Science and Research Resources

Harris-Galveston Subsidence District Science and Research Plan (2015)

The District Science and Research Plan represents the “strategic direction” for science and research conducted or supported by the Harris-Galveston Subsidence District (HGSD) and, as such, is an essential component of the District’s regulatory planning process. The Science Plan is designed to be a dynamic document with the intention to provide clarity to the strategic direction of the District and guidance to future science and research priorities in support of the District Regulatory Plan.
HGSD Science and Research Plan, Adopted 2015

REPORT: Evaluation of Aquifer Storage and Recovery Projects on Subsidence in the Gulf Coast Aquifer
Click here to view the executive summary
Click here to view the project report

REPORT: Investigation of Brackish Groundwater Resources in the Gulf Coast Aquifer
Click here to view the executive summary
HGSD Scientific Report 2018-001
HGSD Scientific Report 2018-002

Water-Level Altitudes and Water-Level Changes (2016/2017)

The U.S. Geological Survey, in cooperation with the Harris‐Galveston Subsidence District, City of Houston, Fort Bend Subsidence District, Brazoria County Groundwater Conservation District, and Lone Star Groundwater Conservation District, collects, processes, and interprets groundwater-level and aquifer-sediment-compaction data to understand the effects of groundwater withdrawal on land subsidence in the Houston-Galveston region, Texas. The following reports provide recent datasets of water-level changes and approximate water-level altitudes in the Chicot, Evangeline, and Jasper aquifers in the Houston-Galveston region, Texas. The water-level measurements in the dataset are built upon and stored in the National Water Information System: web interface, groundwater information, and field measurements website located here: http://dx.doi.org/10.5066/F7P55KJN and the subsidence viewer located here: https://txpub.usgs.gov/houston_subsidence/viewer/index.html. These sites provide a publicly available, searchable, online database of water information.

Kasmarek, M.C., and Ramage, J.K., Water-level altitudes 2017 and water-level changes in the Chicot, Evangeline, and Jasper aquifers and compaction 1973–2016 in the Chicot and Evangeline aquifers, Houston-Galveston region, Texas: U.S. Geological Survey Scientific Investigations Report 2017–5080, https://doi.org/10.3133/sir20175080

Kasmarek, M.C., and Ramage, J.K., 2016, Water-Level Measurement Data Collected during 2015-2016 and Approximate Long-term Water-Level Altitude Changes of Wells Screened in the Chicot, Evangeline, and Jasper Aquifers, Houston-Galveston Region, Texas: U.S. Geological Survey data release, http://dx.doi.org/10.5066/F77H1GP3.

Cumulative Compaction of Subsurface Sediments (2015) in Thirteen Extensometers Completed in the Chicot and Evangeline Aquifers in the Houston-Galveston Region, Texas

The U.S. Geological Survey in cooperation with the Harris‐Galveston Subsidence District, City of Houston, Fort Bend Subsidence District, and Lone Star Groundwater Conservation District has produced this dataset of compaction values in the Chicot and Evangeline aquifers in the Houston‐Galveston region, Texas. This dataset shows compaction values of subsurface sediments (mostly in the fine-grained silt and clay layers because little compaction occurs in sand layers) in the Chicot and Evangeline aquifers was recorded continuously by using analog technology at the 13 extensometers at 11 sites that were either activated or installed between 1973 and 1980. The cumulative compaction data for each extensometer are collected about 13 times per year during site visits. The amount of cumulative compaction for each site visit is determined by subtracting the previously recorded compaction value from the ending compaction value. This data release will be updated annually with new compaction data recorded from the previous year.

Ramage, J.K., 2016, Cumulative Compaction of Subsurface Sediments (2015) in Thirteen Extensometers in the Chicot and Evangeline Aquifers in the Houston-Galveston Region, Texas: U.S. Geological Survey data release, http://dx.doi.org/10.5066/F79K48BK.

The Harris-Galveston Coastal Subsidence District/National Geodetic Survey Automated Global Positioning System Subsidence Monitoring Project (1995)

A report by: David B. Zilkoski, Lucy W. Hall, Gilbert J. Mitchell, Vasanthi Kammula, Ajit Singh, William M. Chrismer, and Ronald J. Neighbors

GPS-Project

Harris-Galveston Subsidence District Annual Groundwater Report – 2018 (vol. 43)

Pursuant to Harris-Galveston Subsidence District (the District or HGSD) Resolution No. 2019-1032 passed on June 12, 2019, the Board of Directors held the Annual Groundwater Hearing beginning at 10:00 a.m. on May 28, 2019. The public hearing fulfills the requirements of the District’s enabling legislation, which states that the Board of Directors shall hold a public hearing to take testimony concerning the effects of groundwater withdrawals on the subsidence of land within the District during the preceding year. This report documents the impact of groundwater use on aquifer water levels and subsidence within the District and was prepared in accordance with an Inter-local Agreement between the District and the Fort Bend Subsidence District (FBSD).

Click here for the Executive Summary of the Annual Groundwater Report for 2018

Click here for the Complete Annual Groundwater Report for 2018

Click here for a companion ArcGIS Online Map of Subsidence Rates in Harris and surrounding Counties, Texas, USA

Regional Groundwater Update Project – Final Report (2013)

The purpose of this report is to summarize the results of the Regional Groundwater Update Project (RGUP). The RGUP originally started in 2010 as the Harris-Galveston Subsidence District (HGSD) 1999 Regulatory Plan Update, but due to its benefits to other regional groundwater regulatory agencies, the Fort Bend Subsidence District (FBSD) and the Lone Star Groundwater Conservation District (LSGCD) joined the collaborative effort in 2010.The primary benefit of collaboration between these three entities is that each of them could use the RGUP to vet their existing regulatory plans using updated population/water demand data and groundwater modeling capability, and in the case of HGSD and FBSD, investigate the physical effects of changing their existing regulatory plans to accommodate the practical realities facing their stakeholders while successfully completing the District’s mission objectives.

Click here to view the project report

Click here to view attachments to the project report

Click here to view the District Regulatory Plan (2013)

Selected other maps and spatial data

HGSD Regulatory Area Map

Subsidence Contour Map 1906-2000