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

PERFORMANCE SPECIFICATION
NORTH
~ P550
The composite turf reinforcement mat (C-TIUVI) shall be amachine-produced mat of 100% UV stabilized
polypropylene fiber matrix incorporated into apermanentthree-dimensional turf reinforcement matting.
The matrix shall be evenly distributed across the entire width of the matting and stitch bonded between the
bottom and middle ultra heavy duty UV stabilized nettings with 0.50 x 0.50 inch (1.27 x 1.27 cm) openings and
then covered by an ultra heavy duty UV stabilized nettings with 0.50 x 0.50 inch (1.27 x 1.27 cm) openings. The
middle, dramatically corrugated (crimped) netting shall form prominent closely spaced ridges across the entire
width of the mat. The three nets 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.
~,,._„ r,e~;R„ rata _ iTnve~etated Cover Factors
J1V c. / -- - -
Slope Gradient (S)
Slope Length (L)
5 20 ft (6 m) 5 3:1
0.00045 3:1-2:1
0.0145 Z 2:1
0.0425
20 - 50 ft 0.0173 0.0305 0.0495
z 50 ft (15.2 m) 0.0345 0.0465 0.0565
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Channel Design Data
Roughness Coefficients - Unvegetated
Flow Depth Manning's'n
5 0.50 ft (0.15 m) 0.041
0.50-2.OOft 0.040-0.014
z 2.00 ft (0.60 m) 0.013
Maximum Permissible Shear S tress
Short Duration Long Duration
Phase 1
UtJVEGETATED 4.0 lbs/ft2
(191 Pa) 3.251bs/ft2
(156 Pa)
Phase 2
PAxTiALLY VEGETATED 12.0 lbs~/ftz
(576 Pa) 12.0 lbs/ftz
(576 Pa)
pie 3
FULLY VEGETATED 14.0 lbs/ftz
(672 Pa) 1201bs/ftz
(576 Pa)
Approximate Maximum Flow Velocity
Unvegetated =12.5 ft/s (3.8 m/s)
Vegetated = 25 ft/s (7.6 m/s)
Values are approximate, precise values can be obtained using ECMDST"'
*Performance values obtained through third patty testing at the Texas Transportation Institute, Colorado State University,
and Utah State University based on soil loss failure criteria not exceeding 0.50 inches (1.27 cm).
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