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

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• AMEGRI~C.AN GREEN° C350 The composite turf reinforcement mat (C-TRM) shall be amachine-produced mat of 100% coconut fiber matrix incorporated into a permanent three-dimensional turf reinforcement matting. The matrix shall be stitch bonded between a super heavy duty UV stabilized bottom net with 0.50 x 0.50 inch (1.27 x 1.27 cm) openings, a ultra duty UV stabilized, dramatically corrugated (crimped) intermediate netting with 0.50 x 0.50 inch (1.27 x 1.27 cm) openings, and covered by a super heavy duty UV stabilized top net with 0.50 x 0.50 inch (1.27 x 1.27 cm) openings. The 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 LTV stabilized polypropylene thread to form a permanent three-dimensional turf reinforcement matting. Slo a Desi n Data - Unve etated Cover Factors Slope Gradient (S) Slope Length (L) 5 3:1 3:1-2:1 >- 2:1 5 20 ft (6 m) 0.0005 0.015 0.043 20 - 50 ft 0.018 0.031 0.050 z 50 ft (15.2 m) 0.035 0.047 0.057 Cha. Roughness Coefficients -Unvegetated Flow Depth Manning's'n' <_ 0.50 ft (0.15 m) 0.041 0.50 - 2.00 ft 0.040-0.013 >_ 2.00 ft (0.60 m) 0.012 Approximate Maximum Flow Velocity Unvegetated = 10.5 ft/s (3.20 m/s) Vegetated = 20 ft/ s (6.0 m/ s) of Tlacivn T)ata Maximum Permissible Shear Stress* Short Duration Long Duration Phase 1 UIwEGETATED 3.201bs/ft2 (153 Pa) 3.00 lbs/ftz (144 Pa) Phase 2 PARTIALLY VEGETATED 10.00 lbs/ftz (480 Pa) 10.00 lbs/ftz (480 Pa) Phase 3 FULLY VEGETATED 12.00 lbs/ftz (576 Pa) 10.00 lbs/ft2 (480 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 Utah State University based on soil loss failure criteria not exceeding 0.50 inches (1.27 cm). PERFORMANCE SPECIFICATION •