Previously, we identified issues causing high uncertainty in surface and groundwater elevation data due to unstable survey reference points and delays in reporting field-based sensor position adjustments. Permanent benchmarks are now installed at most aquatic sites to serve as controlled location reference points and updated elevations from the associated site resurveys are available on the data portal. Surface and groundwater elevation data products have been reprocessed, and, the corrected data will be available via the data portal by January 18, 2020.
Permanent benchmarks have been installed at the following sites: POSE, LEWI, SUGG, BARC, CRAM, KING, MCDI, MAYF, PRPO, PRLA, BLDE, WLOU, FLNT, LIRO, BLUE, GUIL, ARIK, CUPE, PRIN, MART, BIGC, REDB, HOPB, COMO, SYCA, WALK, TOMB, BLWA.
Additionally, an error was identified where 30-minute averaged groundwater elevation data included anomalous data points in the averages. This error has been fixed and the data have been reprocessed.