scholarly journals Supplemental Material: Influence of hydrostratigraphy on the distribution of groundwater arsenic in the transboundary Ganges River aquifer system, India and Bangladesh

2022 ◽  
Author(s):  
Madhumita Chakraborty ◽  
et al.
Keyword(s):  
Ganges River ◽  
Aquifer System ◽  
Groundwater Arsenic

Details of methodologies and data used for the study along with ancillary figures.

scholarly journals Correlation of electrical resistivity and groundwater arsenic concentration, Nawalparasi, Nepal

2004 ◽  
Vol 30 ◽  
Author(s):  
Tom H. Brikowski ◽  
Linda S. Smith ◽  
Tai-Chyi Shei ◽  
Suresh Das Shrestha
Keyword(s):  
Electrical Resistivity ◽  
Arsenic Concentration ◽  
Clay Content ◽  
High Resistivity ◽  
Great Promise ◽  
Ganges River ◽  
Predictive Tool ◽  
Groundwater Arsenic ◽  
Chemical Conditions ◽  
High Arsenic

The Asian Arsenic Crisis has expanded into the headwaters of the Ganges River, now including the plains (Terai) of Nepal. This study seeks a non-invasive predictive tool to estimate groundwater arsenic concentration prior to drilling, enabling "arsenic avoidance" in contaminated areas. Detailed chemical studies indicate that in Himalayan-sourced aquifers arsenic is released by microbially-mediated redox reactions. Likely hydrogeological settings for oxidizing chemical conditions (immobile arsenic) should be more porous (higher in filtration rate for oxygenated waters) and contain fewer fine organic sediments (oxygen-consuming material). Both conditions should yield higher electrical resistivity, and such aquifer heterogeneity effects should be most prominent in head water regions such as Nepal. To test this approach, a series of vertical electrical resistivity soundings were made near Parasi, Nepal, constituting a profile extending 2 km across a known high-arsenic area. Correlation of the horizontal and vertical distribution of measured resistivity and ENPHO groundwater arsenic measurements demonstrated a distinct inverse relationship between these variables. Out of 240 arsenic sample points, 75% of those extracted from high resistivity zones (>100 ohm-m, inferred lower clay content) exhibited arsenic <150 ppb. Conversely, 7S% of samples from low resistivity zones exhibited arsenic >150 ppb. Given these preliminary results, the resistivity technique appears to hold great promise as a predictive tool for finding low-arsenic groundwater zones within contaminated areas, thereby allowing "well-switching" from highly toxic to new safe or more readily treatable wells. The method should be applicable in most circum- Himalayan high-arsenic areas.

Hydrogeological and isotopic study of the multi-aquifer system of the Sibari Plain (Calabria, Southern Italy)

2016 ◽  
Vol 39 ◽  
pp. 134-137 ◽  
Author(s):  
Giovanni Vespasiano ◽  
Carmine Apollaro ◽  
Luigi Marini ◽  
Rocco Dominici ◽  
Giuseppe Cianflone ◽  
...  
Keyword(s):  
Southern Italy ◽  
Isotopic Study ◽  
Aquifer System

Using groundwater levels and Specific Yield to Estimate the Recharge, South of Erbil, Kurdistan Region, Iraq

2018 ◽  
Vol 7 (4) ◽  
pp. 191
Author(s):  
Sherwan Sh. Qurtas
Keyword(s):  
Unconfined Aquifer ◽  
Middle Part ◽  
Water Levels ◽  
Specific Yield ◽  
Aquifer System ◽  
Groundwater Levels ◽  
Monitoring Wells ◽  
Water Table Fluctuation Method ◽  
Recharge Estimation ◽  
Fluctuation Method

Recharge estimation accurately is crucial to proper groundwater resource management, for the groundwater is dynamic and replenished natural resource. Usually recharge estimation depends on the; the water balance, water levels, and precipitation. This paper is studying the south-middle part of Erbil basin, with the majority of Quaternary sediments, the unconfined aquifer system is dominant, and the unsaturated zone is ranging from 15 to 50 meters, which groundwater levels response is moderate. The purpose of this study is quantification the natural recharge from precipitation. The water table fluctuation method is applied; using groundwater levels data of selected monitoring wells, neighboring meteorological station of the wells, and the specific yield of the aquifers. This method is widely used for its simplicity, scientific, realistic, and direct measurement. The accuracy depends on the how much the determination of specific yield is accurate, accuracy of the data, and the extrapolations of recession of groundwater levels curves of no rain periods. The normal annual precipitation there is 420 mm, the average recharge is 89 mm, and the average specific yield is around 0.03. The data of one water year of 2009 and 2010 has taken for some technical and accuracy reasons.

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