3.1 The purpose of this standard is to provide uniform terminology used in the development of methods and standards relating to ASTM Committee E64 on Stormwater Control Measures (SCMs).

1.1 These definitions apply to many terms found in the standards of ASTM Committee E64.

1.2 This terminology standard defines terms related to stormwater control measures in the various sections of standards under the jurisdiction of ASTM Committee E64.

1.3 Units—The values stated in inch-pound units are to be regarded as standard, except for methods to establish and report sediment concentration and particle size. It is convention to exclusively describe sediment concentration in mg/L and particle size in mm or μm, both of which are SI units. The SI units given in parentheses are mathematical conversions, which are provided for information purposes only and are not considered standard. Reporting of test results in units other than inch-pound units shall not be regarded as non-conformance with this test method.

1.4 This 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.