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To Fort Pillow Sand of the Wilcox Group of Tertiary age underlies approximately 7,700 sq mi in western Tennessee. The formation consists primarily of very fine to very coarse sand that locally contains minor lenses or beds of clay or silt. The Fort Pillow Sand ranges from 0 to 350...

A digital groundwater flow model was developed to approximate steady-state predevelopment flow conditions in the Upper Floridan aquifer of coastal west-central Florida. The aquifer is the major source of water and natural spring flow in the area. The aquifer was simulated as a one-layer system with constant vertical recharge and...

Suspended-sediment samples were collected from synoptic-sampling sites to determine suspended-sediment concentrations, loads, yields, and sediment-source areas in the Fountain Creek drainage basin upstream from Widefield, Colorado. Suspended-sediment yields ranged from 0.004 to 278 tons/sq mi/day. Twenty-four sites were sampled that represent urban and rural land use. The median suspended-sediment yield...

The Oakley Fan area is a broad, crescent-shaped lowland along the southern margin of the Snake River Plain in south-central Idaho. Intensive groundwater development for irrigation has resulted in rapid water-level declines and, as a consequence, designation by the State of four Critical Groundwater Areas. Principal aquifers are in limestone,...

Geologic and borehole geophysical logs made at 77 sites show that the hydrogeologic framework of the study area consists of a sequence of unconsolidated sediments typical of the Coastal Plain of Maryland. Three aquifers and two confining units were delineated within the study area. From the surface down, they are:...

Water quality of the surficial aquifer system in central Florida was evaluated at one exfiltration pipe, two ponds (detention and retention), and two swales in central Florida, representing three runoff-detention methods, to detect any effect from infiltrating highway runoff. Concentrations of major ions, metals, and nutrients in groundwater and bottom...