Virginia and West Virginia Water Science Center

Virginia Extensometer Drilling Site

The USGS Nansemond drilling site.

The USGS Nansemond research station.

The USGS Nansemond pipe extensometer (59D 39) with a total depth of 1,960 feet.

The USGS Nansemond pipe extensometer (59D 39) showing the triangular table in green and the instrument bridge in yellow above the extensometer. The piers that support the table extend down 65 feet. The movement of the table relative to the extensometer is how land-surface movement is measured.

The USGS Nansemond pipe extensometer with a total depth of 1,960 feet.

The USGS Nansemond research station. The Nansemond extensometer (59D 39) is located in the tan building.  The surficial aquifer observation well (59D 40) is located in the green standpipe on the left, the lower (59D 34) and middle (59D 35) Potomac aquifer observation wells are in the middle green standpipe, and the upper (59D 36) Potomac aquifer and Piney Point (59D 37)

An analog dial gage (left) and a digital linear potentiometer (right with blue barrel) used to measure land-surface movement in response to aquifer system deformation at the USGS Nansemond extensometer. The potentiometer is the primary instrument for the extensometer with a resolution of about 0.00001 feet (0.003048 millimeters) and a travel range of 0.328084 feet (100

Virginia and West Virginia Water Science Center's analog dial gage and a digital linear potentiometer (blue barrel) used to measure land-surface movement in response to aquifer system deformation at the USGS Nansemond extensometer. The potentiometer is the primary instrument for the extensometer with a resolution of about 0.00001 feet (0.003048 millimeters) and a travel

Pivot block where the USGS Nansemond extensometer connects to the fulcrum arm.

Installing the linear potentiometer on the USGS Nansemond extensometer.