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Inventory & Mapping Project
Wetlands Model Process  Wetlands Model
Important wetlands-related work recently conducted by Loudoun County includes the Wetlands Inventory and Mapping Project. This three-year project was approved by the Board of Supervisors and jointly funded by Loudoun County and a grant provided by the U.S. Environmental Protection Agency. Additional assistance was provided by the U. S. Army Corps of Engineers, the Virginia Department of Environmental Quality, the Natural Resources Conservation Service, and the Loudoun Soil and Water Conservation District.

Using Geographic Information System (GIS) technology, expertise in wetland characteristics, and field verification, several parameters including soil type, topography, stream location, and floodplain, were determined to be primary predictors of where wetlands occur. These various data sets were compiled, using GIS geoprocessing tools, to create the Predictive Wetlands Model.

Maps
Output from the model identifies potential wetland areas, thereby providing county staff and the development community with an inexpensive resource for making improved land use decisions and helping to conserve and protect these valuable areas. Maps of the predicted wetland areas are available to citizens through WebLogis, the county’s online mapping system.

No-Net Loss
The Predictive Wetlands Model supports the no-net loss of wetlands policy identified in the county’s Revised General Plan. This policy seeks to preserve wetlands because of the water quality, flood control, groundwater recharge, habitat, and aesthetic benefits that they provide.


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