aquifer system Articles

  • Aquifer storage & recovery

    Client: City of Wichita, Kansas  Completion Date: November 2001  Services Provided Program management Hydrogeological engineering Water quality monitoring Design criteria development Water accounting system Public information program Permitting agency reviews ...


    By Burns & McDonnell

  • Union county aquifer restoration

    Client: Union County Water Conservation Board  Completion Date: 2003  Services Provided 65-MGD river intake Mechanically cleaned bar screen Two traveling water screens Quarter-mile-long access bridge with service deck Four 15,050 gpm vertical turbine intake pumps 48-inch raw water ...


    By Burns & McDonnell

  • Modelling biological Cr(VI) reduction in aquifer microcosm column systems

    Several chrome processing facilities in South Africa release hexavalent chromium (Cr(VI)) into groundwater resources. Pump-and-treat remediation processes have been implemented at some of the sites but have not been successful in reducing contamination levels. The current study is aimed at developing an environmentally friendly, cost-effective and self-sustained biological method to curb the ...


    By IWA Publishing

  • pH and redox buffering systems of landfill leachate contaminated aquifer materials

    Introduction of landfill leachate into an aerobic aquifer leads to a variety of redox and pH buffering reactions between dissolved chemical species and aquifer sediments, which play profound effects on the behaviours of contaminants beneath and down gradient from the landfill. The specific objective of this study was to determine the spatial and temporal variations of pH and redox buffering ...


    By Inderscience Publishers

  • Mapping of freshwater aquifers case study

    Big Pine Key, Florida The Nature Conservancy is coordinating investigations to document the physical and biological changes that will occur on small oceanic islands as a result of sea level rise. Big Pine Key, FL is one of the primary areas of investigation because of extensive previous work and that a large portion of the island is a National Wildlife Refuge and therefore not subject to ...


    By GeoView, Inc.

  • Trends and transformation of nutrients and pesticides in a coastal plain aquifer system, United States

    Received for publication March 19, 2009. Four local-scale sites in areas with similar corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] agriculture were studied to determine the effects of different hydrogeologic settings of the Northern Atlantic Coastal Plain (NACP) on the transport of nutrients and pesticides in groundwater. Settings ranged from predominantly well-drained soils overlying ...

  • Assessing selenium contamination in the irrigated stream–aquifer system of the Arkansas river, Colorado

    Received for publication December 4, 2008. Prudent interventions for reducing selenium (Se) in groundwater and streams within an irrigated river valley must be guided by a sound understanding of current field conditions. An emerging picture of the nature of Se contamination within the Lower Arkansas River Valley in Colorado is provided by data from a large number of groundwater and surface water ...

  • Recharge areas and geochemical evolution of groundwater in an alluvial aquifer system in the Sultanate of Oman

    A regional hydrogeochemical model was developed to evaluate the geochemical evolution of different groundwaters in an alluvial aquifer system in the Interior of Oman. In combination with environmental isotopes the model is able to extract qualitative and quantitative information about recharge, groundwater flow paths and hydraulic connections between different aquifers. The main source of water ...


    By Springer

  • Integration of an analytic element model in a stochastic analysis of infiltration into a complex unconfined aquifer system

    ABSTRACT A hydrologic model based on the Analytic Elements Method (AEM) has been developed for a phreatic aquifer in the General Separations Area (GSA), of the Savannah River Site (SRS), South Carolina, USA. The AEM is a semi-analytical method that relies on the superposition of individual closed-form solutions of elements representing the main hydrologic features of a site. Our study adopts ...


    By IWA Publishing

  • Impact of climate variability on the salinization of the coastal wetland-aquifer system of the Po Delta, Italy

    Deltaic coastal areas are constituted by a patchwork of brackish lagoons and freshwater bodies; these coastal wetland-aquifer systems are fragile ecosystems that usually respond quickly to climate changes. To understand the hydrological processes occurring within the lagoons and the groundwater system of the Po River Delta (Italy), the contribution of both evaporation and anthropogenic factors ...


    By IWA Publishing

  • A transboundary aquifer of potential concern in Southern Africa

    Tuli Karoo transboundary aquifer (TBA) is shared between Botswana, South Africa and Zimbabwe in the Southern African Development Community (SADC) region. The TBA provides groundwater resources for various economic activities. Irrespective of the value offered by this TBA, there is very little research that has been conducted to improve understanding of the physical system and potential ...


    By IWA Publishing

  • Mapping of freshwater aquifers by GeoView case study

    Big Pine Key, Florida The Nature Conservancy is studying the physical and biological changes that will occur on small oceanic islands as a result of sea level rise. Big Pine Key, Florida is one of the primary areas of investigation because of extensive previous work on the key and because a large portion of the island is a National Wildlife Refuge. As part of the investigation, GeoView ...


    By GeoView, Inc.

  • Comparison of Reducing Agents for Dechlorination in a Simulated Aquifer (PDF)

    A simulated aquifer system (Aquifer Simulation Vessel – ASV) was used to study the efficacy of various reducing agents to assist microbial dechlorination. The soil samples are homogenized and the soil is packed into 6.0-foot long tubes with an internal diameter of 5.75 inches. Flow rates can be calibrated for flow at 0.1 to 2.0 feet/day. The system has a volume of 2025.44 in3.  A solution of ...


    By Regenesis

  • A GIS-based methodology to delineate aquifer recharge areas

    A GIS-based methodology to delineate risk areas for contamination of groundwater resources is presented by identifying recharge conditions to the aquifer. Identifying the recharge areas is based upon surface and subsurface geologic conditions that may control the risk of potential oil spill contaminants into the aquifer. This study uses the Chicot aquifer system in southwest Louisiana as a pilot ...


    By Inderscience Publishers

  • DOD evaluates bioaugmentation for remediating low-pH aquifers

    The US Department of Defense (DOD) has completed pilot-scale work on the 'MAG-1' site at Fort Dix, NJ, to test suitability of anaerobic bioremediation for an aquifer with low pH. Project results will be used to design full-scale ground-water treatment at MAG-1. In addition, technical criteria gained from the demonstration will be integrated into DOD’s remediation strategy for its many facilities ...

  • Impact of pre-treatment technologies on soil aquifer treatment

    This study investigates the impact of pre-treatment options on the performances of soil columns simulating soil aquifer treatment (SAT). For this purpose a conventional activated sludge (CAS) process, a membrane bioreactor (MBR) and vertical flow reed beds were used as single units or in combination before SAT. The influent and effluent from each treatment train were monitored over three ...


    By IWA Publishing

  • Assessment of water qualities and evidence of seawater intrusion in a deep confined aquifer: case of the coastal Djeffara aquifer (Southern Tunisia)

    Geochemical analyses of groundwater samples from the Djeffara confined aquifer (Southern Tunisia) were performed. The distribution of saline waters was investigated to identify the origin of the groundwater contamination. The aquifer was shown to be affected by an abnormal increase in groundwater salinity. Near the recharge zone, the groundwater salinity does not exceed 2.5 g l−1 but ...


    By IWA Publishing

  • Validation of two applied methods of groundwater vulnerability mapping: application to the coastal aquifer system of Southern Sfax (Tunisia)

    The coastal aquifers system of Sfax Agareb Chaffar Mahres (Southern Sfax) located in the central east of Tunisia is well known for population growth and industrial development. These industrial and agricultural developments have led to the degradation of water quality. In this study, DRASTIC and GALDIT models were integrated with geographical information system (GIS) tools, in order to assess ...


    By IWA Publishing

  • Stanford Researchers Link Aquifer Overdraft to Arsenic Contamination

    In a recent study, researchers used satellite data to establish a link between excessive pumping from California aquifers and dangerous arsenic concentration spikes in the groundwater of the Tulare Basin. This promises to be an important early warning system for the growing problem of arsenic contamination, which potentially threatens ...


    By Fluence Corporation

  • Modeling the groundwater recharge in karst aquifers by using a reservoir model

    The estimation of the groundwater recharge in a karstic system becomes an important challenge due to the great hydrodynamic variability in both time and space. This paper proposes a two reservoir conceptual model to simulate inflow into both the conduit system and the fissure network system based on the analysis of the spring hydrograph. The structure of the model and the governing equations are ...


    By IWA Publishing

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