Maréchal, JC., Selles, A., Dewandel, B., Boisson, A., Perrin, J., Ahmed, S. (2018). An observatory of groundwater in crystalline rock aquifers exposed to a changing environment - Hyderabad (India), Vadose Zone Journal, in Press.

Nicolas, M., Bour, O., Selles, A., Dewandel, B., Bailly-Comte, V., Chandra, S., Ahmed, S., Maréchal, J.-C. (submitted). Managed Aquifer Recharge in fractured crystalline rock aquifers: impact of horizontal preferential flow on recharge dynamics

Sonkamble, S., Wajihuddin, M., Jampani, M., Sarah, S., Somvanshi, V.K., Ahmed, S., Amerasinghe, P. and Boisson, A. (2018). Natural treatment system models for wastewater management: a study from Hyderabad, India. Water Science and Technology, 77(2), pp.479-492.



Arora, K., Chadha, R.K., Srinu, Y., Selles, A., Davuluri, S., Smirnov, V., Ponomarev, A. and Mikhailov, V.O., 2017. Lineament fabric from airborne LiDAR and its influence on triggered earthquakes in the Koyna-Warna region, western India. Journal of the Geological Society of India, 90(6), pp.670-677.

Chatterjee, A., Sarah, S., Sreedevi, P.D., Selles, A. and Ahmed, S., 2017. Demarcation of fluoride vulnerability zones in granitic aquifer, semi-arid region, Telengana, India. Arabian Journal of Geosciences, 10(24), p.558.

Dewandel, Benoît, Yvan Caballero, Jérôme Perrin, Alexandre Boisson, Fabrice Dazin, Sylvain Ferrant, Subash Chandra, and Jean‐Christophe Maréchal. (2017) "A methodology for regionalizing 3‐D effective porosity at watershed scale in crystalline aquifers." Hydrological Processes 31, no. 12: 2277-2295.

Ferrant, S., Selles, A., Le Page, M., Herrault, P.-A., Pelletier, C., Al-Bitar, A., Mermoz, S., Gascoin, S., Bouvet, A., Saqalli, M. Dewandel, B., Caballera, Y., Ahmed, S., Maréchal, J.-C., Kerr, Y. (2017). Detection of Irrigated Crops from Sentinel-1 and Sentinel-2 Data to Estimate Seasonal Groundwater Use in South India. Remote Sensing, 9(11).

Guihéneuf, N., Bour, O., Boisson, A., Le Borgne, T., Becker, M. W., Nigon, B., Wadjiduddin, M., Ahmed, S., Maréchal, J.-C. (2017). Insights about transport mechanisms and fracture flow channeling from multi-scale observations of tracer dispersion in shallow fractured crystalline rock. Journal of Contaminant Hydrology, 206, 18–33. https://doi.org/10.1016/j.jconhyd.2017.09.003





Ahmed, S., Aroral, T., Sarah, S., Dar, F.A., Gaur, T.K., Warsi, T. and Raghuvender, P. (2016) Viewing Sub-Surface for an Effective Managed Aquifer Recharge from a Geophysical Perspective, Chapter 18 In Thomas Wintgens, Anders Nättorp, Elango Lakshmanan and Shyam R. Asolekar (Eds.)  Natural Water Treatment Systems for Safe and Sustainable Water Supply in the Indian Context: Saph Pani, IWA Publishing, UK., Pages: 301-315,ISBN: 978178 0407104.

Alazard, M., Boisson, A., Pettenati M., Picot-Colbeaux, G., Perrin, J., Dewandel, B., Maréchal J.C., Ahmed, S., Kloppmann, W. (2016) Investigation of recharge dynamics and flow paths in a fractured crystalline aquifer in semi-arid India using borehole logs: implications for managed aquifer recharge. Hydrogeology journal, 24, 35-37. DOI: 10.1007/s10040-015-1323-5

Amerasinghe, P., Mahesh, J. Sonkamble, S., Wajihuddin, M., Boisson, A., Fahimuddin, M. and Ahmed, S.(2016) Characterization and performance assessment of natural treatment systems ina wastewater irrigated micro-watershed: Musi River case study, Chapter 11 In Thomas Wintgens, Anders Nättorp, Elango Lakshmanan and Shyam R. Asolekar (Eds.)  Natural Water Treatment Systems for Safe and Sustainable Water Supply in the Indian Context: Saph Pani, IWA Publishing, UK. Pages: 177-189, ISBN: 978178 0407104.

Amarasinghe, M., Sonkamble,S., Jampani, M.,  Wajihuddin, M., P. Elango, E., Starkl,M., Sarah, S., Fahimuddin, M. and Ahmed,S. (2016) Developing Integrated Management Plans for Natural Treatment Systems in Urbanized Areas - Case studies from Hyderabad and Chennai, Chapter 15 In Thomas Wintgens, Anders Nättorp, Elango Lakshmanan and Shyam R. Asolekar (Eds.)  Natural Water Treatment Systems for Safe and Sustainable Water Supply in the Indian Context: Saph Pani, IWA Publishing, UK., Pages: 251-264, ISBN: 978178 0407104..

Arora, K., Purnachandra Rao, N., Selles, A., Satyavani, N., & Satyanarayana, H. V. S. (2016). Tectonic regime of Koyna–Warna intraplate reservoir triggered seismic zone from surface and subsurface features. Geoinf. Res. Papers Ser, 4, 1.

Boisson, A., Alazard,M., Picot-Colbeaux, G., Pettenati, M., Perrin,J., Sarah S., Dewandel, B. Ahmed, S., Maréchal, J.C. and Kloppmann, W. (2016) Percolation tanks as managed aquifer recharge structures in crystalline aquifers - an example from the Maheshwaram watershed, Chapter 7 In Thomas Wintgens, Anders Nättorp, Elango Lakshmanan and Shyam R. Asolekar (Eds.)  Natural Water Treatment Systems for Safe and Sustainable Water Supply in the Indian Context: Saph Pani, IWA Publishing, UK.Pages:113-125, ISBN: 978178 0407104.

Kloppmann, W., Sandhu, C., Groeschke, M., Pandian, R.S. Picot-Colbeau, G., Fahimuddin, M., Ahmed, S., Alazard, M., Amerasinghe, P., Bhola, Punit., Boisson, A., Elango, L., Feistel, U., Fischer, S., Ghosh, N.C., Grischek, T., Grutzmacher, G., Hamann, E.,Nair, I.S., Jampani, M., Mondal, N.C., Monninkhoff, B., Pettenati, M., Rao, S., Sarah, S., Schneider, M., Sklorz, S., Thiery, D. and Zabel, A. (2016) Modeling of natural water treatment systems in India: learning from the Saph Pani case studies, Chapter 14 In Thomas Wintgens, Anders Nättorp, Elango Lakshmanan and Shyam R. Asolekar (Eds.)  Natural Water Treatment Systems for Safe and Sustainable Water Supply in the Indian Context: Saph Pani, IWA Publishing, UK., Pages: 227-249, ISBN: 978178 0407104




Boisson, A., Alazard, M., Picot-Colbeaux, G., Pettenati, M., Perrin, J., Chandra, S., Dewandel, B., Ahmed, S., Maréchal, J.C and Kloppmann, W. Percolation tanks as Managed Aquifer Recharge structures in crystalline aquifers – An example from the Maheshwaram watershed. SaphPani Handbook – Chapter 7

Boisson, A., Guihéneuf, N., Perrin, J., Bour, O., Dewandel, B., Dausse, A., Viossanges, M., Ahmed, S., Maréchal, J.C., 2015. Determining the vertical evolution of hydrodynamic parameters in weathered and fractured south Indian crystalline-rock aquifers: insights from a study on an instrumented site. Hydrogeol J 23, 757–773. doi:10.1007/s10040-014-1226-x

Boisson, A., Marechal, J.C., Perrin, J., Dewandel, B. and Ahmed, S. (2015) Impact of vertical geological structure and water table depletion on Indian crystalline aquifers, Engineering Geology for Society and Territory, Vol 3:583-587. DOI: 10.1007/978-3-319-09054-2_117

Boisson, A., Villesseche, D., Baisset, M., Perrin, J., Viossanges, M., Kloppmann, W., Chandra, S., Dewandel, B., Picot-Colbeaux, G., Rangarajan, R., Maréchal, J.C., Ahmed, S., (2015). Questioning the impact and sustainability of percolation tanks as aquifer recharge structures in semi-arid crystalline context. Environmental Earth Sciences DOI 10.1007/s12665-014-3229-2

Chandra, S., Boisson, A., Ahmed, S. (2015) Quantitative characterization to construct hard rock lithological model using dual resistivity borehole logging. Arab J Geosci. DOI 10.1007/s12517-014-1448-1

Guiheneuf, N., O. Bour, A. Boisson, T. Leborgne, M. W. Becker, B. Nigon, M. Wajiduddin, S. Ahmed and J.C. Marechal (2015), Identification of transport processes in fractured crystalline rock from different forced-gradient tracer experiments conducted in Southern India, Contaminant Hydrology.

Pauwels H., Négrel P., Dewandel B., Perrin J., Mascré C., Roy S. and Ahmed S. (2015) Hydrochemical Borehole Loggings For Characterizing Fluoride Contamination In A Heterogenous Aquifer (Maheshwaram, India), Jour. of Hydrol. 525, 302-312


Boisson, A., Baisset, M., Alazard, M., Perrin, J., Villesseche, D, Kloppmann, W., Chandra, S., Dewandel, B., Picot-Colbeaux, G., Ahmed, S., Maréchal, JC. (2014) Comparison of surface and groundwater balance approaches in the evaluation of managed aquifer recharge structure: Case of a percolation tank in hard rocks aquifer in India. Journal of Hydrology 519:1620-1633

Chandra, S., Boisson, A., Ahmed, S. Quantitative characterization to construct hard rock lithological model using dual resistivity borehole logging. Arab J Geosci. DOI 10.1007/s12517-014-1448-1

Dar, Farooq A., Jerome Perrin, S. Ahmed, A.C. Narayana and J. Riotte (2014) Hydrogeochemical characteristics of Karst Aquifer from a semi-arid region of Southern India and impact of rainfall recharge on groundwater chemistry, Arab. Jour. of Geosciences, DOI 10.1007/s12517-014-1440-9

Dar, Farooq A., Perrin, J., Ahmed, S. and Narayana, A.C. (2014) Review: Carbonate aquifers and future perspectives of karst hydrogeology in India, Hydrogeology Journal, DOI 10.1007/s10040-014-1151-z.

Dewandel, B., Aunay, B., Maréchal, J. C., Roques, C., Bour, O., Mougin, B., & Aquilina, L. (2014). Analytical solutions for analysing pumping tests in a sub-vertical and anisotropic fault zone draining shallow aquifers. Journal of Hydrology, 509, 115-131. doi:https://doi.org/10.1016/j.jhydrol.2013.11.014

Ferrant, S., Y Caballero, J Perrin, S Gascoin, B Dewandel, S Aulong, F. Dazin, S.Ahmed, JC Marechal (2014) Projected impacts of climate change on farmers' extraction of groundwater from crystalline aquifers in South India, Scientific reports, 4: 3697, www.nature.com 10.1038/srep03697

Guihéneuf, N., Boisson, A., Bour, O., Dewandel, B., Perrin, J., Dausse, A., Viossanges, M., Chandra, S., S. Ahmed, S., Maréchal, J.C. (2014). Groundwater flows in weathered crystalline rocks: impact of piezometric variations and depth-dependent fracture connectivity. J. Hydrol.511: 320-334.

Massuel, S., J Perrin, C Mascre, W Mohamed, A Boisson, S Ahmed (2014) Managed aquifer recharge in South India: What to expect from small percolation tanks in hard rock?, Journal of Hydrology, 512:157-167.

Pettenati M., Picot-Colbeaux, G., Thiéry, D., Boisson, A., Alazard, M., Perrin, J., Dewandel, B., Maréchal, J.C., Ahmed, S., Kloppmann, W. 2014 Water quality evolution during managed aquifer recharge (MAR) in India crystalline basement aquifers: reactive transport modeling in critical zone. (2014) GES - Procedia: Earth and Planetary Science. (10) 82-87 DOI: 10.1016/j.proeps.2014.08.016

Sarah S., Ahmed S., Boisson, A., Violette S and de Marsliy .G . (2014) Projected groundwater balance as a state indicator for addressing sustainability and management challenges of overexploited crystalline aquifers. Journal of Hydrology 519:1405-1419




Khan H H, Khan A, Ahmed S, Gennero MC, Minh KD and Cazenave A, (2013)  Terrestrial water dynamics in the lower Ganges - estimates from ENVISAT and GRACE, Arabian Journal of Geosciences, published online,DOI 10.1007/s12517-012-0629-z.

Pauwels, H., L Aquilina, P Negrel, O Bour, J Perrin, S Ahmed (2013) Groundwater Salinization in Hard-Rock Aquifers: Impact of Pumping and Vertical Transfers, Procedia Earth and Planetary Science, 7, 660-664.

Pettenati, M., Perrin, J., Pauwels, H., and Ahmed, S. (2013), Simulating fluoride evolution in groundwater using a reactive multicomponent transient transport model: Application to a crystalline aquifer of Southern India, Applied Geochemistry, 29, 102-116.


Dewandel, B., Maréchal, J. C., Bour, O., Ladouche, B., Ahmed, S., Chandra, S., and Pauwels, H. (2012), Upscaling and regionalizing hydraulic conductivity and effective porosity at watershed scale in deeply weathered crystalline aquifers, Journal of Hydrology, 416-417, 83-97.

Perrin, J., Ferrant, S., Massuel, S., Dewandel, B., Maréchal, J. C., Aulong, S., and Ahmed, S. (2012), Assessing water availability in a semi-arid watershed of southern India using a semi-distributed model, Journal of Hydrology, 460-461, 143-155.


Chandra, S., Ahmed, S., and Rangarajan, R. (2011), Lithologically constrained rainfall (LCR) method for estimating spatio-temporal recharge distribution in crystalline rocks, Journal of Hydrology, 402(3–4), 250-260.

Dar, Farooq A., Jerome P., Riotte,J., Gebauer, H.D., Narayana, A.C. and Ahmed, S. (2011) Karstification in the Cuddapah Sedimentary Basin, Southern India: Implications for Groundwater Resources, Acta Carsologica, 40/3:457-472.

Dewandel, B., Lachassagne, P., Zaidi, F. K., and Chandra, S. (2011), A conceptual hydrodynamic model of a geological discontinuity in hard rock aquifers: Example of a quartz reef in granitic terrain in South India, Journal of Hydrology, 405(3-4), 474-487.

Khan, H. H., Khan, A., Ahmed, S., and Perrin, J. (2011), GIS-based impact assessment of land-use changes on groundwater quality: study from a rapidly urbanizing region of South India, Environmental Earth Sciences, 63(6), 1289-1302.

Negrel, P., Pauwels, H., Dewandel, B., Gandolfi, J. M., Mascré, C., and Ahmed, S. (2011), Understanding groundwater systems and their functioning through the study of stable water isotopes in a hard-rock aquifer (Maheshwaram watershed, India), Journal of Hydrology, 397(1-2), 55-70.

Pauwels, H., Pettenati, M., Perrin, J., and Negrel, P. (2011), Vulnerability of intensively-exploited hard-rock aquifers to fluoride contamination in India: impact of global change, in Fourth International Groundwater Conference (IGWC-2011), edited, Madurai, India.

Perrin, J., Mascré, C., Pauwels, H., and Ahmed, S. (2011), Solute recycling: An emerging threat to groundwater quality in southern India?, Journal of Hydrology, 398(1-2), 144-154.


Chandra, S., Dewandel, B., Dutta, S., and Ahmed, S. (2010), Geophysical model of geological discontinuities in a granitic aquifer: Analyzing small scale variability of electrical resistivity for groundwater occurrences, Journal of Applied Geophysics, 71(4), 137-148.

Dewandel, B., Perrin, J., Ahmed, S., Aulong, S., Hrkal, Z., Lachassagne, P., Samad, M., and Massuel, S. (2010), Development of a tool for managing groundwater resources in semi-arid hard rock regions: application to a rural watershed in South India, Hydrological Processes, 24(19), 2784-2797.

Maréchal, J.-C. (2009), Editor′s message: the sunk cost fallacy of deep drilling, Hydrogeology Journal, 18(2), 287-289.

Négrel, P., Millot, R., Roy, S., Guerrot, C., and Pauwels, H. (2010), Lead isotopes in groundwater as an indicator of water–rock interaction (Masheshwaram catchment, Andhra Pradesh, India), Chemical Geology, 274(3-4), 136-148.

Perrin, J., Massuel, S., and Ahmed, S. (2010), Contribution of percolation tanks to total aquifer recharge: the example of Gajwel watershed, southern India, in Ground Water Conference, edited, Abu Dhabi.


Chandra, S., Ahmed, S., Ram, A., and Dewandel, B. (2008), Estimation of hard rock aquifers hydraulic conductivity from geoelectrical measurements: A theoretical development with field application, Journal of Hydrology, 357(3-4), 218-227.

Dewandel, B., Gandolfi, J. M., de Condappa, D., and Ahmed, S. (2008), An efficient methodology for estimating irrigation return flow coefficients of irrigated crops at watershed and seasonal scale, Hydrological Processes, 22(11), 1700-1712.

Massuel S., Perrin J., Wajid M., Mascre C., Dewandel B. (2008). A simple low-cost method for monitoring groundwater pumping duration. Ground Water. doi: 10.1111/j.1745-6584.2008.00511.x


Dewandel, B., Gandolfi, J. M., Zaidi, F. K., Ahmed, S., and Subrahmanyam, K. (2007), A decision support tool with variable agroclimatic scenarios for sustainable groundwater management in semi-arid hard-rock areas, Current Science, 92(8), 1093-1102.

Dewashish Kumar, S. Ahmed, N.S. Krishnamurthy and Benoit Dewandel (2007) Reducing ambiguities in vertical electrical sounding interpretations: A geostatistical application, Applied Geophysics,  62:16-32.

Maréchal, J.C., B. Dewandel, S. Ahmed and P. Lachassagne(2007) Hard rock aquifers characterization prior to modelling at catchment scale: an application in India, Special Issue of IAH Publication SP-04, Springer.

Pauwels, H. and S. Ahmed (2007), Fluoride in groundwater: Origin and health impacts, Geosciences, No. 5, March 2007, p. 68-73.

Zaidi, F. K., Ahmed, S., Dewandel, B., and Maréchal, J.-C. (2007), Optimizing a piezometric network in the estimation of the groundwater budget: a case study from a crystalline-rock watershed in southern India, Hydrogeology Journal, 15(6), 1131-1145.


Dewandel, B., Lachassagne, P., Wyns, R., Maréchal, J. C., and Krishnamurthy, N. S. (2006), A generalized 3-D geological and hydrogeological conceptual model of granite aquifers controlled by single or multiphase weathering, Journal of Hydrology, 330(1-2), 260-284.

Dutta S., Krishnamurthy, N.S., Arora T., Rao, V.A., S. Ahmed and Baltassat, J.M. (2006) Localization of water bearing fractured zones in a hard rock area using integrated geophysical techniques in Andhra Pradesh, India, Hydrogeology Journal, 14(5):760-766.

Lachassagne, P., S. Ahmed, B. Dewandel, JM Gandolfi, JC Marechal and R. Wyns (2006) Les Aquifères Fissurés, Géochronique, No. 97, March 2006, Pages: 38-41.

Maréchal, J. C., Dewandel, B., Ahmed, S., Galeazzi, L., and Zaidi, F. K. (2006), Combined estimation of specific yield and natural recharge in a semi-arid groundwater basin with irrigated agriculture, Journal of Hydrology, 329(1-2), 281-293.

Maréchal, J.-C., Ahmed, S., Engerrand, C., Galeazzi, L., and Touchard, F. (2006), Threatened Groundwater Resources in Rural India: An Example of Monitoring, Asian Journal of Water, Environment and Pollution, 3(2), 15-21.

Sreedevi, P.D.,S. Ahmed, B. Made, E. Ledoux and JM Gandolfi (2006) Association of Hydrogeological factors in temporal variations of fluoride concentration in a crystalline aquifer in India, Environmental Geology, 50(1):1-11.



Lachassagne P, JC Marechal, S. Ahmed, B. Dewandel, JM Gandolfi, NS Krishnamurthy, K. Subrahmanyam and R. Wyns (2005) New tools and methods for managing and protecting hard rock water resources (Nouveaux outils et methods pour gérer et protéger la resource en eau souterraine des regions de socle), Hydrosciences,25:54-57.


Maréchal, J. C., Dewandel, B., and Subrahmanyam, K. (2004), Use of hydraulic tests at different scales to characterize fracture network properties in the weathered-fractured layer of a hard rock aquifer, Water Resources Research, 40(11).

Marechal, J. C., Wyns, R., Lachassagne, P., and Subrahmanyam, K. (2004), Vertical anisotropy of hydraulic conductivity in the fissured layer of hard-rock aquifers due to the geological patterns of weathering profiles, Journal of the Geological Society of India, 63(5), 545-550.


Marechal, J. C., Dewandel, B., Subrahmanyam, K., and Torri, R. (2003), Specific methods for the evaluation of hydraulic properties in fractured hard-rock aquifers, Current Science, 85(4), 511-516.

Maréchal, J. C., Wyns, R., Lachassagne, P., Subrahmanyam, K., and Touchard, F. (2003), Anisotropie verticale de la perméabilité de l'horizon fissuré des aquifères de socle: correspondance avec la structure géologiques des profils d'altération, C.R. Géoscience, 335(5), 451-460.

MaréchalJ.C., Dewandel B., Subrahmanyam K. And Torri R.,(2003). Specific Methods for the Evaluation of Hydraulic Properties in Fractured Hard-rock Aquifers. Current Science, August 2003, vol.85, pp. 511-516.

Maréchal, J.C., Galeazzi, L., Dewandel, B., and Ahmed, S., (2003). Importance of irrigation return flow on the groundwater budget of a rural basin in India, published in IAHS Red Book, Publication No. 278, 62-67, 2003.



Ahmed, S., Bertrand, F., Saxena, V.K., Subrahmanyam, K., and Touchard, F., (2002). A geostatistical method of determining priority of measurement wells in a fluoride monitoring network in an aquifer, Journal of Applied Geochemistry, Vol. 4, No. 2B, 576-585.

Marechal, J. C., Sarma, M. P., Ahmed, S., and Lachassagne, P. (2002), Establishment of earth tide effect on water-level fluctuations in an unconfined hard rock aquifer using spectral analysis, Current Science, 83(1), 61-64.