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 Austin
 Standard Specifications Manual
 SERIES 600 - ENVIRONMENTAL ENHANCEMENT
 ITEM NO. 642S - SILT FENCE 9-1-11

  § 642S.3. Materials  

Latest version.

  • A.

    Fabric

    1.

    General:

    The silt fence fabric shall be of nonwoven polypropylene, polyethylene or polyamide thermoplastic fibers with non-raveling edges. The silt fence fabric shall be non-biodegradable, inert to most soil chemicals, ultraviolet resistant, unaffected by moisture or other weather conditions, and permeable to water while retaining sediment. The silt fence fabric shall be supplied in rolls a minimum of 36 inches (0.9 meter) wide.

    2.

    Physical Requirements:

    The fabric shall meet the requirements presented in Table 1, when sampled and tested in accordance with the methods indicated herein, on Standard Detail No. 642S-1 and/or on the Drawings.

    B.

    Posts:

    Posts shall be steel Tee or Y-posts, not less than 4 feet (1.22 meters) in length with a minimum weight of 1.25 pounds per foot (1.86 kilograms per meter) with a minimum Brinell Hardness of 143. Hangers shall be adequate to secure fence and fabric to posts. Posts and anchor plates shall conform to ASTM A-702. Caps are required (*not specifying discretionary criteria).

    C.

    Wire Fence:

    Wire fence shall be welded wire fabric 2 in. x 4 in. 12.5 SWG, wire diameter 0.099 in (±0.005 in.), and shall conform to Standard Specification Item No. 406, "Reinforcing Steel".

    TABLE 1. Silt Fence Fabric Requirements
    Physical Properties Method Requirements
    Fabric Weight in ounces per square yard (grams/square meter) TEX-616-J 5.0 minimum (150 minimum)
    Equivalent Sieve Opening Size: US Standard (SI Standard sieve size) CW-02215 40 to 100 (425 to 150 μm)
    Mullen Burst Strength: lbs. per sq. inch (psi) megaPascal (mPa) ASTM D-3786 280 minimum (1.9 minimum)
    Ultraviolet Resistance; % Strength Retention ASTM D-1682 70 minimum

     

     TxDoT Test Method Tex-616-J, "Testing of Construction Fabrics".

     US Army Corps of Engineers Civil Works Construction Guide Specification CW-02215, "Plastic Filter Fabric".

     ASTM D-3786, " Test Method for Hydraulic Bursting Strength of Knitting Goods and Nonwoven Fabrics: Diaphragm Bursting Strength Tester Method".

     ASTM D-1682, " Test Methods for Breaking Load and Elongation of Textile Fabrics ".