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<br />PERFORMANCE SPECIFICATION <br />NORTH <br />AMH~ICAN <br />P550 <br />The composite turf reinforcement mat (C-TRM) shall be amachine-produced mat of 100% W stabilized <br />polypropylene fiber matrix incorporated into apermanentthree-dimensional turf reinforcement matting. <br />The matrix shall be evenly distributed across the entire width of the matting and stitch bonded between the <br />bottom and middle ultra heavy duty W stabilized nettings with 0.50 x 0.50 inch (1.27 x 1.27 cm) openings and <br />then covered by an ultra heavy duty W stabilized nettings with 0.50 x 0.50 inch (1.27 x 1.27 cm) openings. The <br />middle, dramatically corrugated (crimped) netting shall form prominent closely spaced ridges across the entire <br />width of the mat. The three nets shall be stitched together on 1.50 inch (3.81 cm) centers with W stabilized <br />polypropylene thread to form a permanent three-dimensional turf reinforcement matting. <br />Slope Design Data - Unvegetated Cover Factors <br /> Slope Gradient ( S) <br />Slope Length (L) 5 3:1 3:1-2:1 22:1 <br />5 20 ft (6 m) 0.00045 0.0145 0.0425 <br />20 - 50 ft 0.0173 0.0305 0.0495 <br />2 SO ft (15.2 m) 0.0345 0.0465 0.0565 <br /> <br />Channel Design Data <br />Roughness Coefficients - Unvegetated <br />Flow Depth Manning's'n <br />5 0.50 ft (0.15 m) 0.041 <br />0.50-2.OOft 0.040-0.014 <br />2 2.00 ft (0.60 m) ~ 0.013 <br />Maximum Permissible Sheaz Stress <br /> Short Duration Long Duration <br />Phase 1 <br />LINVEGETAIED 4.0 lbs/ft~ <br />(191 Pa) 3.25 Ibs/ftz <br />(156 Pa) <br />Phase 2 <br />PAKnALLY VEGETATED 12.0 lbs/ftz <br />(576 Pa) 12.0 Ib~/ft2 <br />(576 Pa) <br /> <br />Approximate Maximum Flow Velocity Phase 3 <br />Unvegetated =12.5 ft/s (3.8 m/s) FULLY VEGET <br /> <br /> <br /> <br />Vegetated = 25 ft/s (7.6 m/s) 14.0 lbs/ftz 1201bs/fN <br />ATED (672 Pa) (576 Pa) <br />Values aze approximate, precise values can be obtained using ECMDSTM <br />*Perfonnance values obtained through third party testing at the Texas Transportation Institute, Colorado State University, <br />and Utah State University based on soil loss failure criteria not exceeding 0.50 inches (1.27 cm). <br />L._J <br />