nitrate, arsenic, and selenium concentrations in the pecos valley aquifer of west texas were compiled, mapped, and analyzed in the context of local geology and land use. alluvial deposits of sand, silt, clay, and gravel compose the unconfined aquifer. ranching and farming are predominant land uses in the rural study area. data were tabulated from 79 water wells with a median depth of 75 m and m...

Wadi aquifers in Saudi Arabia historically have been recharged primarily by channel loss (infiltration) during floods. Historically, seasonal groundwater levels fluctuated from land surface to about 3 m below the surface. Agricultural irrigation pumping has lowered the water table up to 35 m below the surface. The geology surrounding the fluvial system at Wadi Qidayd consists of pelitic Precamb...

Lahore is the provincial capital of Punjab and second most populous city in Pakistan. Aquifer rechargerates have been continuously decreasing over a long period time, which has caused significant decline watertable level. Rapid population growth, urban development, industrialization all raised demand for watersupplies. Due to infrastructural considerable portion land now impervious andrainfall ...

The recent delineation of a vastly expanded Holocene paleo-lake (the Northern Darfur Megalake which was originally mapped as the West Nubian Paleolake and here will be referred to as WNPL–NDML) in Darfur in northwestern Sudan has renewed hopes for the presence of an appreciable groundwater resource in this hyper-arid region of Eastern Sahara. This paleolake which existed within a closed basin p...

In the State of Paraíba semi-arid climate and geology igneous metamorphic rocks dominate, imposes serous limitations concerning storage groundwater. This work aimed to evaluate fractured aquifer in Agreste Paraibano environment. region stands out from regional context scarcity plays an important role supply water periods without rain. evaluated 180 wells located aquifer, encompassing 9 municipa...

Existing geologic models of geothermal systems work reasonably well for the exploration of systems clearly associated with active, or recently active, volcanic centers. The poor results of exploration drilling undertaken during the last few years in the non-volcanic systems of the western United States, however, indicate that the model being used for exploring these systems requires significant...

Geology of this area is ranging from Precambrian age for the rocks of granite, gneisses, schist and quartzite rocks, to recent age overlain by thick layers of alluvial deposits. This study aims to evaluate geological and structural influences on groundwater of Chamarajanagar taluk. It is an essential resource in outcrop and structures of the area, because of local field conditions, such as rock...

Geophysical techniques coupled with the modern computer workstation have not been widely used in environmental geology. The Kansas Geological Survey is investigating the application of the computer workstation in a number of projects underway that involve environmental questions and problems associated with salt dissolution. The computer workstation provides an efficient approach to integrate g...

We present in this note an innovative software environment, called Interactive Ground Water (IGW), for unified deterministic and stochastic ground water modeling. Based on efficient computational algorithms, IGW allows simulating three-dimensional (3D) unsteady flow and transport in saturated media subject to systematic and "random" stresses and geological and chemical heterogeneity. Adopting a...