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Chapter 3 Revised: November 1993 <br /> b. Mullen Burst : Minimum 200 psi (ASTM D-3786) <br /> c . Equivalent opening size: Between 50 and 1-40 <br /> d. Water Flow Rate of 10 gal/min/sq. ft . at 50mm constant <br /> head as determined by multiplying permittivity in 1/sec <br /> as determined by ASTM D-4491 by a conversion factor of <br /> 74 . <br /> e. Ultra violet radiation stability of 90 percent, <br /> using test method ASTM D-4355 . <br /> f. A heavy duty nylon top support cord, slip cord, or <br /> equivalent is required to provide top support and <br /> prevent fence sagging. <br /> Maintenance <br /> 1 . Silt fences shall be inspected within 24 hours after each <br /> rainfall or daily during prolonged rainfall . Repair or <br /> replacement shall be done immediately if fencing is torn, <br /> sagging, overtopped, blown over (laying down) , shows a lack <br /> of material integrity, or in any way is not functioning as <br /> designed. <br /> 2 . Sediment deposits should be removed after each storm event . <br /> Sediment deposits shall be removed when deposits reach 0 . 5 <br /> the height of the fence <br /> Flow - <br /> Plan � <br /> r � <br /> A A <br /> B <br /> Elevation <br /> Points A should be higher than point B <br /> Source : Adapted from Installation of Straw and Fabric <br /> Filter Barriers for Sediment Control, Sherwood <br /> and Wyant <br /> B . 1. 4 <br />