Reports
Land subsidence monitoring at Arnold, Broad Creek, and Crofton Meadows wells fields in Anne Arundel County, Maryland: Fall, 2016 survey
2017, Andreasen, D.C.
Administrative Report 17-02-04
Key Results
A GPS survey was completed October 17-20, 2016 to determine the heights of 3d marks at the Arnold (ARNO-1), Broad Creek (BROA-1), and Crofton Meadows (CROF-1) well fields in Anne Arundel County, Maryland. The GPS data were processed using the National Geodetic Survey’s Online Positioning User Service (OPUS) Projects utility. The ellipsoid heights determined through OPUS Projects were 3.639 meters at ARNO-1, -6.184 meters at BROA-1, and 7.090 meters at CROF-1. The rate of change in ellipsoid height over a 17-year period of record is approximately 1.3, 0.62, and 0.75 millimeters/year at ARNO-1, BROA-1, AND CROF-1, respectively. Height uncertainty for the Fall 2016 measurements is +/- 0.1 centimeter.
