Reports
Land subsidence monitoring at Arnold, Broad Creek, and Crofton Meadows well fields in Anne Arundel County, Maryland: 2016 survey
2016, Andreasen, D.C.
Administrative Report 16-02-01
Abstract
A GPS survey was completed May 3-13, 2016 to determine the heights of 3d marks at the Arnold, Broad Creek, and Crofton Meadows 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 3.640 +/-0.001 m at Arnold, 6.175 +/-0.001 m at Broad Creek, and 7.101 +/-0.002 m at Crofton Meadows. Historical GPS data (1999 to 2015) for the same marks were re-processed using OPUS Projects. The range in ellipsoid height elevation over the period 1999 to 2016 was 0.047 m at Arnold, 0.028 m at Broad Creek, and 0.040 m at Crofton Meadows. There are no discernible trends in ellipsoid heights over the period of record to indicate land subsidence.
