Example of a Hydrograph
GroundwaterVirginia
| This hydrograph of an observation well in Lancaster County, VA illustrates the long-term decline of the artesian water level of the Potomac aquifer (Cretaceous age). |
| This hydrograph of an observation well in Lancaster County, VA illustrates the long-term decline of the artesian water level of the Potomac aquifer (Cretaceous age). |