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R. K. Prasad ¹, N. C. Mondal ¹, V. S. Singh ¹

Affiliations
1 National Geophysical Research Institute, Hyderabad-500007, IN

Abstract

Groundwater resources potential has been evaluated in Kurmapalli watershed, Andhra Pradesh, India using Geographic Information System (GIS) technique. It allows manipulation and analysis of individual layer of spatial data. It is used for analyzing and modeling the interrelationship between the layers. Various thematic maps have been prepared for geology, geomorphology, slope, drainage-density and lineaments of the study area using GIS technique. These thematic maps have been integrated with the help of GIS. Appropriate weightage has been assigned to various factors controlling occurrence of groundwater to assess the total groundwater potential in each segment of the study area. The results show that there are five categories of groundwater potential ranging from very good to poor. The categorizations of groundwater potential zones are in general agreement with the available yield data of the 438 existing dug wells, bore wells and tube wells. This depicts the favourable prospective zones in the study area for evaluation of groundwater potential.

Keywords

Hard Rock Aquifer, Aquifer Yield, Evaluation of Groundwater Potential, GIS, Spatial Analyst Tool.

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D. V. Sarwade ¹, V. S. Singh ¹, S. C. Puranik ², N. C. Mondal ¹

Affiliations
1 National Geophysical Research Institute, Hyderabad - 500 007, IN
2 Kamatak University, Dharwad - 580 003, IN

Abstract

Estimation of aquifer parameters namely transmissivity (T) and storativity (S) are vital for the evaluation of groundwater resources. To estimate the accurate aquifer parameters, there are several methods (i e hydrograph analysis pumping test, etc). In Asian and Southeast Asian countries large diameter wells are abundant and they are often cost effective means to conduct pumping test as one can use the farmer's pump to perform this test. There are several suggested methods to estimate aquifer parameters through pumping test data, in which, curve matching and numerical methods are widely used. In this paper we have given special emphasis to pumping tests and data interpretation, which were carried out at 12 locations in a basaltic terrain at Belgaum city, Kamataka, India. The data is interpreted by using both analytical and numerical methods, and compared with them The results of analytical methods have shown up to 35% error involved in the calculated drawdown as well as residual drawdown in comparison with the field observations, whereas it is less than 45% m the case of numerical method Hence the present study shows that the numerical method IS found to be more accurate than the analytical curve matching method for estimating the aquifer parameters.

Keywords

Hydrogeotogy, Unconfined Aquifers Pumping Test, Analytical And Numencal Methods Transmissivity, Storage Coefficient, Belgaum City, Kamataka.

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N. C. Mondal ¹, S. Ahmed ¹

Affiliations
1 Aquifer Mapping Group, CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN

Abstract

Oozing of groundwater in Jodhpur city in the desert area of Rajasthan, India has caused weakening of foundations and cellars of buildings and shops. It has become more significant since 1996 when Kaylana lake was connected with Rajiv Gandhi Lift Canal (RGLC) water supply and filling of the lake had started. This has resulted in fear among dwellers about any future calamity. The hydrogeological, hydrochemical and isotopic studies clearly indicated that the lake water is responsible for the oozing phenomenon in the area. This article highlights a landscape entropy approach to assess pathways causing rise in the level of groundwater integrating the measured lake water level and groundwater table in a few selected wells in the city. With the fractional information of lake water and groundwater, marginal entropies of lake water and depths to groundwater in the selected wells sites are calculated. Mutual information, on common uncertainty associated in the measurements of lake water and groundwater, is also provided. Subsequently, ratios of mutual information to marginal entropy of the lake water are used as a measure for demarcating the pathways of weak zones, which correlate well with the lineaments delineated from satellite imagery. The results of this study represent a base for additional insight on future work, which will help in tracing the connectivity of weak zones causing oozing of water in Jodhpur city, and evolving a plan for remedial measures.

Keywords

Desert Area, Landscape Entropy, Marginal Entropy, Oozing of Water.

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N. C. Mondal ¹, V. P. Singh ²

Affiliations
1 NGRI, Hyderabad, IN
2 TAMU, Texas, US

Abstract

No Abstract.

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N. C. Mondal ¹, A. Bhuvaneswari Devi ², P. Anand Raj ², S. Ahmed ¹, K. V. Jayakumar ²

Affiliations
1 Aquifer Mapping Group, CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
2 Water and Environmental Division, Department of Civil Engineering, National Institute of Technology, Warangal 506 004, IN

Abstract

This article aims to establish an empirical relationship among geoelectrical properties of aquifer and hydrogeological parameters to estimate its hydraulic properties, and reduce the processes of pumping test, which are costly and time consuming. A total of 19 Vertical Electrical Sounding (VES) data were collected using Schlumberger configuration in a granitic terrain in Tamil Nadu. The geographical parameters were analysed with IX1-D v.3 Interprex software. The pumping test conducted on nearby open wells was also used. A cross-correlation test was ascertained between hydraulic conductivity (K) and aquifer resistivity (ρ). It was found that hydraulic conductivity is best defined as an exponential function of aquifer resistivity. The field parameters, A = 20.235 and B = 0.012, of the function were optimized by using 'Solver', with the least SSQ (=7.82) and MARE (=0.816). It helped to estimate hydraulic parameters along with an empirical equation without pumping test data. The results emphasized the potential of surfacial resistivity survey in granitic area to determine aquifer properties where well information is not available.

Keywords

Field Parameters, Granitic Terrain, Geoelectrical Properties, Hydraulic Conductivity, Shallow Aquifer.

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N. C. Mondal ¹

Affiliations
1 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN

Abstract

Entropy theory was used to estimate the vulnerability of groundwater aquifer to pollution which could have a degree of uncertainty of liable different dynamic systems. Mainly three parameters such as precipitation, groundwater level, and total dissolved solids in groundwater in a granitic area from Peninsular India are considered and tested. Results show that interaction entropy is comparatively higher in high risk vulnerability zone, whereas it is lower to negligible in low risk vulnerability areas. Therefore, the risk areas of groundwater pollution could be demarcated by virtue of interaction entropy, which provided the same outcomes as achieved on the DRASTIC map. The significance of this work is in evaluating the degrees of aquifer vulnerability for groundwater pollution. An aquifer vulnerability map could be prepared for the whole country by selecting suitable sites for the development of industries.

Keywords

Entropy Theory, DRASTIC Map, Estimation Aquifer Vulnerability, Groundwater Pollution, Peninsular India.

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