Elango Lakshmanan

Indian Institute of Technology Madras | IIT Madras · Department of Civil Engineering

In India, the quality of groundwater in the Amaravathi basin was thoroughly examined using the DWQI and IWQI. DWQI follows WHO standards, while the IWQI assesses water suitability for consumption, irrigation, and farming. High levels of F and NO 3 have a detrimental impact on health and were evaluated using USEPA models for infants, children, and a...

Temperature can be used as a tracer to characterize vertical recharge rates of fluids through soil. The objective of the present study is to estimate the groundwater recharge from a percolation pond using temperature as a tracer and to assess the temporal and spatial variation on the effect of clogging. Temperature data from different depths at the...

Floods and droughts are becoming common and concurrently occurring in different parts of the world due to changing global climate. Innovative and sustainable water management strategies are necessary to overcome the issues of flooding and drought, especially in large urban regions. This study aims to use abandoned quarries as an innovative and sust...

High concentration of trace elements in groundwater poses more health risks to humans by drinking groundwater and dermal contact. This work aimed to assess the trace element concentration in groundwater, water quality for drinking purposes, and its effect on human health upon prolonged consumption. The study was carried out in the gneissic terrain...

This book provides an overview of technical sustainable water management in the Global South, mainly in India, and is structured in five sections: The current status and challenges for sustainable water management in IndiaNew-age materials for water and wastewater treatmentNew technologies for water and wastewater treatmentSensors for water quality...

Water is one of the most essential commodities for mankind, and the largest available source of fresh water lies underground. This is an important Special Issue for researchers of hydrogeology and hydrogeophysics and a valuable reference for practicing geologists, hydrologists, geophysicists, and others who professionally use hydrological and hydro...

The gap between water supply and demand is increasing in several urban clusters of the world. This study uses the water evaluation and planning model to assess the water supply and demand dynamics in one of the large metropolitan regions of the Chennai hydrological basin. The primary water supply sources, including reservoirs, groundwater, inter-ba...

Sustainable groundwater management is vital under changing climate conditions in the world, and it is essential to focus on both mitigation and adaptation measures to overcome this threat. The impacts of climate change on groundwater resources, including changes in precipitation, evapotranspiration, recharge, and quality, are discussed in this chap...

Understanding the interactions between river water and groundwater is crucial for the better management of water resource problems. The present study was carried out to assess the river water and groundwater interaction in parts of the lower Cauvery river basin. The samples were collected from river water and groundwater from May 2018 to August 202...

The role of rivers in global carbon cycles are important, especially in regard to the dissolved carbon dynamics and its variability for shorter period timescales. The contribution of non-perennial rivers on global carbon cycle has not been understood clearly, where the environmental controls on dissolved carbon in such rivers is not yet defined. He...

The quality of groundwater is of utmost importance, as it directly impacts human health and the environment. In major parts of the world, groundwater is the main source of drinking water, hence it is essential to periodically monitor its quality. Conventional water-quality monitoring techniques involve the periodical collection of water samples and...

Data-driven models based on artificial intelligence are efficiently used to solve complex problems. The quality of groundwater is of utmost importance, as it directly impacts human health and the environment. In major parts of the world groundwater is the main source of drinking water, it is essential to periodically monitor water quality. Conventi...

Ant-inspired metaheuristic algorithms known as ant colony optimization (ACO) offer an approach that has the ability to solve complex problems in both discrete and continuous domains. ACOs have gained significant attention in the field of water resources management, since many problems in this domain are non-linear, complex, challenging and also dem...

Degradation of water quality is a major challenge in both developed and developing countries since it poses a great risk to ecological health. The Cauvery river is one of the most important rivers of southern India, where the effect of seasonal variation on the quality of river water and its adjoining groundwater on the lower part of the basin has...

The presence of uranium in groundwater is a cause of concern all over the world. In mineralized regions where elevated concentrations of uranium are possible in groundwater, mining activities can further degrade the water quality. Hence, it is essential to document the baseline uranium concentration in groundwater before the commencement of mining....

Fluoride contamination in drinking water is a serious public health concern across the world, and more than 90 million people in India are affected by health risks associated with fluoride. Though the fatality due to fluoride chronic toxicity is uncommon, the exposure to fluoride at different concentration levels shows various adverse health effect...

Climate change and the increase of agricultural production affects coastal aquifers around the world. Groundwater is the major source of irrigation in most of the coastal parts of India. Seawater intrusion is affecting the area just north of Chennai city as a result of over-extraction of groundwater for agricultural and drinking water supply to Che...

Increasing urbanisation and dependency on groundwater in the coastal regions has increased the vulnerability of the coastal aquifer to seawater intrusion. The objective is to understand the variation in vulnerability to seawater intrusion with response to change in groundwater level in the coastal region of Sankaraparani river basin located in the...

The objective of this study is to assess the impact of climate change induced rainfall, sea level rise, and urbanization on a fragile coastal aquifer. This study was carried out in one such an aquifer located in Southeast India. Downscaled climate projection was carried out using the regional climate model (RCM) with seven ensembles and the best ma...

Assessment of groundwater chemistry of a region is important to determine its usability. The objective of this study is to understand the hydrochemistry and groundwater quality especially with respect to fluoride in the Perambalur District, Tamil Nadu, India where groundwater is used without treatment for drinking and agricultural purposes. Groundw...

Overextraction of groundwater from coastal aquifers results in seawater intrusion causes immense threat to groundwater resources. The objectives of this study are to delineate the coastal regions affected by seawater intrusion along the east coast of India and to estimate the quantum of groundwater resources affected by seawater intrusion. The grou...

Groundwater is vital in Chennai Metropolitan Area, and thus its sustainable management is essential. This study aims to estimate groundwater recharge in the Chennai River basin (CRB) using an empirical method, a rainfall infiltration factor (RIF) method, a geographical information system (GIS)-distributed model, and the water table fluctuation (WTF...

Human civilisation has evolved generally along the banks of rivers in most of the regions around the world. Over the years, the population living along the rives have grown rapidly and several such regions have been highly urbanised. Further, several industries requiring a large amount of water are also located along the rivers. These activities al...

Groundwater depletion is one of the most critical concerns for users and policymakers. Identifying groundwater potential (low to high) helps properly plan the available groundwater resource. This study has used the possibilities of a geographical information system (GIS), remote sensing and, of course, field data to delineate the groundwater potent...

The surface water is a significant feature in the hydrological system and is a vital compound for life growth. Assessment of trace elements in the water bodies is essential since it poses huge threats to aquatic organisms and humans if present in high concentrations. This study was carried out to assess the seasonal changes in the dissolved trace e...

Groundwater recharge estimation is essential for sustainable water management and water supply schemes. In this paper, we review groundwater recharge estimation techniques and identify the appropriate methods by considering India’s hydrological and climatic conditions. Significant components of recharge, factors affecting groundwater recharge, aqui...

A three-dimensional variable-density finite element model was developed to quantify the impact of groundwater over use on submarine groundwater discharge (SGD). The model was applied to the Arani-Korttalaiyar river basin, north of Chennai, India. This region has an upper unconfined and lower semi-confined aquifer extending up to 30 km inland from t...

The present research deals with the Risk assessment of groundwater quality around 15 km radius surrounding SIPCOT industrial estate, Perundurai, Erode district. It is sub-divided into three segments with radius of 5 km each. 79 groundwater samples were collected from domestic and agricultural usage open and bore well points equally distributed (eac...

Uranium naturally occurs in groundwater and its concentration is mostly controlled by the geology of an area. The regular human consumption of groundwater with uranium causes health effects and hence the assessment of radiological and chemical toxicity effects on humans is essential. Hence, the present study was carried out to assess the general hy...

The objective of this research is to investigate the best management options for mitigating seawater intrusion through real-time coupling between rainfall–runoff, infiltration, surface water and groundwater system. The amount of runoff and discharge from sub-catchment after rainfall was first simulated by the rainfall–runoff model. This simulated d...

Rivers engage in carbon cycle by transporting the dissolved products of weathering of rocks to the oceans, and this process is sensitive to the global climatic changes. The present study was carried out with an objective of estimating the spatial and temporal variation in carbon consumption due to rock weathering in Cauvery, which is a major non-pe...

The DRASTIC index, used to assess the vulnerability of aquifers to contamination, has been subject to various adjustments to improve its reliability. These adjustments include adding and/or eliminating certain aquifer factors and modifying the factor weights. Nonetheless, there is no consensus about which factors, or their respective weights, are m...

Multi-layered coastal aquifers are complex aquifer systems with two or more aquifers divided by the impermeable or semi permeable layers. The objective is to assess the interaction between the aquifers using geochemical indicators in the urbanised multi-layered coastal aquifer of Sankaraparani river basin, India. Hydrogeologically, the coastal part...

The purpose of this study is to understand the impact of coastal groundwater over-exploitation on the variations in submarine groundwater discharge (SGD) flux rate and seawater exchange flux across the seabed. As a case study, numerical modelling techniques were applied to a complex multi-aquifer system located north of Chennai, India, which has be...

Assessment of rainfall variability and drought is essential to address the existing water crisis and water resources management. This study was carried out to assess the rainfall variability, meteorological drought and relative response of a water supply reservoir located in Chennai Metropolitan, India. Spatial and temporal variation of rainfall an...

Land use/land cover in coastal regions of large cities is affected due to rapid urbanization and industrialization. Chennai, a coastal city of Tamil Nadu, India, has witnessed tremendous changes in land use/land cover over the past two decades. Post-classification correlation change detection method was used to identify the changes over the decade....

Disposal of industrial waste is of great concern because it releases toxic metals resulting into the degradation of environments and consequently causes health effects on humans. The present study was carried out with the objectives of identifying the possible source and migration of contaminants in the surface water and groundwater and the associa...

Spatial and Temporal Variations in Geochemistry of Cauvery River Sediments (Tamilnadu, India): Indicators of Provenance and Weathering

South-West (SW), North-East (NE) and Post-monsoon Cauvery River sediment geochemistry characterizes the intensity of chemical weathering ascribing to the relative mobility of elements during weathering. The negative correlation between Al2O3% and SiO2% signifies that the sediments are enriched with quartz and, Al2O3% vs. TiO2% relationship deduces...

A well-designed environmental monitoring plan is essential for safety of uranium mining and processing operations. Evaluating the possible uncertainties in a numerical model helps in enhancing the model output and also increases the reliability over the model results. For a radionuclide transport model, distribution coefficient is a sensitive param...

The groundwater over pumping induced land subsidence is one of the major geological hazards in the alluvial aquifers. The objective of this study is to assess the rate of land subsidence in Kolkata metropolitan area, India. Land subsidence can be estimated with high precision by Small Baseline Subset (SBAS) analysis. The advantages of this method a...

The deterioration of groundwater quality has become a serious problem for the safe drinking water supply in many parts of the world. Along coastal aquifers, the saline water moves landward due to several reasons even though significant rainfall is available. The objective of the present study is to investigate the impact of a combined recharge stru...

This study integrates the time series of satellite data, i.e. (terrestrial water storage (TWS) extracted from Gravity Recovery and Climate Experiment (GRACE), soil moisture (SM) from Global Land Data Assimilation System (GLDAS), rainfall from Tropical Rainfall Measuring Mission (TRMM)) with in-situ data, i.e. (groundwater (GW) observatory well data...

The origin of groundwater and the processes controlling its chemical composition in complex coastal aquifers is of interest, as about 44% of the world’s population live in coastal areas. Groundwater over-exploitation in the highly urbanized coastal regions has exerted pressure on these aquifers leading to seawater intrusion. This study aimed to ide...

Groundwater quality and its suitability for drinking and irrigation uses were assessed and multivariate statistical analysis were applied to understand the chemical characteristics of groundwater in the upper part of Luvuvhu sub-catchment in Limpopo, South Africa. The groundwater samples collected during August 2015 (n = 41) and November 2016 (n =...

Identification of groundwater recharge zones in an area is important to properly utilize and safeguard the groundwater resources. The objective of this study is to delineate the groundwater potential zones in the Chinnar River basin of Perambalur district, southern India, using remote sensing and GIS methods. Toposheets and satellite imageries were...

The collapse of a submerged granular pile under the action of the gravity force is investigated by means of a depth averaged model (hereinafter DAM). The granular pile is a mixture of solid particles and ambient liquid, totally covered by a layer of ambient liquid. The DAM is obtained by depth-averaging the mass and momentum equations of the mixtur...

Increasing water demand and climate change poses a great challenge in managing water resources availability. Reservoir operation during heavy rainfall events in an urbanized region is crucial in terms of decision making. The objective of this study is to assess the significance of reservoir operation during extreme rainfall events on flood mitigati...

Seawater intrusion and submarine groundwater discharge are the contrary processes which plays important role in management of groundwater in coastal regions. A study was carried out to identify the seawater intrusion and submarine groundwater discharge zones along the coast of South Chennai. Groundwater samples and porewater samples were collected...

Remote sensing, geophysical, geological and hydrogeological methods were used to characterise the aquifer of a proposed uranium mining and tailings pond area in India. Examination of lithologs show uranium occurrence at the Eparchaean unconformity at a depth of about 50 to 60 m below the surface. Resistivity studies showed four distinct zones- top...

The hydrogeology of India represents one of the diverse systems in the world. The hydrologically distinct Himalayan highlands and its foreland basins with deposits of indo-Ganga Brahmaputra system gradually merges with the cratonic provinces of central and south India, fluvioaeolian deposits of west and the basaltic province of the Deccan plateau....

Extreme rainfall events in an urban area pose various challenges to the water resource managers in terms of flood mitigation, inundation, water conservation and harvesting for drinking water supply. The objective of this study is to apply the box-model approach to evaluate reservoir operation during extreme rainfall events. A large water supply res...

Intrusion of seawater into the coastal aquifers is a major concern as it affects the quality of groundwater. The objective of this study is to delineate the extent of seawater intrusion in the Indian coast based on previous studies and estimate the area as well as locations of seawater intrusion and submarine groundwater discharge based on the grou...

Uranium is a long lived radioactive element which is naturally present in minute concentrations in igneous, sedimentary and metamorphic rocks. These rocks when subjected to weathering results in the formation of soil which also has traces of uranium. Distribution coefficient (Kd) is a crucial parameter in environmental assessment which is used to p...

The origin and salinization of groundwater in multi layered coastal aquifer of Sankaraparani river basin, India was studied using isotopes and geochemical signatures. Groundwater in this region occurs in shallow unconfined and deep confined aquifers. The shallow aquifer comprises of Quaternary Alluvium whereas the deeper aquifer comprises of Tertia...

The present study focuses on the exploration of groundwater potential zones in Vellore district, Tamil Nadu, India based on geospatial technologies. Various thematic layers such as landuse/ land cover, soil texture, slope, geology, geomorphology, drainage and lineament density, rainfall, transmissivity, permeability and specific capacity were deriv...

The publisher regrets that the original version of this article contained errors. Figures 7 to 10 were shown in the wrong version, thus corrected figures are shown in this article. The original article has been corrected.

The chapter discusses the power of GIS as a tool to develop solutions for groundwater resource problems and presents applications of GIS and geostatistical techniques in various field such as science, engineering, planning, and resource management. The modern applications of GIS and statistical approaches can be used to study issues in groundwater...

Groundwater storage augmented by Managed Aquifer Recharge methods in a region will help to manage water supply when there is insufficient availability surface water. The present study was carried out to use the stable isotopes of oxygen and hydrogen to study the interaction between the surface and groundwater at Managed Aquifer Recharge (Check dam)...