DPWES Letters to Industry

Department of Planning and Zoning
12055 Government Center Parkway
Fairfax, Virginia 22035
703-324-1380, TTY 711

May 18, 2004
Revised July 14, 2004

Stormwater Management Facility Submission
Requirements Zoning Ordinance Amendment

On March 29, 2004, the Board of Supervisors adopted the Stormwater Management Facility Submission Requirement Zoning Ordinance Amendment which expands the submission requirements for all special permit, special exception, rezoning and development plan applications. This amendment became effective on July 1, 2004 at 12:01 a.m. All special permit, special exception, rezoning and development plan applications accepted prior to the effective date are not subject to the new submission requirements.

Under the adopted amendment, all plats or development plans submitted with special permit, special exception, rezoning or development plan applications would be required to include the location, estimated size of facility footprint in area and type of all stormwater management facilities, including the full extent of side slopes, embankments, spillways, dams and water surface elevations of design storms, if applicable. In addition, all applications are required to submit a preliminary stormwater management plan that includes information about the adequacy of downstream drainage, including the sufficiency of capacity of any storm drainage pipes and other conveyances into which stormwater runoff from the site will be conveyed.

In addition to the above, those applications proposing land disturbing activity of 2500 square feet or more are required to submit additional graphic and narrative information. The graphic information requires the depiction of: 1) the facility footprint and, where applicable, the height of any dam embankment and location of the emergency spillway outlet; 2) the on-site and off-site areas to be served by the facility and the acreage draining to each facility; 3) a preliminary layout of all on-site drainage channels, outfalls, and pipes within the facility; 4) the location of any access roads or other means of access to the facility with a description of the type of road surface; 5) proposed landscaping and tree preservation areas in or near the facility; and 6) the approximate limits of clearing and grading on-site and off-site for the facility, storm drainage pipes, spillways, access roads and outfalls, including energy dissipation, storm drain outlet protection and/or stream bank stabilization measures. The narrative information requires: 1) a description of how the detention and best management practice (BMP) requirements will be met; 2) the estimated area and volume of storage of the stormwater management facility to meet the detention and BMP requirements; 3) the existing outfall conditions for each watercourse receiving drainage from the site; and 4) a description of how adequate outfall requirements of the Public Facilities Manual will be satisfied.

In addition to the more detailed stormwater management submission requirements, this amendment increases the required number of special exception and special permit plats submitted from 22 to 23. This amendment also reduces the maximum contour interval depicted on the required existing topography map from 5 to 2 for special exception and special permit plats.

The amendment also adds a minor modification provision that allows the Zoning Administrator to approve modifications to an approved special permit, special exception, rezoning or development plan that result in an increase in the amount of clearing and/or grading for a stormwater management facility, provided that such additional clearing and/or grading does not reduce non-stormwater management open space, tree save and/or landscaping on the lot.

A copy of the adopted Zoning Ordinance amendment is available at the Department of Planning and Zoning home page under "Current Projects". Questions concerning this amendment and a hard copy of the amendment may be obtained by calling 703-324-1314, TTY 711 .

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