Comparisons between leveling surveys of different epochs are used to determine vertical displacement of permanent bench marks. Displacement of bench marks usually represents the movement of the surrounding area. In this report, the 1978 Houston-Galveston and Texas Gulf Coast releveling surveys are compared to the 1963, 1973, and 1976 releveling results. The changes in elevations of bench marks common to two or more epochs are tabulated and plotted in Appendix A. From these differences, contour maps were prepared for the 1963 to 1978 and 1973 to 1978 epochs in the 2/sup 0/ x 2/sup 0/ area of maximum subsidence. Annual subsidence rates computed for the 1973 to 1978 period are about 25% less in the maximum subsidence area than the rates computed for the 1963 to 1973 period.

This report presents the results of the hydrologic data collection on new large-capacity and other selected wells, including well location and completion data, drillers' logs of the strata penetrated, water levels, and chemical quality of the produced water.

Report on the published data on ground-water development in the Houston, Texas district.

Report on new water wells in Harris and Galveston Counties, with hydrologic data, location, completion, logs, levels, and chemical quality.

Report on the land-surface subsidence in the Texas coastal region published in agreement with the U.S. Geological Survey. Includes information on the geography and topography of 5 different subregions of the Texas coastand maps of the different areas.

This report is about estimated number of Dredge Tows required to detect changes in Oyster abundance in Galveston Bay.

Report presenting data on ground-water withdrawals, describes subsidence monitoring and describes techniques that can be used to monitor subsidence.