Coefficients B and C of the Jacob (1947) equation, usually derived from step-drawdown tests, are commonly attributed to “aquifer losses” and “well losses”, respectively. This paper analyzes and separates the linear laminar, nonlinear laminar and turbulent losses occurring during flow from an aquifer to a screened well. From this, one can derive a detailed physical meaning for both coefficients. The

Shallow alluvial and karst aquifers and widespread inadequate sanitation practices combine to impact water resources in Haiti. The vulnerability of aquifers is complicated by complex cultural, ecological, geological, hydrological, and hydrogeological considerations. Roughly 84% of the rocks exposed in Haiti consist of calcareous rocks and alluvium. These lithologies serve as an efficient reservoir

The creation of artificial dunes for coastal protection may have important consequences for freshwater lenses in coastal aquifers. The objective of this study was to compare the recharge processes below such a young dune with scant vegetation to an older dune covered by grass and herbaceous vegetation. To this aim, soil and water samples were collected from the unsaturated zone at two sites on Langeoog

Studies of solute transport in unconfined coastal aquifers typically neglect oceanic oscillations and assume a static seaward boundary condition defined by the mean annual sea level. In this paper, an image monitoring method is used to establish the quantitative relationship between the concentration of a colored tracer and the hue value of the image. The digital image was used to determine the tracer

In the drylands of Northern Mendoza, Argentina, water supply depends on rivers and groundwater. Climate change makes this region vulnerable due to the snow-glacial-melt regime of the main rivers and populations being concentrated in “irrigated oasis” areas. This article synthesizes hydrogeological knowledge of Northern Mendoza, from the Andes to the eastern plains. The study collected hydrogeological

An assessment of global groundwater quality is needed in response to the threats posed by anthropogenic and geogenic contaminants. This essay summarises the challenges involved, including a large number of potentially relevant water quality parameters, the poor availability of data in many regions and the complex nature of groundwater systems. Direct monitoring data can sometimes be augmented by indirect

Anisotropic fast-marching algorithms are computationally efficient tools for generating realistic maps of karst conduit networks, constrained by both the spatial extent and the orientation of karstifiable geologic units. Existing models to generate conduit network maps are limited either by high computational requirements (for chemistry-based models) or by their inability to incorporate the effects

The mechanisms associated with pumping-induced earth fissures have so far been unclear. To gain an insight into the mechanisms, a physical model test was conducted, which included a pumping well and a ridge of bedrock. There were two soil layers in the model box—the lower one was sand and the upper one was silty clay. When groundwater was pumped through the system, both pore-water pressure change and

Assessment of the level of activity of advective transport through faults and fractures is essential for guiding the geological disposal of radioactive waste. In this study, the advective flow (active, inactive) of meteoric water through fractures is assessed by comparing stable isotopes (δD and δ18O) between fracture and pore waters obtained from four boreholes in marine deposits in the Horonobe area