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Virginia Administrative Code
Title 4. Conservation and Natural Resources
Agency 50. Virginia Soil and Water Conservation Board
Chapter 20. Impounding Structure Regulations
1/22/2019

4VAC50-20-101. General Permit Requirements for Low Hazard Potential Impounding Structures.

Any impounding structure owner whose registration statement is approved by the board will receive the following permit and shall comply with the requirements in it. If the failure of a low hazard potential impounding structure is not expected to cause loss of human life or economic damage to any property except property owned by the owner, the owner may follow the special criteria established for certain low hazard impounding structures in accordance with 4VAC50-20-51 in lieu of coverage under the general permit.

General Permit No.: Dam Safety 1
Effective Date: (Date of Issuance of Coverage)
Expiration Date: (6 years following Date of Issuance of Coverage)
GENERAL PERMIT FOR OPERATION OF A LOW HAZARD POTENTIAL IMPOUNDING STRUCTURE

In compliance with the provisions of the Dam Safety Act and attendant regulations, owners of an impounding structure covered by this permit are authorized to operate and maintain a low hazard potential impounding structure. The owner shall be subject to the following requirements as set forth herein.

1. The spillway design of the owner's impounding structure shall be able to safely pass a 100-year flood. When appropriate, the spillway design flood requirement may be further reduced to the 50-year flood in accordance with an incremental damage analysis conducted by the owner's engineer.

2. The owner shall develop and maintain an emergency preparedness plan in accordance with 4VAC50-20-177. The owner shall update and resubmit the emergency preparedness plan immediately upon becoming aware of necessary changes to keep the plan workable.

3. The owner shall perform an annual inspection of the impounding structure. The owner shall maintain such records and make them available to the department upon request. The department also shall conduct inspections as necessary in accordance with 4VAC50-20-180.

4. The owner shall ensure that the impounding structure is properly and safely maintained and operated and shall have the following documents available for inspection upon request of the department:

a. An operating plan and schedule including narrative on the operation of control gates and spillways and the impoundment drain;

b. For earthen embankment impounding structures, a maintenance plan and schedule for the embankment, principal spillway, emergency spillway, low-level outlet, impoundment area, downstream channel, and staff gages; and

c. For concrete impounding structures, a maintenance plan and schedule for the upstream face, downstream face, crest of dam, galleries, tunnels, abutments, spillways, gates and outlets, and staff gages.

Impounding structure owners shall not permit growth of trees and other woody vegetation and shall remove any such vegetation from the slopes and crest of embankments and the emergency spillway area, and within a distance of 25 feet from the toe of the embankment and abutments of the dam.

5. The owner shall file a dam break inundation zone map developed in accordance with 4VAC50-20-54 with the department and with the offices with plat and plan approval authority or zoning responsibilities as designated by the locality for each locality in which the dam break inundation zone resides.

6. The owner shall notify the department immediately of any change in circumstances that would cause the impounding structure to no longer qualify for coverage under the general permit. In the event of a failure or an imminent failure of the impounding structure, the owner shall immediately notify the local emergency services coordinator, the Virginia Department of Emergency Management, and the department. The department shall take actions in accordance with § 10.1-608 or 10.1-609 of the Code of Virginia, depending on the degree of hazard and the imminence of failure caused by the unsafe condition.

Statutory Authority

§ 10.1-605 of the Code of Virginia.

Historical Notes

Derived from Volume 29, Issue 02, eff. November 8, 2012.

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