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This 116-page report presents the results of an investigation by the Utah Geological Survey of land subsidence and earth fissures in Cedar Valley, Iron County, Utah. Basin-fill sediments of the Cedar Valley Aquifer contain a high percentage of fine-grained material susceptible to compaction upon dewatering. Groundwater discharge in excess of recharge (groundwater mining) has lowered the potentiometric surface in Cedar Valley as much as 114 feet since 1939. Groundwater mining has caused permanent compaction of fine-grained sediments of the Cedar Valley aquifer, which has caused the land surface to subside, and a minimum of 8.3 miles of earth fissures to form. Recently acquired interferometric synthetic aperture radar imagery shows that land subsidence has affected approximately 100 mi² in Cedar Valley, but a lack of accurate historical benchmark elevation data over much of the valley prevents its detailed quantification. Continued groundwater mining and resultant subsidence will likely cause existing fissures to lengthen and new fissures to form which may eventually impact developed areas in Cedar Valley. This report also includes possible aquifer management options to help mitigate subsidence and fissure formation, and recommended guidelines for conducting subsidence-related hazard investigations prior to development.
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Land Between the Lakes Recreation Area lies in western Kentucky and Tennessee, between two huge lakes formed by dams on the Tennessee and Cumberland rivers.Some 170,000 acres bounded by 300 miles of shoreline, Land Between the Lakes is blessed with a rich variety of plant and animal life. Conceived and administrated by the Tennessee Valley Authority, it is a unique recreational experiment which has drawn admiring visitors from around the world. Frank E. Smith, director of TVA, tells the story of the transformation of submarginal land into a large-scale, multiple-use recreation facility that provides recreation and entertainment for thousands of visitors as well as producing a positive, dynamic stimulus to the continued economic development of the entire Tennessee Valley. Planned for fullest use of human and land resources, Land Between the Lakes is of utmost importance to recreational planners, conservation specialists, administrators, and to millions of Americans who seek their recreation in the out of doors.