Standard Test Method for Determining Filtering Efficiency and Flow Rate of a Geotextile for Silt Fence Application Using Site-Specific Soil
1.1 This test method is used to determine the filtering efficiency and the flow rate of a geotextile used exclusively in silt fence or silt barrier application.
1.1.1 The results are shown as a percentage for filtering efficiency and cubic metres per square metre per minute (m /m /min) or gallons per square foot per minute (gal/ ft /min) for flow rate.
1.1.2 The filtering efficiency indicates the percent of sediment removed from sediment-laden water.
1.1.3 The flow rate is the average rate of passage of the sediment-laden water through the geotextile.
1.2 This test method requires several specialized pieces of equipment, such as an integrated water sampler and an analytical balance, and site specific soil from the construction project.
1.3 The values stated in SI units are the standard, while the inch-pound units are provided for information. The values expressed in each system may not be exact equivalents; therefore, each system must be used independently of the other, without combining values in any way.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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