Shakir Ali is a hydrogeologist working in Jal Jeevan Mission sponsored by the Ministry of Jal Shakti, Govt. of India. He works on groundwater global contaminants, particularly fluoride, environmental isotopes, and groundwater modelling. He has 20+ research articles in international peer-reviewed journals, and 10+ years of research and teaching experience in the field of hydrogeology. He worked as an Assistant Professor at the Himachal Pradesh University, India.Abdelazim Negm is a Professor of Hydraulics (and Water Resources management) at the Faculty of Engineering, Zagazig University (ZU), Egypt, since 2004. He was the Vice Dean of the Faculty of Engineering of ZU from 12/2008 to 12/2011 and was the Head of the Environmental Engineering Department at Egypt-Japan University of Science and Technology (E-JUST), Egypt, from October 2013 to March 2016. With 400+ papers in national and international journals and conferences, Prof. Negm has also contributed to 50+ book chapters and edited 35+ books, including some volumes in The Handbook of Environmental Chemistry book series from Springer. He was the editor-in-chief of EIJEST during the period of 2017–2020, an editor of the EMJEI, which is published by Springer, and an associate editor of the Journal of Remote Sensing and Space Sciences and Scientific African Journal, which is published by Elsevier. He is a guest editor MDPI and Frontiers leading several special issues. He was also the Head of the permanent scientific committee on Water Resources (committee no.115), the supreme council of Egyptian Universities, Egypt. Prof. Negm is listed in the most famous and prestigious directories in the world including the American Biographical Institute (ABI), Inc, USA, “Marquis Who's Who in the World,” 27th Ed., 2010, USA, until now and in IBC's 2000 as an Outstanding Intellectuals of the 21st Century by International Biographical Center, Cambridge, England, since 2011 until the present. He was nominated for various awards by both ABI and IBC during the period 2011–2012.

• Part 1: Assessment of groundwater quality.- Chapter 1: Unveiling the Hidden Depths: A Review for Understanding and Managing Groundwater Contamination in Arid Regions.- Chapter 2: Risk Assessment of Potential Groundwater Contamination by the Agricultural Drainage Water in the Central Valley Watershed, California, USA.- Chapter 3: Impact of Bugun Reservoir on Groundwater and Soil: A Case Study from South Kazakhstan.- Chapter 4: Impact of Climate Changes on Seawater Intrusion in the Nile Delta Aquifer (Egypt).- Chapter 5: Groundwater Quality Prediction in Upper and Middle Cheliff Plain, Algeria Using Artificial Intelligence.- Chapter 6: Evolution of Groundwater in the Cheliff and Mitidja Aquifers (North Algeria) in Qualitative and Quantitative Terms.- Chapter 7: Groundwater Pollution Sources and Its Quality in Kingdom of Saudi Arabia- State-of-the-Art.- Chapter 8: Isotopic and Chemical Composition of Egypt’s Groundwater Resources.- Chapter 9: Understanding Seawater Intrusion byHydrochemical Parameters and Stable Water Isotopes along the Coastal Alluvial Aquifers of the Essaouira Basin, Morocco.- Part 2: Major global contaminants in groundwater.- Chapter 10: Geochemical Controls on Fluoride Enrichment in Groundwater of a Geologically Heterogeneous Part of Ghana: Implications for Human Health Risk Assessment.- Chapter 11: Uncovering Fluoride Contamination in Groundwater of Arid and Semi-Arid Regions: Stigma to Solutions.- Chapter 12: Nitrate Contamination in Groundwater of Arid and Semi-Arid Regions: Ecotoxicological Impacts and Management Strategies.

Shakir Ali is a hydrogeologist working in Jal Jeevan Mission sponsored by the Ministry of Jal Shakti, Govt. of India. He works on groundwater global contaminants, particularly fluoride, environmental isotopes, and groundwater modelling. He has 20+ research articles in international peer-reviewed journals, and 10+ years of research and teaching experience in the field of hydrogeology. He worked as an Assistant Professor at the Himachal Pradesh University, India.Abdelazim Negm is a Professor of Hydraulics (and Water Resources management) at the Faculty of Engineering, Zagazig University (ZU), Egypt, since 2004. He was the Vice Dean of the Faculty of Engineering of ZU from 12/2008 to 12/2011 and was the Head of the Environmental Engineering Department at Egypt-Japan University of Science and Technology (E-JUST), Egypt, from October 2013 to March 2016. With 400+ papers in national and international journals and conferences, Prof. Negm has also contributed to 50+ book chapters and edited 35+ books, including some volumes in The Handbook of Environmental Chemistry book series from Springer. He was the editor-in-chief of EIJEST during the period of 2017–2020, an editor of the EMJEI, which is published by Springer, and an associate editor of the Journal of Remote Sensing and Space Sciences and Scientific African Journal, which is published by Elsevier. He is a guest editor MDPI and Frontiers leading several special issues. He was also the Head of the permanent scientific committee on Water Resources (committee no.115), the supreme council of Egyptian Universities, Egypt. Prof. Negm is listed in the most famous and prestigious directories in the world including the American Biographical Institute (ABI), Inc, USA, “Marquis Who's Who in the World,” 27th Ed., 2010, USA, until now and in IBC's 2000 as an Outstanding Intellectuals of the 21st Century by International Biographical Center, Cambridge, England, since 2011 until the present. He was nominated for various awards by both ABI and IBC during the period 2011–2012.

• Part 1: Assessment of groundwater quality.- Chapter 1: Unveiling the Hidden Depths: A Review for Understanding and Managing Groundwater Contamination in Arid Regions.- Chapter 2: Risk Assessment of Potential Groundwater Contamination by the Agricultural Drainage Water in the Central Valley Watershed, California, USA.- Chapter 3: Impact of Bugun Reservoir on Groundwater and Soil: A Case Study from South Kazakhstan.- Chapter 4: Impact of Climate Changes on Seawater Intrusion in the Nile Delta Aquifer (Egypt).- Chapter 5: Groundwater Quality Prediction in Upper and Middle Cheliff Plain, Algeria Using Artificial Intelligence.- Chapter 6: Evolution of Groundwater in the Cheliff and Mitidja Aquifers (North Algeria) in Qualitative and Quantitative Terms.- Chapter 7: Groundwater Pollution Sources and Its Quality in Kingdom of Saudi Arabia- State-of-the-Art.- Chapter 8: Isotopic and Chemical Composition of Egypt’s Groundwater Resources.- Chapter 9: Understanding Seawater Intrusion byHydrochemical Parameters and Stable Water Isotopes along the Coastal Alluvial Aquifers of the Essaouira Basin, Morocco.- Part 2: Major global contaminants in groundwater.- Chapter 10: Geochemical Controls on Fluoride Enrichment in Groundwater of a Geologically Heterogeneous Part of Ghana: Implications for Human Health Risk Assessment.- Chapter 11: Uncovering Fluoride Contamination in Groundwater of Arid and Semi-Arid Regions: Stigma to Solutions.- Chapter 12: Nitrate Contamination in Groundwater of Arid and Semi-Arid Regions: Ecotoxicological Impacts and Management Strategies.

Shakir Ali is a hydrogeologist working in Jal Jeevan Mission sponsored by the Ministry of Jal Shakti, Govt. of India. He works on groundwater global contaminants, particularly fluoride, environmental isotopes, and groundwater modelling. He has 20+ research articles in international peer-reviewed journals, and 10+ years of research and teaching experience in the field of hydrogeology. He worked as an Assistant Professor at the Himachal Pradesh University, India.Abdelazim Negm is a Professor of Hydraulics (and Water Resources management) at the Faculty of Engineering, Zagazig University (ZU), Egypt, since 2004. He was the Vice Dean of the Faculty of Engineering of ZU from 12/2008 to 12/2011 and was the Head of the Environmental Engineering Department at Egypt-Japan University of Science and Technology (E-JUST), Egypt, from October 2013 to March 2016. With 400+ papers in national and international journals and conferences, Prof. Negm has also contributed to 50+ book chapters and edited 35+ books, including some volumes in The Handbook of Environmental Chemistry book series from Springer. He was the editor-in-chief of EIJEST during the period of 2017–2020, an editor of the EMJEI, which is published by Springer, and an associate editor of the Journal of Remote Sensing and Space Sciences and Scientific African Journal, which is published by Elsevier. He is a guest editor MDPI and Frontiers leading several special issues. He was also the Head of the permanent scientific committee on Water Resources (committee no.115), the supreme council of Egyptian Universities, Egypt. Prof. Negm is listed in the most famous and prestigious directories in the world including the American Biographical Institute (ABI), Inc, USA, “Marquis Who's Who in the World,” 27th Ed., 2010, USA, until now and in IBC's 2000 as an Outstanding Intellectuals of the 21st Century by International Biographical Center, Cambridge, England, since 2011 until the present. He was nominated for various awards by both ABI and IBC during the period 2011–2012.

• Part 1: Assessment of groundwater quality.- Chapter 1: Unveiling the Hidden Depths: A Review for Understanding and Managing Groundwater Contamination in Arid Regions.- Chapter 2: Risk Assessment of Potential Groundwater Contamination by the Agricultural Drainage Water in the Central Valley Watershed, California, USA.- Chapter 3: Impact of Bugun Reservoir on Groundwater and Soil: A Case Study from South Kazakhstan.- Chapter 4: Impact of Climate Changes on Seawater Intrusion in the Nile Delta Aquifer (Egypt).- Chapter 5: Groundwater Quality Prediction in Upper and Middle Cheliff Plain, Algeria Using Artificial Intelligence.- Chapter 6: Evolution of Groundwater in the Cheliff and Mitidja Aquifers (North Algeria) in Qualitative and Quantitative Terms.- Chapter 7: Groundwater Pollution Sources and Its Quality in Kingdom of Saudi Arabia- State-of-the-Art.- Chapter 8: Isotopic and Chemical Composition of Egypt’s Groundwater Resources.- Chapter 9: Understanding Seawater Intrusion byHydrochemical Parameters and Stable Water Isotopes along the Coastal Alluvial Aquifers of the Essaouira Basin, Morocco.- Part 2: Major global contaminants in groundwater.- Chapter 10: Geochemical Controls on Fluoride Enrichment in Groundwater of a Geologically Heterogeneous Part of Ghana: Implications for Human Health Risk Assessment.- Chapter 11: Uncovering Fluoride Contamination in Groundwater of Arid and Semi-Arid Regions: Stigma to Solutions.- Chapter 12: Nitrate Contamination in Groundwater of Arid and Semi-Arid Regions: Ecotoxicological Impacts and Management Strategies.