ri
<_ 0.50 ft (0.15 m) 0.040
0.50 - 2.00 ft 0.040-0.012
>_ 2.00 ft (0.60 m) 0.011
Approximate Permissible Flow Velocity
Unvegetated = 9.5 ft/s (2.9 m/s)
Vegetated =15 ft/s (4.6 m/s)
Maximum Permissible Shear Stress*
Short Duration Long Duration
Phase 1
UNVEGETATED 3.0 lbs/ftz
(144 Pa) 2.51bs/ftz
(120 Pa)
Phase 2
PARTIALLY VEGETATED 8.0 lbs/ftz
(384 Pa) 8.O lbs/ftz
(384 Pa)
Phase 3
FULLY VEGETATED 10.0 lbs/ftz
(480 Pa) 8.O lbs/ftz
(384 Pa)
Values are approximate, precise values obtained from ECMDSTM
*Performance values obtained through third party testing at the Texas Transportation Institute, Colorado State University,
and/ or Utah State University based on soil loss failure criteria not exceeding 0.50 inches (1.27 cm).
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