4 Va. Admin. Code § 25-31-450
Sediment basins shall be located as close to the disturbed area as possible. Sediment basins shall not be located in perennial streams. Sediment control measures shall be installed prior to land disturbing activities within the drainage area controlled by the sediment basin. Each primary sediment basin shall provide at least 0.125 acre feet of storage capacity for each acre of disturbed land draining to it. Storage basins shall be cleaned as necessary to ensure proper functioning before they reach 60% capacity. Alternate sediment control measures that are as effective as sediment basins may be approved. The measures may include reduced basin storage capacity for small short-term disturbances, sediment channels, check dams, or mining methods that incorporate sediment control.
4 Va. Admin. Code § 25-31-450
Statutory Authority: §§ 45.1-161.3 and 45.1-180.3 of the Code of Virginia (4VAC25-31-120, 4VAC25-31-130, 4VAC25-31-170, 4VAC25-31-240, 4VAC25-31-360, 4VAC25-31-405, 4VAC25-31-410, 4VAC25-31-420, 4VAC25-31-430, 4VAC25-31-440, 4VAC25-31-450).