1.1This test method is used to determine the filtering efficiency and the flow rate of the filtration component of a sediment retention device, such as a silt fence, silt barrier, or inlet protector.

1.1.1The results are shown as a percentage for filtering efficiency and cubic metres per square metre per minute (m³/m²/min) or gallons per square foot per minute (gal/ft²/min) for flow rate.

1.1.2The filtering efficiency indicates the percent of sediment removed from sediment-laden water.

1.1.3The flow rate is the average rate of passage of the sediment-laden water through the filtration component of a sediment retention device.

1.2This test method requires several specialized pieces of equipment, such as an integrated water sampler and an analytical balance, or a vacuum filtration system. At the client's discretion, the test soil is either a site-specific soil or a soil that is representative of a target default gradation.

1.3The 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.

1.4This 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.