Agencies | Governor
Virginia Regulatory Town Hall
Department of Conservation and Recreation
Virginia Soil and Water Conservation Board
Impounding Structure Regulations [4 VAC 50 ‑ 20]
Amend provisions of Virginia’s Impounding Structure Regulations to enhance the Dam Safety Program and to improve public safety.
General Information
Action Summary The purpose of this regulatory action is to consider amendments to the Virginia Soil and Water Conservation Board’s Impounding Structure Regulations that would: (i) establish an alternative procedure (decision matrix) which would allow for the evaluation of spillway design floods (SDF) less than the probable maximum flood (PMF) where there would be no unreasonable or significant increase in hazard to life and property; (ii) establish alteration permit requirements similar to construction permit requirements; (iii) expand the requirements of an Emergency Action Plan to meet federal requirements; (iv) amend references to new and existing dams to clarify that the regulations refer to all dams unless otherwise specified; (v) improve the applicability and consistency of Table 1 in 4 VAC 50-20-50 and improve the risk classification system; (vi) establish permit application fees for the administration of the dam safety program; (vii) amend or remove the forms that are incorporated by reference; (viii) clarify the meanings of terminologies such as “significantly”, “appropriate”, and “reasonable” as well as the threshold at which “probable” becomes “possible”; and, (ix) revise the Impounding Structure Regulations, as needed, to improve the administration and implementation of the Virginia Dam Safety Program.
Chapters Affected Only affects this chapter.
Exempt from APA No, this action is not exempt from Article II of the APA and executive branch review.
RIS Project Yes  [000585]
New Periodic Review This action will not be used to conduct a new periodic review.
Stages associated with this regulatory action.
Stage ID Stage Type Status
3454 NOIRA Stage complete. Comment period ended 02/24/2006.
4047 Proposed Stage complete. Comment period ended 10/19/2007.
4582 Final Stage complete. This regulation became effective on 09/26/2008.
Contact Information
Name / Title: Lisa McGee  / Policy and Planning Director
Address: 600 East Main Street, 24th Floor
Richmond, VA 23219
Email Address:
Phone: (804)786-4378    FAX: (804)786-6141    TDD: ()-

This person is the primary contact for this agency.