| Table E-2. Geotextile Physical Requirements* | |||||||
| Construction Class | |||||||
| Class 1 | Class 2 | Class 3 | Class 4 | ||||
| Subsurface | Erosion Control | Sediment Control | |||||
| Fabric Property | Test Method | Drainage | Type A | Type B | Type A | Type B | Separation |
| 1. Grab tensile strength (lbs.) | ASTM-D1682 (1") | 90 | 200 | 120 | 200 | 120 | 270 |
| 2. Grab tensile elongation (%) | ASTM-D1682 | 20 | 15-45 | 15 | 15-45 | 15 | 15 |
| 3. Burst strength (psi) | ASTM-D751 (Diaphragm Method) |
150 | 400 | 200 | 400 | 200 | 430 |
| 4. Puncture (lbs.) | ASTM-D3787 (5/16" flatrod) |
40 | 80 | 40 | 80 | 40 | 110 |
| 5. Trapezoid tear strength (lbs.) | ASTM-D1117 | 50 | 75 | 50 | 75 | 50 | 75 |
| 6. Apparent opening size (Sieve No.) | CW-02215a | ³ #40 (£ 425µm) |
#40-100b (425µm-150µm |
³ #40 (£ 425µm) |
— | — | ³ #70 |
| 7. Water permeability, k, (cm/sec) | PA Test Method No. 314 | 0.01c | 0.01c | 0.01c | — | — | — |
| 8. Abrasion resistance (lbs.) | ASTM-D1175 & D1682 | 25 | 55 | 25 | — | — | 40 |
| 9. Slurry flow rate (gal./min./ft) | VTM-51d | — | — | — | 0.3 | 0.3 | — |
| 10. Retention efficiency (%) | VTM-51d | — | — | — | 75 | 75 | — |
| 11. Percent open area | CW-02215a | — | 4.0b | — | — | — | — |
| 12. Sewn seam breaking strength (lbs.) | ASTM-D1682 | — | 200 | 120 | — | — | — |
| 13. Ultraviolet resistance, strength retention (%) | ASTM-D1682, after 500 hrs. of Xenon or Atlas Twin Arc Weather-o-meter | — | — | — | 70% of 1. | 70% of 1. | — |
| * The numerical values indicate the average minimum roll value or the minimum-to-maximum range. Average minimum roll value for Class 3 material is in the warp direction only.a)U.S. Army Corps of Engineer’s specificationsb Design specified.c* kfabric ³ 10 times ksoil dVirginia D.O.T. Test Method | |||||||