4 Va. Admin. Code § 50-20-59
For the purposes of categorizing and reporting information to national and other dam safety databases, impounding structure size shall be classified as noted in Table 2.
| Table 2 Impounding Structure Regulations | |
| Maximum Impounding Capacity (Ac-Ft) | Height (Ft) |
| Large ≥ 50,000 | ≥ 100 |
| Medium ≥ 1,000 & < 50,000 | ≥ 40 & < 100 |
| Small ≥ 15 & < 1,000 | ≥ 6 & < 40 |
§ 10.1-605 of the Code of Virginia.
Derived from Virginia Register Volume 24, Issue 25, eff. September 26, 2008.