aquifer depth Articles
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Investigating and mapping spatial patterns of arsenic contamination in groundwater using regression analysis and spline interpolation technique
The present study investigates the hypothesis that arsenic concentrations correlate with tubewell depth, and examines the effectiveness of spline interpolation, specifically completely regularized spline (CRS) and spline with tension (SWT) in estimating the magnitude of arsenic contamination in groundwater in Thanh Tri, a densely populated district located in the southern part of Hanoi City, ...
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Land assessment for flood spreading site selection using geospatial information system
Irregular patterns of precipitations from temporal as well as spatial perspectives not only cause destructions but also waste surface water resources. Hence, controlling surface water and leading the flood to underground stores improve the efficiency of water usage. Selecting appropriate sites for optimal use of water floods is one of the most important factors in recharging underground water ...
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High fluoride drinking water in Gokwe, northwest Zimbabwe
More than 200 million people worldwide are exposed to excessive fluoride in drinking water. According to the World Health Organization, the optimal concentration range of fluoride in drinking water is 0.5 to 1.5 mg/L. Above this range, populations may contract dental fluorosis or, in severe cases, crippling skeletal fluorosis. In the Gokwe area in NW Zimbabwe, where drinking water contains up ...
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DOD Compares Benefits of Active and Semi-Passive Biobarriers
Current ESTCP demonstrations are examining design, construction, and performance elements of a semi-passive barrier at the Longhorn Army Ammunition Plant (AAP) in Karnack, TX, and those of an active barrier at the Navy Industrial Reserve Ordnance Plant (NIROP) in West Valley City, UT. DOD’s upcoming guidance manual for characterizing and remediating perchlorate-contaminated ground water will ...
By Redox Tech
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Denitrification during vertical upwelling at an alluvium–diluvium interface below the upland perimeter of a Riparian paddy
Received for publication May 4, 2008. Denitrification hotspots in riparian aquifers often develop in a relatively narrow zone at the upland–riparian interface, where nitrate-rich ground water of upland origin interacts with available soil organic carbon. In riparian paddy fields, denitrification in the aquifer has received less attention than that in the surface water and soil. This study aimed ...
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EOS Permeable reactive barriers successfully treat a large Trichloroethene plume - Case Study
Historical use of trichloroethene (TCE) and other chlorinated solvents at a former au-tomotive parts manufacturing plant in Indiana resulted in a large groundwater plume, stretching approximately 2 miles from the site. TetraTech GEO evaluated sev-eral remedial alternatives and selected enhanced in situ bioremediation to reduce contaminant concentrations and eliminate continued plume migration at ...
By Redox Tech
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Data Types in Environmental Data Management
ESdat is a specialist environmental database system; used to validate and import a broad spectrum of Environmental Data and to help users analyze and report it. ESdat can manage many types of environmental data including the following:Laboratory ResultsAutomated import of laboratory dataStore certified PDF copies of lab reportImport all QA data (blanks, duplicates,holding times etc..)Most ...
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Fold geometry model of Coyote hills segment of Puente hills blind-thrust system applied to interpretation of long-term water level data
Recent work by others along the Coyote Hills segment of the Puente Hills blind-thrust system has imaged the near-surface structural features generated by activity of that intrabasin fault. Published shallow seismic profiles near the south flank of the Coyote Hills indicate the blindthrust system is expressed by south-facing folding of Quaternary terrestrial sediments underlying the hills. ...
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The Future of Drinking Water
Predicted future growth in population numbers and rising sea levels mean demand for drinking water will continue to increase just as the natural availability of freshwater decreases. It is likely that brackish groundwater will be an important source of drinking water in the future, but the current methods used to produce fresh water from this source are expensive in terms of their energy use and ...
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BOS 200, Hydrocarbons Application at an Active Gas Station - Case Study
Abstract: Trap and Treat® BOS 200® was applied at an active gas station in Europe with elevated dissolved phase contamination and NAPL impacts to protect the primary aquifer and cut off the dissolved phase plume from migrating off-site. Over the course of 4.5 years of monitoring, 92.4-99.9% reductions in Benzene were achieved in the treatment area (replaced) monitoring wells. Validation ...
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Water quality dependence on the depth of the vadose zone in SAT-simulated soil columns
ABSTRACTThree soil aquifer treatment (SAT) columns were operated for five months to investigate the dependence of the treated water quality upon the depth of unsaturated vadose zone in terms of its organics, nitrogen and phosphorus contents. It was found that DOC removal was independent of the unsaturated vadose zone depth except during the initial flooding period when the effluent was injected ...
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Modelling of the impact of future climate changes on salt accumulation in paddocks of different soil types due to recycled water irrigation
Recycled water contains elevated amounts of salt compared with irrigation water originating from surface water sources. As such, recycled water, if used for irrigation over a long period of time may increase the root zone salinity. However, the phenomenon depends on variability of climatic condition and soil characteristics. In this study, a salt transport model, HYDRUS 1D, was used to ...
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Estimation of indirect nitrous oxide emissions from a shallow aquifer in Northern Germany
Received for publication July 14, 2008. Ground water is considered to be an important source for indirect N2O emissions. We investigated indirect N2O emissions from a shallow aquifer in Germany over a 1-yr period. Because N2O accumulated in considerable amounts in the surface ground water (mean, 52.86 µg N2O–N L–1) and corresponding fluxes were high (up to 34 µg N2O–N m–2 h–1), it was ...
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Potable water scarcity: options and issues in the coastal areas of Bangladesh
In the coastal areas of Bangladesh, scarcity of drinking water is acute as freshwater aquifers are not available at suitable depths and surface water is highly saline. Households are mainly dependent on rainwater harvesting, pond sand filters and pond water for drinking purposes. Thus, individuals in these areas often suffer from waterborne diseases. In this paper, water consumption behaviour ...
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Potential soil characteristics for riverbank filtration using 2-D ground resistivity in Kota Lama Kiri, Kuala Kangsar
Identifying the subsurface profile for riverbank/bed filtration (RBF) using conventional methods such as drilled boreholes is usually labor intensive, costly and acquires only 1-D profiling. Hence, a 2-D ground resistivity method was used as an alternative to obtain a 2-D subsurface profile by extending to 200 m length at Kota Lama Kiri, Kuala Kangsar, Perak site area. Four resistivity survey ...
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Application Spotlight: Denver CO uses magnetic resonance to manage aquifer storage and recovery (ASR)
Magnetic resonance (NMR) logging is well suited for helping manage aquifer storage and recovery (ASR) projects. An excellent example is this project in Denver Colorado, in which they used Vista Clara NMR borehole logging tools to characterize the Denver basin aquifer properties, especially hydraulic conductivity, for potential aquifer storage and recovery. The aquifers of interest are ...
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Chlorofluorocarbon (CFC) remediation case study 2002
Project Description The project site is located in Northern California and was leased and operated as a chemical storage and solvent recovery operation from late 1972 through April 1993. During an earlier period, the site may also have been used as a waste transfer station. Previous investigations indicate that soil and groundwater at the site, and groundwater down-gradient (westward) from the ...
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Storing Heat Underground
Underground thermal energy storage (UTES) is a system that uses inter-seasonal heat storage, storing excess heat from the summer for use in winter heating, and the cooling potential from winter for cooling in summer. A cost-effective, low-energy and low-risk proven renewable technology, UTES reduces carbon emissions by up to 60% and is becoming an increasingly popular choice for residential, ...
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Ethanol Production Plant Monitors Impacts to Water Supply and Stays in Compliance
Application Under current ethanol plant configurations, water use for ethanol production ranges from 4.0 to 6.8 gallons of water required per gallon of ethanol produced. With the average new plant producing 120 million gallons of ethanol per year, water yields in excess of 1,000 gallons per minute are required; therefore adequate water supply is essential to the operation of an ethanol production ...
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How to set up a groundwater monitoring test site
When it comes to groundwater monitoring, testing the water often requires the creation of a borehole at the test site to reach the water below. The process of creating a safe and secure site for everyone involved can sometimes be a lengthy process. The size of the borehole, which drill to use and the response zone are just a few of the considerations that will need to be taken into account ...
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