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Virginia Administrative Code
Title 9. Environment
Agency 25. State Water Control Board
Chapter 875. Virginia Erosion and Stormwater Management Regulation
11/21/2024

9VAC25-875-720. Flooding.

A. Downstream properties and waterways shall be protected from damages from localized flooding due to changes in runoff rate of flow and hydrologic characteristics, including changes in volume, velocity, frequency, duration, and peak flow rate of stormwater runoff in accordance with the minimum design standards set out in this section.

B. The 10-year post-developed peak rate of runoff from the development site shall not exceed the 10-year predeveloped peak rate of runoff.

C. In lieu of subsection B of this section, localities may, by ordinance in accordance with § 62.1-44.15:33 of the Code of Virginia, adopt alternate design criteria based upon geographic, land use, topographic, geologic factors, or other downstream conveyance factors as appropriate.

D. Linear development projects shall not be required to control post-developed stormwater runoff for flooding, except in accordance with a watershed or regional stormwater management plan.

Statutory Authority

§ 62.1-44.15:28 of the Code of Virginia.

Historical Notes

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

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