[1] In 2003–2005, systematic studies in four contrasting hydrogeologic settings were undertaken to improve understanding of source and transport controls on nitrate movement to public supply wells (PSW) in principal aquifers of the United States. Chemical, isotopic, and age tracer data show that agricultural fertilizers and urban septic leachate were the primary sources of large nitrate concent...

Abstract Mountain block recharge (MBR) mechanisms are an important component of the water budget for many alluvial aquifers worldwide. The MBR dynamics complex, difficult to constrain, and quantification is highly uncertain. These challenges magnified in data-scarce study areas, including Cul-de-Sac Leogane plains, two Haiti’s largest aquifers, which flanked by Massif de la Selle mountain block...

Recharge and contamination of karst aquifers often occur via the unsaturated zone, but the functioning of this zone has not yet been fully understood. Therefore, irrigation and tracer experiments, along with monitoring of rainfall events, were used to examine water percolation and the transport of solutes, particles, and fecal bacteria between the land surface and a water outlet into a shallow ...

The permeability of some karst aquifers consists of networks of poorly integrated conduits and dissolution-widened fractures. The flow includes conduit flow, especially during storm recharge, but lacks the focused recharge into single master conduits that occurs in more highly developed karst systems. The proportions of conduit and dispersed flow are difficult to quantify in such systems. This ...

The objective of this project was to investigate the current state of the practice with regards to karst detection methods and current karst construction practices and to recommend the best practices for use by the Virginia Department of Transportation (VDOT). A comprehensive review of literature available on the subject was conducted. Various karst detection technologies were summarized with r...

Strong karstlize effect forming surface and underground double-space structure in karst area, what resulting groundwater systems are extremely sensitive to outside interference. This article mainly focuses on the vulnerability assessment of karst groundwater, proposing that the vulnerability assessment of karst groundwater should be considered from three perspectives: the inherent vulnerability...

A quarter of the world's population uses groundwater from karst aquifers. range emerging organic contaminants (EOCs) are considered a potential threat to water resources and dependant ecosystems, aquifers most vulnerable systems anthropogenic pollution. This paper provides first global compilation (based on 50 studies) EOCs in explores EOC occurrence use understand systems. Of 144 compounds det...