Fig. 2
Overview of the quality control step. The data was structured to exclude any records that did not correspond to water or monitoring wells (Step 1). Then, all wells located within 10 meters of each other were checked to eliminate potential duplicates (Step 2). Next, all wells outside Brazilian territory were removed (Step 3), and wells with missing drilling dates or the date they were entered into the database were also excluded. After these steps, 351,256 records were identified as likely unique wells, including approximately 450 monitoring wells.
