9 Va. Admin. Code § 25-875-650

Current through Register Vol. 41, No. 9, December 16, 2024

Section 9VAC25-875-650 - Stormwater management impoundment structures or facilities

A. Stormwater management wet ponds and extended detention ponds that are not covered by the Impounding Structure Regulations (4VAC50-20) shall, at a minimum, be engineered for structural integrity for the 100-year storm event.

B. Construction of stormwater management impoundment structures or facilities may occur in karst areas only after a study of the geology and hydrology of the area has been conducted to determine the presence or absence of karst features that may be impacted by stormwater runoff and BMP placement.

C. Discharge of stormwater runoff to a karst feature shall meet the water quality criteria set out in 9VAC25-875-580 and the water quantity criteria set out in 9VAC25-875-600. Permanent stormwater management impoundment structures or facilities shall only be constructed in karst features after completion of a geotechnical investigation that identifies any necessary modifications to the BMP to ensure its structural integrity and maintain its water quality and quantity efficiencies. The person responsible for the land-disturbing activity is encouraged to screen for known existence of heritage resources in the karst features.

9 Va. Admin. Code § 25-875-650

Derived from Virginia Register Volume 40, Issue 8, eff. 7/1/2024.

Statutory Authority: § 62.1-44.15:28 of the Code of Virginia; Chapters 68 and 758 of the 2016 Acts of Assembly.