DRASTIC Mapping
DRASTIC is a mapping system which provides a systematic way for planners, administrators, and managers to address the relative vulnerability of an area's water table aquifer to contamination when making decisions that may impact the ground water resource. The name DRASTIC is derived from the seven factors that go into the maps. These are:
- Depth to water
- Recharge
- Aquifer Media
- Soils
- Topography
- Impact of Vadose Zones
- (Hydraulic) Conductivity
The system consists of two major components: the mapping of hydrogeologic settings and the assignment of an index number which helps the user evaluate the relative ground water pollution potential of these settings. This information can be used for preventative purposes through the prioritization of areas where ground water protection is critical and can identify areas where special attention is warranted.
DRASTIC was developed by the U.S. EPA and the National Water Well Association. Interest has been growing in Virginia since DRASTIC map training workshops were initiated by the Virginia Ground Water Protection Steering Committee. The following Virginia counties now have DRASTIC maps and are using them for various purposes:
| Amherst |
Nelson |
| Augusta |
Prince William |
| Botetourt |
Rappahannock |
| Carroll |
Rockbridge |
| Greene |
Rockingham |
| Henrico |
Shenandoah |
| Louisa |
Southampton |
| Middlesex |
Warren |
Six of these communities were part of an original pilot program undertaken by the Virginia Ground Water Protection Steering Committee. The others have been undertaken by local governments, Planning District Commissions, or other organizations.
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Page Last Modified 7-17-97