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PERFORMANCE SPECIFICATION NORTH AM9~IC.AN P550 The composite turf reinforcement mat (C-TRM) shall be amachine-produced mat of 100% W stabilized polypropylene 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 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. Slope Desi~rt Data - Unve~etated Cover Factors Slope Gradient (S) Slope Length (L) S 3:1 3:1-2:1 z 2:1 5 20 ft (6 m) 0.00045 0.0145 0.0425 20 - 50 ft 0.0173 0.0305 0.0495 2 50 ft (15.2 m) 0.0345 0.0465 0.0565 Channel Design Data Roughness Coefficients - Unvegetated Flow Depth Manning's'n <_0.50ft(0.15m) 0.041 0.50-2.OOft 0.040-0.014 2 2.00 ft (0.60 m) 0.013 Maximum Permissible Shear Stress Short Duration Lon Duration Phase 1 Ut~vEGErATED 4.0 Ibs/ft2 (191 Pa) 3.251bs/ftz (156 Pa) Phase 2 PARTIALLY VEGETATED 12.0 Ibs/ftz (576 Paj 1201bs/ftz (576 Pa) Approximate Maximum Flow Velocity Phase 3 Unvegetated =12.5 ft/s (3.8 m/s) FULLY VEGET Vegetated = 25 ft/s (7.b m/s) 14.0 Ibs/ft= 1201bs/ft2 ATED (672 Pa) (576 Pa) Values aze approximate, precise values can be obtained using ECMDST"~ *Performance values obtained through Hurd 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).