Vertical groundwater groundwater flow aquifer water wells. Medical search. Frequent questions

To address this challenge, the Ibadan Hydrogeophysics Research Site was established in 2019 as the first field-scale hydrogeological research laboratory in Nigeria to advance understanding of the geologic, hydraulic, and hydrogeochemical variabilities within crystalline basement aquifers. (mdpi.com)
Horizontal flow barriers commonly correspond to mapped geologic structure and result in horizontal hydraulic gradients that progressively become steeper from north to south corresponding to an increase in structural complexity that may be impeding recharge from the uplands into the heavily developed areas. (usgs.gov)
This is consistent with the geologic interpretation of the Palouse Slope as being a gently folded structure created by voluminous sheet flows of CRBG lavas. (usgs.gov)
Deep bedrock wells are generally safe water supplies because they tap deeper aquifers that have natural geologic barriers in place that helps keep contaminants from entering the aquifer. (iowadnr.gov)
Mike Lowe has been with the UGS since 1989 and has been involved with geologic mapping projects, geologic-hazard assessments, and ground-water investigations. (utah.gov)
Subsurface geologic structures are a complex network of porous volcanic rock, impervious caprock and vertical dikes that restrict the flow of water. (hawaiifirstwater.org)
One of the goals is to map geologic structures and produce 3D models of the groundwater distribution of the aquifer. (hawaiifirstwater.org)
Diagram showing depth of each well and geologic interval each was completed in. (usgs.gov)
R oberts has developed detailed work plans for chlorinated VOC sites that employ accurate geologic and aquifer screening methods. (robertsenvironmental.net)
Along the way I've been fortunate to work directly and indirectly on many interesting studies of national and international relevance related to groundwater availability and sustainability, and the role of groundwater in geologic processes. (usgs.gov)

This was investigated through theoretical 2D groundwater flow and solute transport modelling, with a focus on low recharge environments (where diffusive transport is significant). (edu.au)
The final part of this thesis synthesizes these findings into a 3D regional groundwater flow and solute transport model of the Ti Tree Basin. (edu.au)
Additionally, the optimal tracer-aided model reflects dominant flow paths and connections of the hillslope and depression units, yielding reasonable source area apportionment for dominant hydrological components (e.g., more than ∼ 80 % of fast flow in the total discharge) and solute transport in the steep hillslope unit of karst flow systems. (copernicus.org)
It provides real seepage characteristics of groundwater movement and solute transport [ 14 , 15 ], as well as approximate aquifer models. (hindawi.com)
To assess the optimum level of complexity necessary in models of groundwater flow and solute transport in the Bengal Aquifer System (BAS), we explore a range of representations of the lithological heterogeneity using a multi-modelling approach. (port.ac.uk)
Burgess, William G. / Representing heterogeneity of fluvio-deltaic aquifers in models of groundwater flow and solute transport: a multi-model investigation in the Bengal Basin . (port.ac.uk)

You should read this web page if you consume water from a private water well that is finished in any shallow aquifer. (iowadnr.gov)
A well that obtains part or all of its water from a shallow aquifer can have higher levels of contaminants when compared to deeper wells in the same area. (iowadnr.gov)
The high temporal resolution sensor data show clear evidence of salty water from roadway drainage systems recharging the shallow aquifer and horizontal and vertical movement of salty water through the aquifer. (udel.edu)
This might be due to evaporation or halite dissolution with the upward flow of waters through the fractures from the deep aquifer of the Nubian sandstone to the shallow aquifer of the fractured Miocene limestone. (sav.sk)

Many farms and homes in Iowa obtain their water from bedrock wells. (iowadnr.gov)
But in some areas of our state, shallow bedrock aquifers exist. (iowadnr.gov)
In areas of Karst, much of the rainfall that would normally flow to rivers and streams, directly or indirectly flows into the shallow bedrock and becomes part of the groundwater some water wells may utilize. (iowadnr.gov)
Shallow wells located in areas of Karst bedrock can have poor water quality. (iowadnr.gov)
The darker shaded areas are those where sinkholes and bedrock exposures are most likely and water quality concerns are the greatest in shallow bedrock aquifers. (iowadnr.gov)
Karst bedrock aquifers are some of the most susceptible to contamination. (iowadnr.gov)
Little water moves through the unaltered bedrock. (uky.edu)
A multi-criteria model (GRTER), created as G (geology), R (resistivity), T (thickness of the aquifer), E (elevation) and R (bedrock relief) and groundwater occurrences (G), general lithology of the overlying strata (O) and depth to aquifer units (D) termed GOD index, were employed towards delineating the groundwater potential and aquifer vulnerability of Ilere Town, Ondo State, Southwestern Nigeria. (ftstjournal.com)
The fractured bedrock aquifer system consists of three sloping geohydrologic units: the Ordovician to Mississippian clastics, the Cambrian and Ordovician carbonates, and the Precambrian and Cambrian metamorphics and clastics. (vt.edu)

Groundwater discharge into the sediment-filled coulees, where the upper aquifers are intersected at land surface by incised canyons, is proposed as an alternative to explain local steepening of the hydraulic gradient along the Palouse Slope previously attributed to the presence of a groundwater dam. (usgs.gov)
Analysis of abundant data on hydraulic head, pressure, and water chemistry from water wells tapping the Wilcox, Carrizo, and Queen City aquifers reveals the regional ground-water circulation patterns, locations and mechanisms of major recharge and discharge areas, and evolution of ground-water chemistry. (utexas.edu)
A comparison of historical water-level data with new UGS measurements shows that ground-water discharge in excess of recharge since 1939 has lowered the ground-water surface in Cedar Valley by as much as 114 feet. (utah.gov)
The model tested contrasting configurations of passive storage in the fast- and slow-flow systems and was optimized using a multi-objective optimization algorithm based on detailed observational data of discharge and isotope dynamics in the Chenqi Catchment in southwestern China. (copernicus.org)
and 3) natural and human-induced perturbations in groundwater recharge and discharge. (usgs.gov)
Using complementary groundwater flow models, we could reproduce the observed groundwater age stratification and show that the 30 year lag in rejuvenation comes from return flow of groundwater at a subsurface discharge zone that evolves along the interface between two soil types. (slu.se)
By comparing the observed groundwater age stratification with a simple analytical approximation, we show that the observed lag in rejuvenation can be a powerful indicator of the extent and structure of the subsurface discharge zone, while the vertical gradient of the age-depth-relationship can still be used as a proxy of the overall aquifer recharge even when sampled in the discharge zone. (slu.se)
The single age stratification profile measured in the discharge zone, close to the aquifer outlet, can reveal the main structure of the groundwater flow pattern from recharge to discharge. (slu.se)

Furthermore, understanding the SW-GW interactions through available methods (seepage meter, heat tracer, and environmental tracer) is useful in watershed management, that is, risk management and assessment of the aquifer system. (intechopen.com)
Groundwater movement whether vertical (seepage, artesian) or lateral (Darcian, fracture flow) can have a very significant effect on long term operational BHE temperatures and therefore on the design and robustness of the BHE. (groenholland.com)
Seepage problems exist in water conservancy projects, groundwater research, and geological research, and hydraulic conductivity is an important factor that affects the seepage field. (hindawi.com)
Seepage deformation, hill creep, dam failure, and ground subsidence caused by groundwater exploitation are common effects of seepage flow. (hindawi.com)
This example calculates the groundwater volume balance raster as well as the flow direction and seepage velocity of an aquifer. (enterprisesoftware.pl)
1-3 for transect A-E) which are known to be a former gravel bar in groundwater seepage back into stream is much easier and the there is also about a 1meter difference almost immediately before the back piezometers, as there is a chute channel running in between. (enterprisesoftware.pl)

Permeability increases due to dissolving the entrapped air in soil into the percolating water. (wikipedia.org)
Joints and bedding planes tend to heal or become clogged, and although clay minerals have large intergranular storage of water, there is little or no permeability to allow its movement. (uky.edu)
The properties of the aquifer depend on the physical characteristics of the materials (porosity, permeability, specific yield, specific storage, and hydraulic conductivities) which are determined by techniques like resistivity surveys and pumping tests followed by remote sensing and geographic information system for better information on the groundwater system. (intechopen.com)
Thermal wells contain electrical heating elements operating at 400-700°C and can heat both high- and low-permeability media by a combination of TCH and thermally induced convection processes. (serdp-estcp.org)
Remediation experiments were then conducted in the 2-D and 3-D large-scale containers, with controlled release of DNAPL into lower permeability layers simulating aquitards beneath the water table. (serdp-estcp.org)
The generation of steam at a given location during the experiments was significantly affected by the energy intensity (a function of heater power and spacing), soil permeability, depth below the groundwater level, and the cooling effect caused by the groundwater flux. (serdp-estcp.org)
Lower permeability zones typically have higher water saturation and lower gas-filled porosity, which tends to inhibit air flow. (frtr.gov)

The goal of the present study is to investigate, delineate, and evaluate the shallow Miocene groundwater aquifer with vertical and lateral facies variations in the Gara oasis, western desert of Egypt. (sav.sk)
We incorporated a 2D groundwater flow model into the variable infiltration capacity (VIC) hydrological model code to address its lack of a lateral groundwater flow component. (nerc.ac.uk)
For the low transmissivity aquifer, increasing the grid resolution has a minimal effect as lateral groundwater flow is low, and the VIC grid cells behave as vertical columns. (nerc.ac.uk)
Groundwater movement can be lateral, initiated by pressure head differences within an aquifer (water bearing formation) over a certain distance. (groenholland.com)
What is the current vertical and lateral extent of the source material, and what is the potential for future migration based on the hydrogeologic characteristics of the site? (nationalacademies.org)
Equivalent freshwater heads were computed to investigate the transition from saline to freshwater zones in the San Antonio segment and evaluate the potential for lateral flow at the freshwater/saline-water interface. (usf.edu)
The Bulldog Shale, Oodnadatta Formation and lateral equivalents separate the upper and J aquifers and form the main confining beds for the GAB sequence. (bioregionalassessments.gov.au)
The J aquifer is an unconfined to confined artesian aquifer, comprising the Algebuckina Sandstone, Cadna-owie Formation and their lateral equivalents. (bioregionalassessments.gov.au)
b) heater system design factors such as aspect ratio (i.e., the ratio of heater length to heater spacing), the number of heaters, and their lateral and vertical positioning relative to the TTZ, and (c) vapor recovery system design factors such as the position of SVE wells and specifically their filter screens, negative pressure exerted, and recovery rate (especially for filter screens in the former saturated zone). (serdp-estcp.org)

Water-level measurements from 190 wells were used to develop a potentiometric-surface map of the east-central portion of the regional Great Basin carbonate and alluvial aquifer system in and around Snake Valley, eastern Nevada and western Utah. (usgs.gov)

During a reconnaissance investigation, the UGS found a 2.4-mile-long earth fissure that had formed in response to land subsidence caused by ground-water overdraft of the local aquifer. (utah.gov)
I have been engaged nationally and internationally in efforts to raise awareness and understanding of the inland and coastal subsidence caused by intense groundwater extraction. (usgs.gov)

No evidence of widespread ground-water contamination was found during this study. (usgs.gov)
No evidence of dissolved organic constituents was found in groundwater at the 10 sites sampled, and ground-water samples collected near the landfill showed no evidence of contamination from landfill leachate. (usgs.gov)
Shallow aquifers are more susceptible to contamination due to their close proximity to the ground surface and the influences caused by local land use activities. (iowadnr.gov)
Some of the water that originates at the surface - possibly near sources of contamination - flows undetected into the ground. (iowadnr.gov)
CSX, under EPD oversight, maintain the groundwater treatment system operating at the site and monitor the groundwater contamination plume to ensure that chemicals do not migrate off the site into the neighboring community. (cdc.gov)
CSX conduct periodic monitoring of indoor air and soil gas and take any necessary measures to protect the health of their workers, particularly as they relate to indoor air in buildings overlying the groundwater contamination plume and areas with extensive soil contamination. (cdc.gov)
The main risk and source of public outcry in the US has been the contamination of drinking water. (parliament.uk)
Contamination of groundwater resources by nitrate leaching under agricultural land is probably the most troublesome agriculture-related water contamination worldwide. (huji.ac.il)
R oberts has extensive capabilities and experience in delineating soil and ground water contamination. (robertsenvironmental.net)
Groundwater in alluvial terrain, supporting much of the global requirement for irrigation and domestic water, is at risk of sustained water level decline and/or contamination over large areas. (port.ac.uk)
SVE is applicable to the treatment of contamination located above the water table in unsaturated (vadose) zone soil. (frtr.gov)

Eocene stratigraphic units in the East Texas Basin are composed of a thick sedimentary sequence (approximately 2,000 ft [600 m]) of fresh-water aquifers and aquitards covering an area of approximately 15,000 mi 2 (51,000 km 2 ). (utexas.edu)
Water samples with anomalous chemical composition (compared with regional chemistry) indicate salt dome dissolution or anomalous hydrologic conditions, such as relatively high rates of recharge to the artesian part of the Wilcox-Carrizo through leaky aquitards. (utexas.edu)
The heterogeneity of hydraulic conductivity can objectively reflect the inherent fluctuation of water potential in the material distribution field and appear to avoid aquitards and strengthen the permeable layer [ 3 , 4 ]. (hindawi.com)

Groundwater (GW) belongs to all subsurface water, including saturated and unsaturated zones. (intechopen.com)
Through grid texture analysis, lineament detection, edge detection, thresholding, and identifying areas of structural complexity from the filtered residual reduced-to-pole magnetic anomaly map, it is possible to outline the fracture zones that principally control the groundwater aquifers and water flow in the area. (sav.sk)
Results show that one to three passive-storage zones distributed in hillslope fast-/slow-flow reservoirs and/or depression slow-flow reservoirs provided optimal model structures in the study catchment. (copernicus.org)
Electromagnetic (EM) flowmeter logs were collected under both ambient and stressed (pumping) conditions and were processed to identify vertical flow zones within the borehole. (usf.edu)
We found that spatially variable denitrification rates arise from the intersection of nitrate rich water with reactive zones defined by the abundance of electron donors (primarily pyrite). (hal.science)

Comparison of generalized potentiometric surface maps developed for pre-development conditions and post-2000 conditions indicate that pre-development groundwater flow was from the uplands toward the Columbia and Snake River and that post-2000 flow patterns in the area are controlled by irrigation practices that have resulted in broad regions of elevated or depressed hydraulic head. (usgs.gov)

The groundwater flow model was calibrated to well heads by changing the hydraulic conductivity. (huji.ac.il)
The groundwater flow model was calibrated using UCODE, a USGS code for universal inverse modeling. (vt.edu)

The Mediterranean basin contains many semi-arid environments where aquifers are subject to intensive exploitation, generally to meet irrigation demands. (mdpi.com)
In areas without flow barriers, dissimilarities in response of well groups over time resulted from the formation of groundwater mounds caused by recharge from irrigation or regions of decline caused by pumping. (usgs.gov)
In some cases, irrigation-related changes in head have reversed groundwater flow directions. (usgs.gov)
The recharge water for this well was from the excess overflow of an adjacent minor irrigation tank due to the record monsoon rains in Nov-Dec 2021. (heraldopenaccess.us)
The inclusion of the 2D groundwater model in VIC will enable the future representation of irrigation from groundwater pumping, and the feedbacks between groundwater use and the hydrological cycle. (nerc.ac.uk)

Spatial representation of the major groundwater flow systems in Idaho. (enterprisesoftware.pl)
When surplus nitrogen leaches as nitrate (a major groundwater pollutant) to the aquifer, complex flow dynamics and naturally occurring degradation processes control its transport. (hal.science)

However, an understanding of their local flow and transport processes and pathways is missing due to limited research. (mdpi.com)
Recover waste heat, i.e. the thermal energy indirectly produced as part of industrial processes, by household waste incineration plants, data centres, water treatment plants or nuclear power stations. (brgm.fr)
Better representations of groundwater processes need to be incorporated into large-scale hydrological models to improve simulations of regional- to global-scale hydrology and climate, as well as understanding of feedbacks between the human and natural systems. (nerc.ac.uk)
However, as more monitoring and other data become available, the various plausible site conceptual models should gradually converge into a single picture encompassing all salient fluid flow and material transport and transformation processes. (nationalacademies.org)
Site conceptual models are continually refined, possibly using computer models, to address site-specific complexities involving spatial and temporal variations in flow, transport, and transformation processes. (nationalacademies.org)
In this study, we developed a coupled flow-isotope model that conceptualizes both "fast-flow" and "slow-flow" processes in heterogeneous aquifers as well as hydrological connections between steep hillslopes and low-lying depression units in cockpit karst landscapes. (copernicus.org)
Since retiring from the USGS (after 40+ years of service) at the end of 2018 as a Research Hydrologist with the Earth Science Processes Division, Water Mission Area, I volunteer with the USGS as Scientist Emeritus. (usgs.gov)

With an understanding of the physical characteristics of adjoining aquifers and the modeling of water flow between and through the aquifer, decision makers will be equipped with better tools to manage the long term sustainability of Hawai'i's freshwater resources. (hawaiifirstwater.org)
The exchange of the chemical and physical characteristics in water will affect the quality of groundwater resources, hence leading to the availability of humans in terms of quantity [ 2 ]. (intechopen.com)
What are the lithology of the subsurface and groundwater flow characteristics as they pertain to the source zone? (nationalacademies.org)
As previously mentioned, with respect to groundwater extraction and therefore information concerning groundwater characteristics from the Pedirka Basin, groundwater extraction occurs exclusively from the Crown Point Formation. (bioregionalassessments.gov.au)
Information on the groundwater characteristics of the Purni Formation is extremely limited. (bioregionalassessments.gov.au)

Hydrogeologic measurement of fifty-two (52) wells, by measuring the column of water and static water level of all tested wells, was performed so as to identify groundwater flow direction. (ftstjournal.com)
I collaborate on hydrogeologic research with scientists internal and external to the USGS, and advise, collaborate with, and otherwise serve USGS Water Science Centers and other USGS Offices and Programs on hydrogeologic aspects of various earth-science projects and programs. (usgs.gov)

The distribution of groundwater ages with depth is a key feature of these flow dynamics. (slu.se)

Nathan was a valuable member of the IGS hydrogeology team, working closely with Mike Gannon on several groundwater investigation and modeling projects. (issuu.com)
Emerging hydrogeology research on groundwater movement and the identification and management of naturally renewable groundwater resources seek to address these critical challenges [ 1 , 2 ]. (hindawi.com)

As any groundwater drawdown alters the natural hydrogeological flow system and can consequently impact groundwater-dependent vegetation, surface streams, lakes, wetlands, and associated aquatic ecosystems, as well as springs and wells, the wise approach is to assess the potential hydrological and ecological impact of a tunnel before building it and take appropriate measures to minimize the impact [ 12 ]. (hindawi.com)
We use an array of geological information including drillers' logs (n = 589) and hydrocarbon exploration data (n = 11) across an area of 5000 km 2 as a basis for alternative representations of upscaled aquifer heterogeneity, characterising hydrogeological structure in a series of five groundwater models at increasing levels of complexity. (port.ac.uk)

The Wilcox-Carrizo aquifer system includes (1) an artesian (confined) section that is separated from the Queen City by the Reklaw Formation, a leaky aquitard, and (2) a water-table (unconfined) system where the Wilcox-Carrizo crops out along the west, north, and east margins of the basin. (utexas.edu)
As ground water flows from outcrop down the hydraulic gradient into the artesian part of the Wilcox-Carrizo aquifer, it is consistently altered chemically from an acidic oxidized calcium-magnesium-bicarbonate sulfate water to a basic reduced sodium bicarbonate water. (utexas.edu)
With respect to water quality, availability and existing extraction the Great Artesian Basin (GAB) is the most significant and extensive water resource in the region. (bioregionalassessments.gov.au)

In the situation where infiltration of water at an appropriate rate is needed, bioclogging can be problematic and countermeasures such as regular drying of the system are taken. (wikipedia.org)
Pretreatment of water by filtration or reducing the load of the system could delay the failure of the system by bioclogging. (wikipedia.org)
The main objective of this study is to evaluate the hydrodynamic effects that have occurred in the last century of anthropogenic activity in this aquifer system. (mdpi.com)
Each of the alternative strategies shall be evaluated in terms of feasibility, effectiveness, cost, time and difficulty to implement, and degree of consistency with local comprehensive plans and water management programs such as the coordinated water system plan, the water supply reservation program, and others. (wa.gov)
Well information and groundwater-level measurements for the Columbia Plateau Regional Aquifer System in Washington, Oregon, and Idaho, were compiled from data provided by the U.S. Geological Survey and seven other organizations. (usgs.gov)
These barriers divide the groundwater-flow system into several compartments with varying degrees of interconnection. (usgs.gov)
The Queen City aquifer is primarily a water-table (unconfined) system in which effects of topography create a series of local ground-water basins. (utexas.edu)
Groundwater system is very vital to humanity and the ecosystem. (intechopen.com)
The objective of this chapter is to discuss the characteristic and assessment of groundwater within the scope of vertical distribution of GW, types of the aquifer system, types of SW-GW interface, and SW-GW interaction at both local and regional scales. (intechopen.com)
this system stores thermal energy in soil or rock via dozens of vertical geothermal probes spaced a few metres apart and several dozen metres deep. (brgm.fr)
Can the flow system be described at the specific site and at a larger scale? (nationalacademies.org)
The goal of this study was to determine the impact of land use activities on the subsurface flow regime in the Upper Roanoke River Watershed in Virginia to determine the impacts of land use change on the subsurface flow system, and to provide a tool for future management decisions. (vt.edu)
Land use activities can impact the groundwater system in two ways. (vt.edu)
The volume of water recharging the groundwater system can be reduced due to an increase in low permeable areas. (vt.edu)
MODFLOW, the USGS, three-dimensional, finite-difference, groundwater flow model was used to develop a regional conceptualization of the flow system. (vt.edu)
The bottom two layers were used to simulate deep regional flow within the system and account for possible vertical flow that may be occurring through deep fractures. (vt.edu)
The calibrated recharge values indicate that approximately 28% of the total precipitation recharges the aquifer system. (vt.edu)
The Kodas, who run a startup consultancy, set up a basic rainwater storage and groundwater recharging system in their apartment complex by channelling rain pipes from the terraces into an underground sump or reservoir with a storage capacity of 100,000 litres. (livemint.com)
A sensor is an automatic system which switches on the pump when the water level in the tank is low, and switches it off when it is full. (livemint.com)
Since 1985, the U.S. Geological Survey (USGS), San Antonio Water System (SAWS), and other Federal and State agencies have conducted studies to better understand the transition zone. (usf.edu)
On the surface, Silver City's water system seems just that simple. (scdailypress.com)
Yes, the system itself is fairly simple, but keeping a sufficient volume of potable water flowing smoothly through a vast, underground, spiderweb-like distribution system is complex, requiring planning, maintenance and frequent monitoring. (scdailypress.com)
A computerized system known as a SCADA, or supervisory control and data acquisition system, allows for real-time monitoring of the number of gallons pumped each minute, as well as the supply present in each of the town's raw water and water storage tanks. (scdailypress.com)
This system also monitors the level of chlorine in the water, and sends out an alarm if the chlorine disinfection system malfunctions - triggering an automatic pager system which notifies utility maintenance staff. (scdailypress.com)
I am past Chair of the UNESCO Working Group on Land Subsidence and the ASCE Task Committee on Land Subsidence and have led many national and international workshops on monitoring, analyzing and modeling aquifer-system compaction and land subsidence. (usgs.gov)
These lines were created using my research data of hydraulic head values and elevation of the groundwater system. (enterprisesoftware.pl)
The availability of data is too limited to determine if these formations operate as a single homogenous flow system or as separate, discrete, aquifers. (bioregionalassessments.gov.au)
Nevertheless, an efficient NAPL recovery from the saturated zone by an overlying SVE system requires not only vaporization of the NAPL but also development of one or more contiguous flow paths via which the gaseous phase can travel towards and reach the unsaturated zone and the SVE recovery wells. (serdp-estcp.org)
We rank the models by comparing model outcomes of travel time with available data on groundwater age based on 14 C. The results demonstrate the importance of spatial heterogeneity and suggest the significance of incorporating vertical heterogeneity in model representations of the Bengal Aquifer System and similar spatially extensive fluvio-deltaic aquifers. (port.ac.uk)
SVE system configurations can include vertical and/or horizontal extraction wells as warranted by site-specific conditions. (frtr.gov)
Pilot studies should be performed to provide design information, including the relationship between extraction well airflow rates, vacuum required to achieve capture at targeted locations and depths, and contaminant mass removal rates, to optimize the system design. (frtr.gov)
The abundance of liquid water on Earth's surface distinguishes us from other bodies in the solar system. (pressbooks.pub)

The microbial biomass blocks the pathway of water in the pore space, forming a certain thickness of the impermeable layer in the soil, and it reduces the rate of infiltration of water remarkably. (wikipedia.org)
Evidence of significant vertical hydraulic gradients exists, although much of the aquifer thickness is affected by commingling of wells. (usgs.gov)
From the spatial map, the groundwater flow direction was delineated on the south and south-western sides of this study area may have volumetric increase in whole dimensions due to the gradual increase in thickness of limestone deposits towards the coast. (heraldopenaccess.us)
The trends of the lineaments and the topography indicate the ground water flow towards the east coast and may have volumetric increase in whole dimensions due to the gradual increase in thickness of limestone deposits towards the coast. (heraldopenaccess.us)
Our investigation focused on an evaluation of water-table decline and the distribution, thickness, and texture of basin-fill deposits in Cedar Valley-these are all critical components to land subsidence and fissure formation in the arid southwestern United States. (utah.gov)

The spatial distribution of hydraulic conductivity plays a fundamental role in the environmental assessment, evaluation of water resources, and groundwater pollutant purification. (hindawi.com)

In combination with borehole records or geophysical profiling of a borehole an estimate of the contribution or groundwater effects can be made. (groenholland.com)
Especially where aquifers are a groundwater resource or where strata with different groundwater quality (potable, salt, contaminated) are crossed within the borehole, environmental consideration dictates design. (groenholland.com)
Groundwater movement in a borehole can be detected using a geothermal response test capable of heating and cooling pulses. (groenholland.com)
In order to track groundwater pollution plumes at landfill sites, an in-situ borehole hydrochemical and hydrodynamic profile (BHHP) method was developed. (bvsalud.org)

This means you - as a well user - need to take the steps to ensure that your water supply is tested for the contaminants that may be present in your local area and inform yourself by understanding the analytical results provided by the testing laboratory. (iowadnr.gov)
This water can contain contaminants that are found on the land's surface and those not bound or utilized by the areas soils and land cover. (iowadnr.gov)
DPH evaluated past, current, and potential future exposure to contaminants of concern from surface water and sediment at the CSX site in Waycross, Georgia. (cdc.gov)
People in the Waycross community are not being exposed to CSX Rail Yard site-related contaminants in their drinking water, which is derived from municipal water obtained from the Floridan aquifer. (cdc.gov)
CSX, under EPD oversight, sample downgradient soil gas and shallow groundwater if site-related contaminants are once again detected in sentinel groundwater monitoring wells to determine the extent of downgradient contaminant migration and take measures to prevent contaminant migration into nearby residential area. (cdc.gov)
Enhanced in situ reductive dechlorination (ERD) is the process of modifying chemical, physical, and biological conditions in the aquifer to stimulate the microbial degradation of contaminants under anaerobic conditions to harmless end products (e.g., carbon dioxide [CO 2 ] or ethene). (frtr.gov)
Application of ERD is comprised of biostimulation and sometimes bioaugmentation to modify existing geochemical and biological conditions in an aquifer to facilitate degradation of contaminants (AFCEC, NAVFAC, ESTCP, 2004). (frtr.gov)
Consequently, contaminants present as a separate phase have already vaporized by the time that steam production due to boiling of water in the initially water-saturated aquitard layer begins. (serdp-estcp.org)
Subsurface flow dynamics steer the transport and transformation of contaminants, carbon, weathering products and other biogeochemistry. (slu.se)
Soil vapor extraction (SVE) involves the application of a vacuum in the vadose zone to induce the controlled flow of air and removal of volatile and some semivolatile contaminants from the subsurface. (frtr.gov)
The vapor is then recovered from the subsurface through extraction wells and is then treated aboveground to recover or destroy the contaminants. (frtr.gov)

Investigations associated with chlorinated VOCs require the development of a detailed work plan for both horizontal and vertical delineation of subsurface impacts, which often includes utilization of vertical aquifer screening ("VAS") methods. (robertsenvironmental.net)
Consequently, four groundwater pollution plumes of different types and different scales were identified in both horizontal and vertical directions within the depth of 0-50 m, and the various pollution sources for the detected pollution plumes were revealed. (bvsalud.org)

It also affects groundwater flow in the aquifer, such as ground source heat pumps, permeable reactive barriers, and microbial enhanced oil recovery. (wikipedia.org)
Discontinuities in hydraulic head between well groups were used to help infer the presence of barriers to groundwater flow such as changes in lithology or the occurrence of folds and faults. (usgs.gov)
In the Umatilla area, water levels from 286 wells were used to identify multiple areas of high hydraulic gradient that indicate vertical and horizontal barriers to groundwater flow. (usgs.gov)
An analysis of 1,195 wells along major flow paths and through the area of persistent groundwater-level declines indicates that barriers to flow are not as evident in this area as in Umatilla. (usgs.gov)
The Beetaloo's rock formations and the distance between the shale resources and groundwater provide natural barriers. (industry.gov.au)
In addition, the casing of wells through the aquifers provide further barriers between the recovery of petroleum resources and the groundwater systems. (industry.gov.au)

The maps developed using the measurements of aquifer resistivity and thicknesses were further used to create the groundwater potential map. (ftstjournal.com)
A geophysical investigation was conducted in Ayyankulam village, Tirunelveli District, Tamil Nadu, and India to identify the groundwater flow pattern of a recharge well using the magnetic and electrical resistivity method. (heraldopenaccess.us)
ArcGIS 10.3 was used to digitise various thematic maps, such as magnetic maps, resistivity maps, and water level maps. (heraldopenaccess.us)
Electrical Resistivity method involving Vertical Electrical Sounding (VES) have been used to evaluate the groundwater potential and aquifer protective capacity of the overburden units within Zion Estate area. (academicjournals.org)
Chandra studied the relationship between resistivity and hydraulic conductivity in India's Mahabharata aquifer by adopting electrical prospecting technology. (hindawi.com)

Block Island consists of a Pleistocene moraine deposit that includes meltwater deposits, till, sediment-flow deposits, and glacially transported blocks of Cretaceous strata and pre-Late Wisconsinan glacial deposits. (usgs.gov)
Most boreholes are to well below the groundwater table or intercept strata that are water bearing (aquifers). (groenholland.com)
Especially for larger BHE systems where strata with groundwater movement are anticipated, such aquifers with a groundwater gradient or tidal influence, it is worthwhile to conduct at GRT (Geothermal Response Test) that will quantify flow and to make an inventory of available data from local observation wells. (groenholland.com)
A BHE in strata with groundwater movement will exhibit a dampening effect on the temperature extremes. (groenholland.com)

A decrease in the infiltration rate under ponded infiltration was observed in the 1940s for studying the infiltration of artificial recharge ponds and the water-spreading on agricultural soils. (wikipedia.org)
In cooperation with DelDOT, DGS is monitoring groundwater at stormwater infiltration best management practice sites (BMPs) to characterize the fate and transport of chloride. (udel.edu)
The monitoring wells are installed in clusters finished at different depths and equipped with automated water level, temperature, and salinity monitoring sensors to characterize infiltration and salt movement. (udel.edu)
Groundwater chemistry data show that infiltration of salty water has significant impacts on the major ion and trace element composition of groundwater. (udel.edu)
Groundwater movement can also be vertical, caused by a pressure differential between water bearing formations in the ground or by water seeping downwards through infiltration by gravity. (groenholland.com)

Identifying the impacts on groundwater environment resulting from tunnel drainage and making a correct assessment before tunnel construction is essential to better understand troubles that would be encountered during tunnel excavation and helpful to adopt appropriate countermeasures to minimize the influences. (hindawi.com)
Though the impacts on groundwater resources of an area by underground excavation may be minimized by such planned constraints as preexcavation grouting and installation of an impermeable lining of the final excavation, such measures may not be efficient for avoiding claims of environmental impacts, particularly in areas of existing water shortages and/or marginal supplies [ 13 ]. (hindawi.com)

Dissolving of the entrapped air in soil into the percolating water is a physical cause for the increase in hydraulic conductivity. (wikipedia.org)
Deep soil sampling (10 m) was used to calibrate vertical flow and nitrogen-transport numerical models of the unsaturated zone under different agricultural land uses. (huji.ac.il)
The water table was coupled with the variably saturated VIC soil column allowing bi-directional exchange of water between the aquifer and the soil. (nerc.ac.uk)
The subsurface conditions that influence SVE effectiveness include soil lithology and heterogeneity, temperature, soil moisture and natural organic carbon content, and depth to groundwater. (frtr.gov)
The zone of adequate air throughput for vertical SVE wells is typically a few tens of feet for sandy/silty soil types and tens to over 100 ft for sand to gravel soil types (NAVFAC, 2001). (frtr.gov)

The J aquifer is a porous media sandstone aquifer which shows dual porosity behaviour at a local scale ( Fulton, 2013 ). (bioregionalassessments.gov.au)
Regionally, the J aquifer has reported porosities of between 10 and 29% (average of 23%) with an observed decrease in porosity with greater burial depth of the aquifer ( Radke, 2000 ). (bioregionalassessments.gov.au)

Our coupled flow-isotope model for karst systems provides a novel, flexible tool for more realistic catchment conceptualizations that can easily be transferred to other cockpit karst catchments. (copernicus.org)
Denitrification rates vary over orders of magnitude among sites within the same aquifer, complicating estimation of denitrification capacity at the catchment scale. (hal.science)
Chlorofluorocarbon (CFC)-based groundwater ages revealed an unexpected groundwater age stratification in a 0.47 km(2) forested catchment called Svartberget in northern Sweden. (slu.se)

The areas of focus for this analysis included the Umatilla area, Oregon, and the Palouse Slope/eastern Yakima Fold Belt in the Columbia Basin Ground Water Management Area (GWMA) consisting of Adams, Franklin, Grant, and Lincoln Counties, Washington. (usgs.gov)
At 20 of these locations, nested observation wells provide vertical hydraulic gradient data and information related to the degree of connection between basin-fill aquifers and consolidated-rock aquifers. (usgs.gov)
The vertical head differentials and the distribution of flowing wells indicate downward leakage over most of the basin and upward leakage only beneath the Trinity and Sabine Rivers. (utexas.edu)
Stormwater inlet pipes and the basin outflow weir are equipped with flow and salinity monitoring systems. (udel.edu)
Using nearly 300 well drillers' logs, we produced a map and simplified cross sections of Cedar Valley's basin-fill sediments that show a high percentage of fine-grained material (chiefly clay) that is particularly prone to compaction upon dewatering. (utah.gov)
Vertical profiles of 14C in groundwater in the Ti Tree Basin were then interpreted using 2D flow and transport models, with a spatially variable boundary condition for 14C. (edu.au)
Aquifers occur in all major basin sequences, though due to the significant burial depth there is a paucity of data associated with the Amadeus and Warburton basins where they underlie the Pedirka Basin. (bioregionalassessments.gov.au)
At a local scale, aquifers within the shallow Quaternary and Tertiary deposits, and the Crown Point Formation within the Pedirka Basin, also provide an important supply of stock and domestic groundwater. (bioregionalassessments.gov.au)
all groundwater infrastructure is located on the western edge of the basin in the NT. (bioregionalassessments.gov.au)
These include the Hamilton sub-basin, Tertiary paleovalley systems and Quaternary alluvial aquifers associated with the present day surface water drainage ( Figure 24 ). (bioregionalassessments.gov.au)
Where it overlies the Pedirka Basin the GAB consists of an upper sequence of Cretaceous marine clays, silts and shales known collectively as the Rolling Downs Group and a lower sequence of Cretaceous to Jurassic terrestrial sediments that form a significant aquifer unit (the J aquifer). (bioregionalassessments.gov.au)

Contaminated areas often show large spatial variability of nitrate concentration in wells. (huji.ac.il)
The output water and nitrate-nitrogen fluxes of the unsaturated-zone models were used as input data for a three-dimensional flow and nitratetransport model in the aquifer under an area of 13.3 km2 of agricultural land. (huji.ac.il)
Fluxes of water and nitrate-nitrogen below citrus orchards were taken from a previous study in the area. (huji.ac.il)
The nitrate-transport model, which was fed by the abovementioned models of the unsaturated zone, succeeded in reconstructing the average nitrate concentration in the wells. (huji.ac.il)
However, this transport model failed in calculating the high concentrations in the most contaminated wells and the large spatial variability of nitrate concentrations in the aquifer. (huji.ac.il)
Furthermore, based on observed reaction rates of the sequential reduction of oxygen and nitrate, we present a general framework to estimate the location and intensity of the reactive zone in aquifers. (hal.science)

2007). As hillslope runoff is regarded as a "water tower", often supplying agriculture in the depression, the development of hydrological models representing the hillslope and depression hydrological functionality is a necessary prerequisite for water resource management in cockpit karst landscapes. (copernicus.org)
This groundwater flow pattern provides information on the participation of groundwater in the hydrological cycle and indicates the lower boundary of hydrological connectivity. (slu.se)

This project arose because increasing chloride concentrations were observed in a number of groundwater-supplied public water systems in New Castle County. (udel.edu)
Water samples tested in the lab for chloride were compared to field-measured electrical conductivity to develop an empirical relationship between the two parameters. (udel.edu)
Maximum chloride in groundwater is more than 11,000 mg/L at the Summit Bridge site and nearly 4,000 mg/L at the Middletown site. (udel.edu)
Water from the Chloride tanks is gravity-fed to an intermediate tank on Swan Street, then pumped uphill to "W" Mountain and on to Pinos Altos. (scdailypress.com)
Furthermore, the BHHP method was validated using sampling test results of groundwater chloride and chemical oxygen demand at the surveyed landfill site. (bvsalud.org)

Karst is considered as the effective source of water storage and supplies 40 to 50% of the World's drinking water needs [2-5]. (heraldopenaccess.us)
However, the effectiveness of incorporating different conceptualizations of passive storage in models of complex karst flow systems remains poorly understood. (copernicus.org)
Karst areas cover extensive areas of the Earth's surface and provide important water resources. (copernicus.org)
For example, the karst region in southwestern China is one of the world's largest continuous karst areas, covering ∼ 540 × 10 3 km 2 over eight provinces and providing water resources for more than 100 million people (Chen et al. (copernicus.org)

In turn, the distribution of water table depths varied significantly as grid resolution increased from 1° to 0.05° for the medium and high transmissivity systems, resulting in changes of model-average fluxes of up to 12.3% of mean rainfall. (nerc.ac.uk)
There is currently no extraction from this formation and no published assessment of groundwater depths, bore yield or aquifer parameters. (bioregionalassessments.gov.au)
An overall groundwater age stratification, representative for the Svartberget site, was derived by measuring CFCs from nine different wells with depths of 2-18 m close to the stream network. (slu.se)

Aquifers are determined based on the absence or presence of water table positioning, that is, confined, unconfined, leaky aquifers and fractured aquifers. (intechopen.com)

Can the groundwater velocity and direction (and the spatial and temporal variation in both) be measured? (nationalacademies.org)
Meanwhile, the hydrodynamic indicators included flow direction and flow velocity of groundwater. (bvsalud.org)

Multiple-year water-level hydrographs are also presented for 32 wells to illustrate the aquifer system's response to interannual climate variations and well withdrawals. (usgs.gov)
We then investigated how variations in aquifer properties and grid resolution affect modelled evapotranspiration (ET), runoff and groundwater recharge. (nerc.ac.uk)

The Campo de Cartagena aquifer is a clear example from such a semi-arid environment, and its hydrodynamic effects have aroused great scientific interest. (mdpi.com)
These findings will be relevant to other arid environments, and to other tracers which are transported to groundwater through the unsaturated zone. (edu.au)
Arid climate and densely populated areas have combined in many parts of the world to create water shortages, which are projected to worsen in the coming years due to population growth and climate change. (pressbooks.pub)

We simulated nine idealised, homogenous aquifers with different combinations of transmissivity, storage coefficient, and three grid resolutions. (nerc.ac.uk)

The COGG Program includes drilling new wells when there is no existing infrastructure in a location where more robust information is needed about subsurface conditions between protected groundwater and oil and gas development activities. (usgs.gov)
The mass transfer process is influenced by several properties of the contaminant and subsurface conditions, as well as the magnitude of the applied vacuum. (frtr.gov)

The goal is to characterize the potential risks to groundwater quality from de-icing practices at both DelDOT-managed and shared-use (receiving runoff from roadways, businesses, schools, etc.) stormwater management sites. (udel.edu)
The use of cross-hole slug test data to characterize aquifer heterogeneity and source/observation well oscillation parameters is evaluated. (osti.gov)

Groundwater flowing through fractures and solution openings is easily contaminated. (uky.edu)
Groundwater flows through openings between sand grains and along fractures (widely spaced cracks). (uky.edu)
Wells completed in shales are commonly adequate for domestic supplies, depending upon the occurrence of weathered fractures in the shale. (uky.edu)

Crystalline basement aquifers are important drinking water sources in Nigeria and several sub-Saharan African countries. (mdpi.com)
Due to fluid drainage and pore pressure changes following tunnel construction, vertical settlements with magnitudes reaching 12 cm were measured in fractured crystalline rock several hundred meters above the Gotthard highway tunnel in central Switzerland [ 10 ]. (hindawi.com)
Because it is impractical or impossible to access the subsurface to directly quantify denitrification rates, reactivity is often assumed to occur continuous along flowlines, potentially resulting in substantial over- or underestimation of denitrification.Here we investigated denitrification in an unconfined crystalline aquifer in western France using a combination of common tracers (chlorofluorocarbons, O2, NO3-, and N2) measured in 16 wells to inform a time-based modeling approach. (hal.science)

In southern Bangladesh excessive arsenic (As) in shallow groundwater has led to deeper groundwater becoming the preferred alternative source of potable water. (port.ac.uk)

Through the 'Ike Wai project, scientists will apply the field sensor data and the latest geophysical tools to help refine existing models of these aquifers, but that is just the start. (hawaiifirstwater.org)
Geophysical and well construction information for wells drilled by the USGS are published in the USGS GeoLog Locator . (usgs.gov)
After total hole depth was attained, geophysical log surveys were completed, and the monitoring wells were installed. (usgs.gov)
Hydraulic head and geophysical log data were used to calculate equivalent freshwater heads and then analyzed to identify possible horizontal gradients across the transition zone and thus flow. (usf.edu)

The water table is a subdued reflection of the land-surface topography and flow is generally from the central, topographic highs toward the coast. (usgs.gov)
Once in the ground, this water that was once on the surface becomes part of the groundwater supply. (iowadnr.gov)
Past and current exposures to chemicals in the surface water and sediment in the Waycross Canal are not likely to harm the health of children and adults who made wade or play in the area. (cdc.gov)
Surface drainage and stream flow pattern were decided and controlled by the topography and the subsurface geology. (heraldopenaccess.us)
The water cycle of the islands seems straightforward, but once the water moves from the surface to the subsurface its path to the aquifer can be complex. (hawaiifirstwater.org)
The committee should also consider the risk of extracting g 1 billion gallons of water from the surface water of the potential gas field in Lancashire. (parliament.uk)
This paper is aimed to determine the surface water quality in an around Sylhet City. (academicjournals.org)
We used surface water for our keen purpose. (academicjournals.org)
Surface water as well as ground water has been contaminated by humans. (academicjournals.org)
This revealed mountain front recharge, as well as recharge from ephemeral surface water to be important mechanisms. (edu.au)
and (4) Groundwater flow divides correspond to surface-water flow divides. (vt.edu)
Each horizontal well is then 'fracked' and the gas then flows to the surface. (industry.gov.au)
Up to 50% of the injected water returns to the surface as flowback water. (industry.gov.au)
I wanted to create a water table surface from water elevations in wells throughout my study area and stream elevations. (enterprisesoftware.pl)
Note 1: Although the watertable is ubiquitous across the landscape and is commonly represented by groundwater in Cenozoic formations, this surface does not necessarily imply continuous groundwater movement between formations, nor is it completely restricted to Cenozoic formations. (bioregionalassessments.gov.au)
About 70% of Earth's surface is covered by oceans and approximately half of Earth's surface is obscured by clouds (also made of water) at any time. (pressbooks.pub)
Bar chart Distribution of Earth's water including total global water, fresh water, and surface water and other fresh water and Pie chart Water usable by humans and sources of usable water. (pressbooks.pub)

Prior to joining the UGS, he worked as a well-site geologist in the petroleum industry in Texas from 1981 to1982, and was County Geologist for Davis and Weber Counties from 1985 to 1989. (utah.gov)
This makes it highly unlikely that there will be any movement of the petroleum resource into groundwater systems. (industry.gov.au)

These shales are easily excavated and restrict groundwater movement. (uky.edu)
These rocks are easily excavated and generally restrict groundwater movement. (uky.edu)
CSX establish a deed restriction to limit site use to commercial/industrial purposes and to restrict site groundwater use for purposes other than monitoring. (cdc.gov)

These formations have some limited potential as aquifers, but the high clay content generally blocks small conduits in the limestone. (uky.edu)
Erodable limestone, dolomite and marble formations provide a way for the subsurface flow of water with typical subsurface geological conditions. (heraldopenaccess.us)
The behaviour of groundwater within the Crown Point and Purni formations is poorly characterised. (bioregionalassessments.gov.au)

We look forward to better understanding of our islands' aquifers to begin the process of conserving our vital freshwater resources. (hawaiifirstwater.org)
The project consists of a team of scientists, economists, educators as well as stakeholders in the community that will come together as a multidisciplinary collaboration between members from the University of Hawai'i School of Ocean and Earth Science and Technology, Hawai'i Institute for Geophysics and Planetology (HIGP), Hawai'inuiākea School of Hawaiian Knowledge, the UH Economic Research Organization (UHERO), Dept. of Information and Computer Science and the Water Resources Research Center. (hawaiifirstwater.org)
Devin L Galloway is a Scientist Emeritus Research Hydrologist for the USGS Water Resources Mission Area. (usgs.gov)
Access to clean water resources is a current global problem. (hindawi.com)
Important, local scale water resources occur in shallow, disconnected Cenozoic aquifers. (bioregionalassessments.gov.au)
Water, air, and food are the most important natural resources to people. (pressbooks.pub)
Although rivers and lakes are the most heavily used water resources, they represent only a tiny amount of the world's water. (pressbooks.pub)

Where limestone content exceeds 60 percent, wells may yield adequate water for a domestic supply. (uky.edu)

Layers of low hydraulic- conductivity material impede vertical flow, creating steep vertical gradients. (usgs.gov)
These sites can yield new insight on vertical profiles of water quality, groundwater flow, aquifer layers that may impede groundwater flow, and changes in aquifer conditions over time in response to recharge and well pumping. (usgs.gov)

Assessment of water quality in Noyyal River from 20/12/2010 to 27/12/2011 was carried out in this study. (academicjournals.org)
Then, an evaluation is made using fuzzy comprehensive assessment method, with a result showing that it had influenced the local groundwater environment at a moderate degree. (hindawi.com)

Recent (2007-2010) drilling by the Utah Geological Survey and U.S. Geological Survey has provided new data for areas where water-level measurements were previously unavailable. (usgs.gov)

Each gas well uses a vertical drillhole into the shale rock, with a horizontal well drilled off the main vertical shaft. (industry.gov.au)
Figure 3 shows a geological cross section schematic of a shale gas well. (industry.gov.au)
Figure 3 source: CSIRO report into the shale gas well life cycle and well integrity (2017). (industry.gov.au)

Areas where insufficient data exists to define the nature and extent of existing or potential groundwater problems shall be documented. (wa.gov)
If necessary, alternative data collection and analysis programs shall be defined to enable better characterization of the groundwater and potential quality and quantity problems. (wa.gov)
This map, therefore, suggests that the groundwater potential and aquifer vulnerability index of Ilere town is moderate. (ftstjournal.com)
During 2010 and 2011, the USGS, in cooperation with SAWS, conducted a study to further assess the potential for movement of the transition zone in part of the San Antonio segment of the Edwards aquifer. (usf.edu)
It is worth noting that the majority of wells are used for stock water supply and the estimated well yield generally reflects the water requirement rather than the true yield potential of the aquifer. (bioregionalassessments.gov.au)
Data regarding MSW regulations, its generation rate and composition, as well as data regarding relevant aspects of the Nigerian energy market and its regulations and Nigeria's climate change policies are evaluated in order to determine the potential for successful implementation of a Landfill gas to energy project in the Olusosun dumpsite in Lagos, Nigeria. (lu.se)

These deposits yield large volumes of water where aquifers are extensive. (uky.edu)
In areas where the unit is sandy, wells more commonly yield sufficient water for a domestic supply. (uky.edu)
During the construction of Pinglin tunnel in Taiwan, the major difficulties encountered are caused by sudden high-pressure groundwater inflow, with a yield of approximately 180 L/s in the pilot tunnel as an example, leading to the TBM being trapped and damaged and construction progress being greatly impacted [ 9 ]. (hindawi.com)

Septic drain fields are also susceptible to bioclogging because nutrient-rich wastewater flows continuously. (wikipedia.org)

2) A problem definition section that discusses land and water use activities potentially affecting the groundwater quality or quantity of the area. (wa.gov)
The section should analyze historical trends in water quality in terms of their likely causes, document declining water table levels and other water use conflicts, establish the relationship between water withdrawal distribution and rates and water level changes within each aquifer or zone, and predict the likelihood of future problems and conflicts if no action is taken. (wa.gov)
The discussion should also identify land and water use management policies that affect groundwater quality and quantity in the area. (wa.gov)
Good quality drinking water is one of the building blocks for good health. (iowadnr.gov)
Understanding your drinking water quality can help protect the health of you and your family. (iowadnr.gov)
Even older wells finished in currently safe aquifers can be affected when steel well casing used in the well's construction corrodes and the casing develops small leaks that allows poor quality shallow groundwater to enter the well. (iowadnr.gov)
Wells completed in coals, or obtaining flow from coals, are highly productive, but water quality may be marginal or poor. (uky.edu)
The groundwater quality and quantity are examined hydro-geochemically through nine groundwater samples that were gathered from wells and springs distributed throughout the area around Gara Lake. (sav.sk)
The presence, quality and movement of groundwater can have a significant effect on the long term thermal behaviour of a BHE installation. (groenholland.com)
Monitoring data from the sites, such as water levels and water quality, are published in the NWISWeb . (usgs.gov)
To ensure continuous, sufficient flow of high-quality drinking water, well checks and maintenance are required daily. (scdailypress.com)
Motors are checked, vertical turbine pumps must be pulled and inspected on a regular basis, and water quality sampling and analysis occurs several times each month. (scdailypress.com)
Hydraulic conductivity is a key factor that characterizes the quality of an aquifer. (hindawi.com)
Large proportions of rainwater and snowmelt infiltrate into the subsurface before contributing to stream flow and stream water quality. (slu.se)

A water level indicator was used to measure groundwater levels in open wells and bore wells as well as delimit groundwater dynamics in the area. (heraldopenaccess.us)

Modelling Groundwater Flow Direction Using ArcGIS. (enterprisesoftware.pl)
I would imagine ArcGIS Spatial Analyst or maybe Geostatistical analyst could perform this function as well. (enterprisesoftware.pl)
I'm trying to determine a way to accurately produce groundwater contours in ArcGIS. (enterprisesoftware.pl)

Organisms2

Diseases1

Chemicals and Drugs17

Phenomena and Processes9

Disciplines and Occupations3

Technology, Industry, Agriculture2

Health Care13

Geographicals1

Geologic10

Solute transport6

Shallow aquifer4

Bedrock9

Discharge8

Seepage6

Permeability7

Lateral9

Alluvial aquifer1

Subsidence caused2

Contamination11

Aquitards3

Zones5

Potentiometric1

Model was calibrated2

Irrigation5

Major groundwater2

Processes7

Characteristics5

Hydrogeologic2

Distribution of groundwater1

Hydrogeology2

Hydrogeological2

Artesian3

System32

Thickness5

Pollutant1

Borehole4

Contaminants11

Horizontal and vertical2

Barriers6

Resistivity5

Strata4

Infiltration5

Impacts2

Soil5

Porosity2

Catchment3

Basin11

Nitrate6

Hydrological2

Chloride5

Karst4

Depths3

Leaky1

Velocity2

Variations2

Arid3

Homogenous1

Subsurface conditions2

Characterize2

Fractures3

Crystalline3

Potable water1

Geophysical4

Surface17

Petroleum2

Restrict3

Formations3

Resources7

Limestone1

Impede2

Assessment2

Geological Survey1

Shale3

Potential6

Yield3

Susceptible1

Quality14

Dynamics1

ArcGIS3