Interstitial water, faunal samples, and hydrogeological data were collected beneath a riffle on the Speed River, southern Ontario, Canada. The purpose was to identify the location and seasonal fluctuation of the hyporheic/groundwater interface and to examine several aspects of water mass chemical signatures and the dynamics of the interstitial fauna. Concentration discontinuities in several wat...

Humans have exerted large-scale changes on the terrestrial biosphere, primarily through agriculture; however, the impacts of such changes on the hydrologic cycle are poorly understood. The purpose of this study was to test the hypothesis that the conversion of natural rangeland ecosystems to agricultural ecosystems impacts the subsurface portion of the hydrologic cycle by changing groundwater r...

Abstract This study is conducted in the northern Omdurman area to delineate groundwater potential zones using electrical resistivity method. most ancient city known as historical capital of Sudan. Geoelectric survey employing vertical sounding (VES) technique carried out explore availability area. The measurements were Schlumberger configuration. In this study, twelve VES points are measured al...

Submarine Groundwater Discharge (SGD) is an essential process of the hydrological cycle by hydraulically connecting land and sea. However, occurrence, importance effects SGD remain largely underexplored. Here, we developed validated a straightforward tool for mapping potential areas in coastal ecosystems Portugal. Our approach was based on premise that relatively cooler groundwater discharging ...

Federal, state, and local govermnent agencies are issuing more and more regulations to protect groundwater from microbial contamination. Regulations being proposed include the establishment of wellhead protection zones, drinking-water standards for viruses and parasites, and septic tank placement ordinances. Microbiologists are being called upon more frequently than ever to work with the engine...

Protection zones of shallow unconfined aquifers in The Netherlands were calculated that allow protection against virus contamination to the level that the infection risk of 10(-4) per person per year is not exceeded with a 95% certainty. An uncertainty and a sensitivity analysis of the calculated protection zones were included. It was concluded that protection zones of 1 to 2 years travel time ...

generally, alluvial basins of arid and semiarid zones are the places with excessive groundwater withdrawal, and also they have a high potential for land subsidence. excessive groundwater withdrawals have caused severe land subsidence in tehran, iran. at present, the maximum land subsidence rate is 36 cm/year, covering an area of nearly 530 km2. in the 2000s, as a result of economic and populati...

Groundwater levels rose (an average of 10m) (mostly in 1970’s and 80’s) due to irrigation induced recharge to the groundwater in Coleambally Irrigation Area (CIA). Water table depth rise was a direct result of the net amount of recharge over and above the regional groundwater outflow capacity. Control of net recharge through a range of options is critical to the sustainability of CIA and requir...