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
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The P300 permanent turf reinforcement mat shall be amachine-produced mat of 100% UV stable polypropylene fiber.
The matting shall be of consistent thickness with synthetic fibers evenly distributed over the entire area of the mat. The
matting shall be covered on the top with black heavyweight UV stabilized polypropylene netting having ultraviolet
additives to prevent breakdown and an approximate 0.50 x 0.50 inch (1.27 x 1.27 cm) mesh size. The bottom net shall
also be UV stabilized polypropylene, with a 0.625 x 0.625 inch (1.57 x 1.57 cm) mesh size. The matting shall be sewn
together on 1.50 inch (3.81 cm) centers with UV stabilized polypropylene thread.
Slone Desinn Data
Slo a Gradient S
Slo e Len L <_ 3:1 3.1-2:1 >_ 2.1
<_ 20 ft (6 m) 0.001 0.029 0.082
20 - 50 ft 0.036 0.06 0.096
>SOft(15.2m) 0.07 0.09 0.11
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Channel Design Data
Rou hness Coefficients
Flow De th Mannin 's `n'
< 0.50 ft 0.15 m 0.034
0.50 - 2.00 ft 0.034-0.020
> 2.00 ft 0.60 m 0.020
Values are approximate, precise values obtamea from
ECMDST"'
Approximate Maximum Flow Velocity
Unvegetated = 9 ft/s (2.7 m/s)
Ve etated =16 ft/s 4.9 m/s
Maximum Permissible Shear Stress*
Short Duration Lon Duration
Phase 1
UNVEGETATED 3.0 lbs/ftZ
144 Pa 2.0 lbs/ftz
96 Pa
Phase 2
PARTIALLY VEGETATED 8.0 lbs/ftz
383 Pa 8.0 lbs/ft2
383 Pa
Phase 3
FULLY VEGETATED 8.0 Ibs/ftz
383 Pa 8.0 Ibs/ft2
383 Pa
'Performance values obtained through third party 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).
Updated 1/2004