Fig. 1
From: Land subsidence and aquifer compaction in Montgomery County, Texas, U.S.: 2000–2020
Map showing the contours of average subsidence rates (2016–2020) derived from over 210 permanent GPS observations (> 3 years) within the Greater Houston region. The gray squares represent GPS sites used for creating the contour map. The subsidence rates are aligned to the Stable Houston Reference Frame (Houston20). The northwest corner of this map displays outcrops of the Gulf Coast Aquifer (Casarez 2020). The color patterns represent the areas regulated by the Harris-Galveston Subsidence District (HGSD: Areas 1, 2, 3), the Fort Bend Subsidence District (FBSD: Areas A and B), the Brazoria County Groundwater Conservation District (BCGCD), and the Lone Star Groundwater Conservation District (LSGCD)