Houston-Galveston, Texas Managing Coastal Subsidence
HOUSTON-GALVESTON, TEXAS Managing coastal subsidence TEXAS he greater Houston area, possibly more than any other Lake Livingston A N D S metropolitan area in the United States, has been adversely U P L L affected by land subsidence. Extensive subsidence, caused T A S T A mainly by ground-water pumping but also by oil and gas extraction, O C T r has increased the frequency of flooding, caused extensive damage to Subsidence study area i n i t y industrial and transportation infrastructure, motivated major in- R i v vestments in levees, reservoirs, and surface-water distribution facili- e S r D N ties, and caused substantial loss of wetland habitat. Lake Houston A L W O Although regional land subsidence is often subtle and difficult to L detect, there are localities in and near Houston where the effects are Houston quite evident. In this low-lying coastal environment, as much as 10 L Galveston feet of subsidence has shifted the position of the coastline and A Bay T changed the distribution of wetlands and aquatic vegetation. In fact, S A Texas City the San Jacinto Battleground State Historical Park, site of the battle O Galveston that won Texas independence, is now partly submerged. This park, C Gulf of Mexico about 20 miles east of downtown Houston on the shores of Galveston Bay, commemorates the April 21, 1836, victory of Texans 0 20 Miles led by Sam Houston over Mexican forces led by Santa Ana. About 0 20 Kilometers 100 acres of the park are now under water due to subsidence, and A road (below right) that provided access to the San Jacinto Monument was closed due to flood- ing caused by subsidence.
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