Summary Statement:

This metadata summary applies exclusively to the data as it appears in this Loudoun County intranet/internet mapping application. To see the fully FGDC compliant version of this metadata click here.

Abstract:

Water Bodies, including surface elevation, are a base map data layer derived by automated processes and processed for cartographic representation at 1:2400 scale. The polygon features represent the ponds, reservoirs, stormwater impoundments, marshes, and major creeks and rivers found on the County's base map as seen from above and are mapped to National Map Accuracy Standards (NMAS).

Purpose:

Water Bodies are used for water supply planning, the administration of related zoning restrictions, and to locate water supplies in rural areas for fighting fires.

Supplemental Information:

OMAGI updates all base map data via a photogrammetric process, using aerial imagery that is flown yearly in phases. A different portion of the County is updated each year with the base map maintenance services contract, depending upon development patterns and update funding. See "Lineage" section, in the full FGDC version, for the list of extents for each Phase area, which are listed as Data Sources. For a map of the most recent reviews and updates within the county, please click here.

Data are stored in the corporate Geodatabase as a polygon feature class. The coordinate system is Virginia State Plane (North), Zone 4501, datum NAD83 HARN, US Survey foot units.

Use Constraints:

Every reasonable effort has been made to assure the accuracy of these data. Loudoun County, Virginia does not assume any liability arising from the use of these data. These data are provided without warranty of any kind, expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular service. Reliance on these data is at the risk of the user. These data are intended for use at 1:2400 scale or smaller.

Maintenance and Update Frequency:

Annually

Completeness Report:

Base Map features have been updated from different sources and in different years. Although the entire county was originally mapped, users should be cautious and aware that any particular area of interest may not be absolutely current and up to date. This is a result of the development patterns and update funding determining what area to update, with the entire County being reviewed prior to any update.

Water Types

Double line stream     =   Creeks or rivers wider than 15 ft, may or may not be navigable
Lake or Pond           =   A large inland body of usually fresh water
Dry Retention Pond     =   Manmade stormwater retention pond typically associated with flood control structure; typically dry
Potomac River          =   Potomac River to north
Swamp or Marsh         =   Area of spongy, wet ground, usually with vegetation

Data Owner:

Office of Mapping and Geographic Information