{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T14:09:52Z","timestamp":1777644592871,"version":"3.51.4"},"reference-count":117,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2020,10,9]],"date-time":"2020-10-09T00:00:00Z","timestamp":1602201600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Portuguese Foundation for Science and Technology (FCT)","award":["SFRH\/BD\/117927\/2016"],"award-info":[{"award-number":["SFRH\/BD\/117927\/2016"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Water"],"abstract":"<jats:p>Groundwater in fissured rocks is one of the most important reserves of available fresh water, and urbanization applies an extremely complex pressure which puts this natural resource at risk. Two-thirds of Portugal is composed of fissured aquifers. In this context, the Porto urban region is the second biggest metropolitan area in mainland Portugal. In this study, a multidisciplinary approach was developed, using hydrogeological GIS-based mapping and modeling, combining hydrogeochemical, isotopic, and hydrodynamical data. In addition, an urban infiltration potential index (IPI-Urban) was outlined with the combination of several thematic layers. Hydrogeochemical signatures are mainly Cl-Na to Cl-SO4-Na, being dependent on the geographic proximity of this region to the ocean, and on anthropogenic and agricultural contamination processes, namely fertilizers, sewage, as well as animal and human wastes. Isotopic signatures characterize a meteoric origin for groundwater, with shallow flow paths and short residence times. Pumping tests revealed a semi- to confined system, with low long-term well capacities (&lt;1 L\/s), low transmissivities (&lt;4 m2\/day), and low storage coefficients (&lt;10\u22122). The IPI-Urban index showed a low groundwater infiltration potential, which was enhanced by urban hydraulic and sanitation features. This study assessed the major hydrogeological processes and their dynamics, therefore, contributing to a better knowledge of sustainable urban groundwater systems in fractured media.<\/jats:p>","DOI":"10.3390\/w12102797","type":"journal-article","created":{"date-parts":[[2020,10,17]],"date-time":"2020-10-17T07:23:22Z","timestamp":1602919402000},"page":"2797","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Urban Groundwater Processes and Anthropogenic Interactions (Porto Region, NW Portugal)"],"prefix":"10.3390","volume":"12","author":[{"given":"Maria Jos\u00e9","family":"Afonso","sequence":"first","affiliation":[{"name":"Laboratory of Cartography and Applied Geology (LABCARGA), Department of Geotechnical Engineering, School of Engineering (ISEP), Polytechnic of Porto, 4200-072 Porto, Portugal"},{"name":"GeoBioTec Centre (Georesources, Geotechnics, Geomaterials research group, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"given":"Liliana","family":"Freitas","sequence":"additional","affiliation":[{"name":"Laboratory of Cartography and Applied Geology (LABCARGA), Department of Geotechnical Engineering, School of Engineering (ISEP), Polytechnic of Porto, 4200-072 Porto, Portugal"},{"name":"CITEUC, Department of Earth Sciences, Faculty of Sciences, University of Coimbra, 3030-790 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1644-7195","authenticated-orcid":false,"given":"Jos\u00e9 Manuel","family":"Marques","sequence":"additional","affiliation":[{"name":"Centro de Recursos Naturais e Ambiente (CERENA), Instituto Superior T\u00e9cnico, University of Lisbon, 1049-001 Lisbon, Portugal"}]},{"given":"Paula M.","family":"Carreira","sequence":"additional","affiliation":[{"name":"Centro de Ci\u00eancias e Tecnologias Nucleares (C2TN), Instituto Superior T\u00e9cnico, University of Lisbon, 2695-066 Bobadela, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7392-2255","authenticated-orcid":false,"given":"Alcides J.S.C.","family":"Pereira","sequence":"additional","affiliation":[{"name":"CITEUC, Department of Earth Sciences, Faculty of Sciences, University of Coimbra, 3030-790 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3636-3933","authenticated-orcid":false,"given":"Fernando","family":"Rocha","sequence":"additional","affiliation":[{"name":"GeoBioTec Centre (Georesources, Geotechnics, Geomaterials research group, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9740-935X","authenticated-orcid":false,"given":"Helder","family":"I. Chamin\u00e9","sequence":"additional","affiliation":[{"name":"Laboratory of Cartography and Applied Geology (LABCARGA), Department of Geotechnical Engineering, School of Engineering (ISEP), Polytechnic of Porto, 4200-072 Porto, Portugal"},{"name":"GeoBioTec Centre (Georesources, Geotechnics, Geomaterials research group, University of Aveiro, 3810-193 Aveiro, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2020,10,9]]},"reference":[{"key":"ref_1","unstructured":"Foster, S.D., and Tyson, G. (2015). Resilient Cities & Groundwater, International Association of Hydrogeologists."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Howard, K.W.F., and Israfilov, R.G. (2002). Current Problems of Hydrogeology in Urban Areas, Urban. Agglomerates, and Industrial Centres, Kluwer.","DOI":"10.1007\/978-94-010-0409-1"},{"key":"ref_3","unstructured":"Howard, K.W.F. (2004, January 20\u201328). Urban. Groundwater. Proceedings of the Meeting the Challenge: Selected Papers from the 32nd International Geological Congress (IGC), Florence, Italy."},{"key":"ref_4","unstructured":"Massing, H., Packman, J., and Zuidema, F.C. (1990). Hydrological Processes and Water Management in Urban Areas, IAHS. IAHS Publication No. 198."},{"key":"ref_5","unstructured":"Johnson, S.P. (1993). The Earth Summit: The United Nations Conference on Environment and Development (UNCED), Graham & Trotman\/Martinus Nijhoff."},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Wilkinson, W.B. (1994). Groundwater Problems in Urban Areas, T. Telford.","DOI":"10.1680\/gpiua.19744"},{"key":"ref_7","unstructured":"Chilton, J. (1997, January 21\u201327). Groundwater in the Urban Environment: Problems, Processes and Management. Proceedings of the 27th Congress, International Association of Hydrogeologists, Nottingham, UK."},{"key":"ref_8","unstructured":"Chilton, J. (1999). Groundwater in the Urban Environment: Selected City Profiles, A. A. Balkema."},{"key":"ref_9","unstructured":"Howard, K.W.F. (2004). Groundwater for Socio-Economic Development\u2014The Role of Science, UNESCO. UNESCO IHP-VI Series on Groundwater, 9, Published as CD."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Tellam, J.H., Rivett, M.O., and Israfilov, R.G. (2006). Urban. Groundwater Management and Sustainability, Springer.","DOI":"10.1007\/1-4020-5175-1"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"379","DOI":"10.1007\/s12665-009-0351-7","article-title":"Environmental issues in urban groundwater systems: A multidisciplinary study of the Paranhos and Salgueiros spring waters, Porto (NW Portugal)","volume":"61","author":"Afonso","year":"2010","journal-title":"Environ. Earth Sci."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Afonso, M.J., Freitas, L., Pereira, A.J.S.C., Neves, L.J.P.F., Guimar\u00e3es, L., Guilhermino, L., Mayer, B., Rocha, F., Marques, J.M., and Chamin\u00e9, H.I. (2016). Environmental groundwater vulnerability assessment in urban water mines (Porto, NW Portugal). Water, 8.","DOI":"10.3390\/w8110499"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"203","DOI":"10.1007\/s40899-019-00302-9","article-title":"Groundwater recharge in urban areas (Porto, NW Portugal): The role of GIS hydrogeology mapping","volume":"5","author":"Afonso","year":"2019","journal-title":"Sustain. Water Resour. Manag."},{"key":"ref_14","first-page":"111","article-title":"Special Issue on Hydrogeological Impacts of Urbanization","volume":"18","author":"Sharp","year":"2012","journal-title":"Environ. Eng. Geosci."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"280","DOI":"10.1016\/j.advwatres.2012.06.015","article-title":"Current research in urban hydrogeology\u2014A review","volume":"51","author":"Schirmer","year":"2013","journal-title":"Adv. Water Resour."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"182","DOI":"10.1111\/1745-5871.12051","article-title":"Coupling hydrotoponymy and GIS cartography: A case study of hydrohistorical issues in urban groundwater systems, Porto NW Portugal","volume":"52","author":"Freitas","year":"2014","journal-title":"Geogr. Res."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"140","DOI":"10.1007\/s12665-019-8167-6","article-title":"Assessment of sustainability of groundwater in urban areas (Porto, NW Portugal): A GIS mapping approach to evaluate vulnerability, infiltration and recharge","volume":"78","author":"Freitas","year":"2019","journal-title":"Environ. Earth Sci."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"490","DOI":"10.1007\/s42452-019-0519-z","article-title":"Coupling groundwater GIS mapping and geovisualisation techniques in urban hydrogeomorphology: Focus on methodology","volume":"1","author":"Freitas","year":"2019","journal-title":"SN Appl. Sci."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Freitas, L., Chamin\u00e9, H.I., Afonso, M.J., Meerkhan, H., Abreu, T., Trigo, J.F., and Pereira, A.J.S.C. (2020). Integrative groundwater studies in a small-scale urban area: Case study from the municipality of Penafiel (NW Portugal). Geosciences, 10.","DOI":"10.3390\/geosciences10020054"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"2881","DOI":"10.1007\/s12665-014-3297-3","article-title":"Assessment of groundwater contamination in an agricultural peri-urban area (NW Portugal): An integrated approach","volume":"73","author":"Barroso","year":"2015","journal-title":"Environ. Earth Sci."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"143","DOI":"10.1111\/j.1936-704X.2016.03226.x","article-title":"Groundwater in urban areas","volume":"159","author":"Hibbs","year":"2016","journal-title":"J. Contemp. Water Res. Educ."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"217","DOI":"10.1007\/s40899-019-00301-w","article-title":"Assessment of urban groundwater: Towards integrated hydrogeological and effects-based monitoring","volume":"5","author":"Guilhermino","year":"2019","journal-title":"Sustain. Water Resour. Manag."},{"key":"ref_23","unstructured":"Sherlock, R.L. (1922). Man as a Geological Agent, H.F. & G. Witherby."},{"key":"ref_24","unstructured":"Legget, R.F. (1973). Cities and Geology, McGraw-Hill."},{"key":"ref_25","unstructured":"Dunne, T., and Leopold, L.B. (1978). Water in Environmental Planning, W.H. Freeman Co."},{"key":"ref_26","unstructured":"Utgard, R.O., McKenzie, G.D., and Foley, D. (1978). Geology in the Urban. Environment, Burgess Publishing Company."},{"key":"ref_27","unstructured":"Leveson, D. (1980). Geology and the Urban. Environment, Oxford University Press."},{"key":"ref_28","first-page":"203","article-title":"Cities and water","volume":"11","author":"Zaporozec","year":"1985","journal-title":"Geo J."},{"key":"ref_29","unstructured":"McCall, G.J., Demulder, E., and Marker, B.R. (1996). Urban. Geoscience, Taylor & Francis."},{"key":"ref_30","unstructured":"Gehrels, H., Peters, N.E., Hoehn, E., Jensen, K., Leibundgut, C., Griffioen, J., Webb, B., and Zaadnoordijk, W.J. (2001). Impact of Human Activity on Groundwater Dynamics, IAHS Press. International Association of Hydrological Sciences, Publication no. 269."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"171","DOI":"10.1016\/S1462-0758(01)00050-4","article-title":"Groundwater in urban areas","volume":"3","author":"Pokrajac","year":"2001","journal-title":"Urban. Water"},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Bocanegra, E., Hern\u00e1ndez, M., and Usunoff, E. (2005). Groundwater and Human Development. International Association of Hydrogeologists Selected Papers, Taylor & Francis.","DOI":"10.1201\/9781439833599"},{"key":"ref_33","doi-asserted-by":"crossref","unstructured":"Ehlen, J., Haneberg, W.C., and Larson, R.A. (2005). Humans as Geologic Agents. Reviews in Engineering Geology, The Geological Society of America.","DOI":"10.1130\/REG16"},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Culshaw, M.G., Reeves, H.J., Jefferson, I., and Spink, T.W. (2009). Engineering Geology for Tomorrow\u2019s Cities, Geological Society. Engineering Geology Special Publications.","DOI":"10.1144\/EGSP22"},{"key":"ref_35","first-page":"33","article-title":"From historical hydrogeological inventory through GIS mapping to problem solving in urban groundwater systems","volume":"38","author":"Afonso","year":"2014","journal-title":"Eur. Geol. J."},{"key":"ref_36","first-page":"16","article-title":"From engineering geosciences mapping towards sustainable urban planning","volume":"41","author":"Teixeira","year":"2016","journal-title":"Eur. Geol. J."},{"key":"ref_37","unstructured":"UN-Habitat [United Nations Human Settlements Programme] (2016). Urbanization and Development: Emerging Futures\u2014World Cities Report 2016, United Nations Human Settlements Programme, World Urban Forum edition."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"104","DOI":"10.2113\/gseegeosci.7.1.104","article-title":"Anthropic rocks as a fourth basic class","volume":"7","author":"Underwood","year":"2001","journal-title":"Environ. Eng. Geosci."},{"key":"ref_39","doi-asserted-by":"crossref","unstructured":"Baker, L.A. (2009). The Water Environment of Cities, Springer Science & Business Media.","DOI":"10.1007\/978-0-387-84891-4"},{"key":"ref_40","first-page":"51","article-title":"The impacts of urbanization on groundwater systems and recharge: Aqua Mundi","volume":"1","author":"Sharp","year":"2010","journal-title":"Aqua Mundi"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"224","DOI":"10.1016\/j.proeng.2017.11.123","article-title":"The Urban Subsurface\u2014From Geoscience and Engineering to Spatial Planning and Management","volume":"209","author":"Gogu","year":"2017","journal-title":"Procedia Eng."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"3","DOI":"10.2113\/gseegeosci.18.1.3","article-title":"Hydrogeological impacts of urbanization","volume":"18","author":"Hibbs","year":"2012","journal-title":"Environ. Eng. Geosci."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"322","DOI":"10.1038\/nclimate1744","article-title":"Ground water and climate change","volume":"3","author":"Taylor","year":"2013","journal-title":"Nat. Clim. Chang."},{"key":"ref_44","unstructured":"Foster, S.D., and Tyson, G. (2016). Global Change & Groundwater, International Association of Hydrogeologists."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"251","DOI":"10.2113\/gseegeosci.14.4.251","article-title":"The secondary permeability of impervious cover","volume":"14","author":"Wiles","year":"2008","journal-title":"Environ. Eng. Geosci."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"225","DOI":"10.1016\/j.jhydrol.2017.02.040","article-title":"Settlements around pumping wells: Analysis of influential factors and a simple calculation procedure","volume":"548","author":"Pujades","year":"2017","journal-title":"J. Hydrol."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"4293","DOI":"10.5194\/hess-23-4293-2019","article-title":"Inundation analysis of metro systems with the storm water management model incorporated into a geographical information system: A case study in Shanghai","volume":"23","author":"Lyu","year":"2019","journal-title":"Hydrol. Earth Syst. Sci."},{"key":"ref_48","unstructured":"IAEA [International Atomic Energy Agency] (1981). Stable Isotope Hydrology. Deuterium and Oxygen-18 in the Water Cycle, IAEA."},{"key":"ref_49","unstructured":"Clark, I.D., and Fritz, P. (1997). Environmental Isotopes in Hydrogeology, Lewis Publishers."},{"key":"ref_50","doi-asserted-by":"crossref","unstructured":"Hoefs, J. (1997). Stable Isotope Geochemistry, Completely Revised. Updated and Enlarged Edition; Springer.","DOI":"10.1007\/978-3-662-03377-7"},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"826","DOI":"10.1007\/s10040-004-0378-5","article-title":"An integration of GIS and remote sensing in groundwater investigations: A case study in Burdur, Turkey","volume":"13","author":"Davraz","year":"2005","journal-title":"Hydrogeol. J."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"899","DOI":"10.1007\/s10040-017-1683-0","article-title":"Use of geospatial technology for delineating groundwater potential zones with an emphasis on water-table analysis in Dwarka River basin, Birbhum, India","volume":"26","author":"Thapa","year":"2018","journal-title":"Hydrogeol. J."},{"key":"ref_53","first-page":"77","article-title":"Urban groundwater protection and management: Lessons from developing cities in Bangladesh and Kyrghyztan","volume":"8","author":"Howard","year":"2002","journal-title":"Current Problems of Hydrogeology in Urban Areas, Urban Agglomerates and Industrial Centres"},{"key":"ref_54","unstructured":"Chilton, J. (1997). Ground-water supply issues in urban and urbanizing areas. Groundwater in the Urban Environment: Problems, Process and Management, A. A. Balkema."},{"key":"ref_55","first-page":"39","article-title":"Urban groundwater and sanitation: Developed and developing countries","volume":"8","author":"Howard","year":"2002","journal-title":"Current Problems of Hydrogeology in Urban Areas, Urban Agglomerates and Industrial Centres"},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"271","DOI":"10.1007\/s10040-010-0681-2","article-title":"Groundwater use in developing cities: Policy issues arising from current trends","volume":"19","author":"Foster","year":"2011","journal-title":"Hydrogeol. J."},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"093004","DOI":"10.1088\/1748-9326\/ab8e8c","article-title":"Groundwater sustainability: A review of the interactions between science and policy","volume":"15","author":"Elshall","year":"2020","journal-title":"Environ. Res. Lett"},{"key":"ref_58","unstructured":"INE\u2014Instituto Nacional de Estat\u00edstica (2019, January 30). Statistical Information about Portuguese Population: Porto City, Available online: http:\/\/www.ine.pt\/."},{"key":"ref_59","unstructured":"Caetano, M., Igreja, C., Marcelino, F., and Costa, H. (2019, February 28). Estat\u00edsticas e Din\u00e2micas Territoriais Multiescala de Portugal Continental 1995\u20132007\u20132010 com Base na Carta de Uso e Ocupa\u00e7\u00e3o do Solo (COS). Relat\u00f3rio T\u00e9cnico. Dire\u00e7\u00e3o-Geral do Territ\u00f3rio (DGT). Available online: http:\/\/www.dgterritorio.pt\/."},{"key":"ref_60","first-page":"173","article-title":"Hidrogeologia de rochas gran\u00edticas da regi\u00e3o do Porto (NW de Portugal)","volume":"28","author":"Afonso","year":"2003","journal-title":"Cad. Lab. Xeol. Laxe"},{"key":"ref_61","unstructured":"Afonso, M.J. (2011). Hidrogeologia e Hidrogeoqu\u00edmica da Regi\u00e3o Litoral Urbana do Porto, entre Vila do Conde e Vila Nova de Gaia (NW de Portugal): Implica\u00e7\u00f5es Geoambientais. [Ph.D. Thesis, Instituto Superior T\u00e9cnico da Universidade T\u00e9cnica de Lisboa]."},{"key":"ref_62","first-page":"271","article-title":"Urban groundwater resources: A case study of Porto City in northwest Portugal","volume":"8","author":"Howard","year":"2007","journal-title":"Urban Groundwater: Meeting the Challenge. International Association of Hydrogeologists Selected Papers"},{"key":"ref_63","unstructured":"Pereira, E., Ribeiro, A., Carvalho, G.S., Noronha, F., Ferreira, N., and Monteiro, J.H. (1989). Carta Geol\u00f3gica de Portugal, escala 1\/200000. Folha 1, Servi\u00e7os Geol\u00f3gicos de Portugal."},{"key":"ref_64","first-page":"37","article-title":"Tectonoestratigrafia da faixa de cisalhamento de Porto\u2013Albergaria-a-Velha\u2013Coimbra\u2013Tomar, entre as Zonas Centro-Ib\u00e9rica e de Ossa-Morena (Maci\u00e7o Ib\u00e9rico, W de Portugal)","volume":"28","author":"Fonseca","year":"2003","journal-title":"Cad. Lab. Xeol. Laxe"},{"key":"ref_65","doi-asserted-by":"crossref","first-page":"1","DOI":"10.5038\/1827-806X.39.1.1","article-title":"Urban speleology applied to groundwater and geo-engineering studies: Underground topographic surveying of the ancient Arca D\u2019\u00c1gua galleries catchworks (Porto, NW Portugal)","volume":"39","author":"Afonso","year":"2010","journal-title":"Int. J. Speleol."},{"key":"ref_66","first-page":"79","article-title":"Geomorfologia e geologia regional do sector de Porto-Espinho (W de Portugal): Implica\u00e7\u00f5es morfoestruturais na cobertura sedimentar Cenoz\u00f3ica","volume":"28","author":"Gomes","year":"2003","journal-title":"Cad. Lab. Xeol. Laxe"},{"key":"ref_67","unstructured":"Struckmeier, W.F., and Margat, J. (1995). Hydrogeological Maps: A Guide and a Standard Legend, International Association of Hydrogeologists."},{"key":"ref_68","doi-asserted-by":"crossref","unstructured":"Assaad, F.A., LaMoreaux, P.E., Hughes, T.H., Wangfang, Z., and Jordan, H. (2004). Field Methods for Geologists and Hydrogeologist, Springer.","DOI":"10.1007\/978-3-662-05438-3"},{"key":"ref_69","unstructured":"Carr\u00edngton da Costa, J., and Teixeira, C. (1957). Carta Geol\u00f3gica de Portugal na escala de 1\/50000. Not\u00edcia Explicativa da Folha 9-C (Porto), Servi\u00e7os Geol\u00f3gicos de Portugal."},{"key":"ref_70","unstructured":"Teixeira, C., and Medeiros, A.C. (1965). Carta geol\u00f3gica de Portugal na escala 1:50000. Not\u00edcia explicativa da folha 9A-P\u00f3voa de Varzim, Servi\u00e7os Geol\u00f3gicos de Portugal."},{"key":"ref_71","unstructured":"Pedrosa, M.Y. (1999). Not\u00edcia explicativa da Carta Hidrogeol\u00f3gica de Portugal, \u00e0 escala 1\/200000. Folha 1, Instituto Geol\u00f3gico e Mineiro."},{"key":"ref_72","unstructured":"Carvalho, J.M. (2006). Prospec\u00e7\u00e3o e Pesquisa de Recursos H\u00eddricos Subterr\u00e2neos no Maci\u00e7o Antigo Portugu\u00eas: Linhas Metodol\u00f3gicas. [Ph.D. Thesis, Universidade de Aveiro]."},{"key":"ref_73","doi-asserted-by":"crossref","first-page":"213","DOI":"10.1016\/0016-7037(53)90051-9","article-title":"Variations of 18O content of waters from natural sources","volume":"4","author":"Epstein","year":"1953","journal-title":"Geochim. Cosmochim. Acta"},{"key":"ref_74","doi-asserted-by":"crossref","first-page":"89","DOI":"10.1016\/0016-7037(53)90066-0","article-title":"Deuterium content of natural waters and other substances","volume":"4","author":"Friedman","year":"1953","journal-title":"Geochim. Cosmochim. Acta"},{"key":"ref_75","unstructured":"IAEA [International Atomic Energy Agency] (1976). Procedure and Technique Critique for Tritium Enrichment by Electrolysis at IAEA Laboratory, IAEA. Technical Procedure No. 19."},{"key":"ref_76","doi-asserted-by":"crossref","first-page":"541","DOI":"10.6028\/jres.105.043","article-title":"Comprehensive review and critical evaluation of the half-life of tritium","volume":"105","author":"Lucas","year":"2000","journal-title":"J. Res. Natl. Inst. Stand. Technol."},{"key":"ref_77","doi-asserted-by":"crossref","first-page":"2817","DOI":"10.1016\/j.apgeochem.2008.04.004","article-title":"Radiocarbon application in dating \u201ccomplex\u201d hot and cold CO2-rich mineral water systems: A review of case studies ascribed to the northern Portugal","volume":"23","author":"Carreira","year":"2008","journal-title":"Appl. Geochem."},{"key":"ref_78","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1016\/j.jvolgeores.2009.10.008","article-title":"Mantle-derived carbon in Hercynian granites Stable isotopes signatures C\/He associations in the thermomineral waters N-Portugal","volume":"189","author":"Carreira","year":"2010","journal-title":"J. Volcanol. Geotherm. Res."},{"key":"ref_79","doi-asserted-by":"crossref","first-page":"519","DOI":"10.1029\/TR016i002p00519","article-title":"The relation between lowering of the piezometric surface and rate and duration of discharge of a well using ground-water storage","volume":"16","author":"Theis","year":"1935","journal-title":"Trans. Am. Geophys. Union"},{"key":"ref_80","doi-asserted-by":"crossref","first-page":"526","DOI":"10.1029\/TR027i004p00526","article-title":"A generalized graphical method for evaluating formation constants and summarizing well-field history","volume":"27","author":"Cooper","year":"1946","journal-title":"Trans. Am. Geophys. Union"},{"key":"ref_81","unstructured":"Kruseman, G.P., and de Ridder, N.A. (1990). Analysis and Evaluation of Pumping Test. Data, International Institute for Land Reclamation and Improvement. [2nd ed.]."},{"key":"ref_82","unstructured":"Sterrett, R.J. (2007). Groundwater and Wells, Johnson Screens, A Weatherford Company. [3rd ed.]."},{"key":"ref_83","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1111\/j.1745-6584.1964.tb01744.x","article-title":"Estimating transmissibility from routine production tests of water wells","volume":"2","author":"Logan","year":"1964","journal-title":"Ground Water"},{"key":"ref_84","doi-asserted-by":"crossref","unstructured":"Malczewski, J., and Rinner, C. (2015). Multicriteria Decision Analysis in Geographic Information Science, Springer.","DOI":"10.1007\/978-3-540-74757-4"},{"key":"ref_85","unstructured":"Custodio, E., and Llamas, M.R. (2001). Hidrolog\u00eda Subterr\u00e1nea, Ediciones Omega. Segunda Edici\u00f3n Corregida."},{"key":"ref_86","unstructured":"Younger, P.L. (2007). Groundwater in the Environment: An Introduction, Blackwell Publishing."},{"key":"ref_87","unstructured":"MA\u2014Minist\u00e9rio do Ambiente (1998). Decreto-Lei n\u00ba 236\/98, de 1 de Agosto. Di\u00e1rio da Rep\u00fablica\u2014I S\u00e9rie-A, N\u00ba 176."},{"key":"ref_88","unstructured":"Pedrosa, M.Y. (1998). Carta Hidrogeol\u00f3gica de Portugal, \u00e0 escala 1\/200000. Folha 1, Instituto Geol\u00f3gico e Mineiro."},{"key":"ref_89","doi-asserted-by":"crossref","first-page":"1702","DOI":"10.1126\/science.133.3465.1702","article-title":"Isotopic variations in meteoric waters","volume":"133","author":"Craig","year":"1961","journal-title":"Science"},{"key":"ref_90","doi-asserted-by":"crossref","unstructured":"Swart, P.K. (1993). Isotopic patterns in modern global precipitation. Climate Change in Continental Isotopic Records, Geoph. Monog. Series, AGU.","DOI":"10.1029\/GM078"},{"key":"ref_91","doi-asserted-by":"crossref","first-page":"315","DOI":"10.1130\/0091-7613(2002)030<0315:SDOOIM>2.0.CO;2","article-title":"Spatial distribution of \u03b418O in meteoric precipitation","volume":"30","author":"Bowen","year":"2002","journal-title":"Geology"},{"key":"ref_92","doi-asserted-by":"crossref","first-page":"4713","DOI":"10.5194\/hess-17-4713-2013","article-title":"Global isoscapes for \u03b418O and \u03b42H in precipitation: Improved prediction using regionalized climatic regression models","volume":"17","author":"Terzer","year":"2013","journal-title":"Hydrol. Earth. Syst. Sci."},{"key":"ref_93","unstructured":"Carreira, P.M., Ara\u00fajo, M.F., and Nunes, D. (2005). Isotopic composition of rain and water vapour samples from Lisbon region: Characterization of monthly and daily events. IAEA-TECDOC-1453 Isotopic Composition of Precipitation in the Mediterranean Basin in Relation to Air Circulation Patterns and Climate, IAEA."},{"key":"ref_94","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1016\/j.watres.2004.07.026","article-title":"Non-agricultural sources of groundwater nitrate: A review and case study","volume":"39","author":"Wakida","year":"2005","journal-title":"Water Res."},{"key":"ref_95","unstructured":"Samper, J., Leit\u00e3o, T., Fern\u00e1ndez, L., and Ribeiro, L. (2000). Contamina\u00e7\u00e3o das \u00e1guas subterr\u00e2neas no Norte de Portugal. Las Aguas Subterr\u00e1neas en el Noroeste de la Pen\u00ednsula Ib\u00e9rica, A Coru\u00f1a. AIH-Grupo Espa\u00f1ol & APRH. ITGE. Textos de las Jornadas, Mesa Redonda y Comunicaciones."},{"key":"ref_96","unstructured":"Pedrosa, M.Y., Brites, J.A., and Pereira, A.P. (2002). Carta das Fontes e do Risco de Contamina\u00e7\u00e3o da Regi\u00e3o de Entre-Douro-e-Minho. Folha Sul, Escala 1\/100000, Nota Explicativa, Instituto Geol\u00f3gico e Mineiro."},{"key":"ref_97","doi-asserted-by":"crossref","first-page":"960","DOI":"10.1016\/j.foodchem.2009.11.030","article-title":"Contribution of different vegetable types to exogenous nitrate and nitrite exposure","volume":"120","author":"Correia","year":"2010","journal-title":"Food Chem."},{"key":"ref_98","first-page":"177","article-title":"A ac\u00e7\u00e3o da \u00e1gua da chuva na meteoriza\u00e7\u00e3o de monumentos gran\u00edticos","volume":"4","author":"Borges","year":"1995","journal-title":"IV Congresso Nacional de Geologia. Mem\u00f3rias do Museu e Laborat\u00f3rio Mineral\u00f3gico e Geol\u00f3gico da Faculdade de Ci\u00eancias da Universidade do Porto"},{"key":"ref_99","unstructured":"Begonha, A. (2001). Meteoriza\u00e7\u00e3o do Granito e Deteriora\u00e7\u00e3o da Pedra em Monumentos e Edif\u00edcios da Cidade do Porto, Colec\u00e7\u00e3o monografias, FEUP Edi\u00e7\u00f5es."},{"key":"ref_100","unstructured":"Carreira, P.M., Val\u00e9rio, P., Nunes, D., and Ara\u00fajo, M.F. (2004, January 25\u201329). Temporal and seasonal variations of stable isotopes (2H and 18O) and tritium in precipitation over Portugal. Proceedings of the Isotopes in Environmental Studies\u2014Aquatic Forum, Monte Carlo, Monaco."},{"key":"ref_101","doi-asserted-by":"crossref","first-page":"125","DOI":"10.1007\/s100400100133","article-title":"The value of simple equilibrium approximations for analysing pumping test data","volume":"9","author":"Misstear","year":"2001","journal-title":"Hydrogeol. J."},{"key":"ref_102","first-page":"77","article-title":"Hydrodynamic constraints of the Porto urban area crystalline bedrock (NW Portugal, Iberian Massif): Implications on groundwater resources","volume":"Volume 2","author":"Stournaras","year":"2005","journal-title":"Proceedings of the 7th Hellenic Hydrogeological Conference and 2nd MEM Workshop on Fissured Rocks Hydrology"},{"key":"ref_103","unstructured":"L\u00f3pez-Geta, J.A. (2005). Productivity and water cost in fissured-aquifers from the Iberian crystalline basement (Portugal): Hydrogeological constraints. Water, Mining and Environment. Book Homage to Professor Rafael Fern\u00e1ndez Rubio, Instituto Geol\u00f3gico y Minero de Espa\u00f1a."},{"key":"ref_104","unstructured":"Larsson, I. (1984). Groundwater in Hard Rocks. Studies and Reports in Hydrology, UNESCO."},{"key":"ref_105","doi-asserted-by":"crossref","unstructured":"Wright, E.P., and Burgess, W.G. (1992). The Hydrogeology of Crystalline Basement in Africa, GSL. Geological Society Special Publication, 68.","DOI":"10.1144\/GSL.SP.1992.066.01.01"},{"key":"ref_106","unstructured":"Lloyd, J.W. (1999). Water Resources of Hard Rock Aquifers in Arid and Semi-arid Zones, UNESCO. Studies and Reports in Hydrology, 58."},{"key":"ref_107","doi-asserted-by":"crossref","unstructured":"Robins, N.S., and Misstear, B.D.R. (2000). Groundwater in the Celtic Regions: Studies in Hard Rock and Quaternary Hydrogeology, Geological Society of London.","DOI":"10.1144\/GSL.SP.2000.182.01.02"},{"key":"ref_108","doi-asserted-by":"crossref","unstructured":"Stober, I., and Bucher, K. (2000). Hydrogeology of Crystalline Rocks, Kluwer Academic Publishers. Water Science and Technology Library.","DOI":"10.1007\/978-94-017-1816-5"},{"key":"ref_109","doi-asserted-by":"crossref","unstructured":"Kr\u00e1sn\u00fd, J., and Sharp, J.M. (2007). Hydrogeology of fractured rocks from particular fractures to regional approaches: State-of-the-art and future challenges. Groundwater in Fractured Rocks. International Association of Hydrogeologists Selected Papers, Taylor & Francis Group.","DOI":"10.1201\/9780203945650-6"},{"key":"ref_110","doi-asserted-by":"crossref","unstructured":"Singhal, B.B.S., and Gupta, R.P. (2010). Applied Hydrogeology of Fractured Rocks, Springer. [2nd ed.].","DOI":"10.1007\/978-90-481-8799-7"},{"key":"ref_111","unstructured":"Gustafson, G. (2012). Hydrogeology for Rock Engineers, BeFo."},{"key":"ref_112","doi-asserted-by":"crossref","unstructured":"Sharp, J.M. (2014). Fractured Rock Hydrogeology, CRC Press.","DOI":"10.1201\/b17016"},{"key":"ref_113","doi-asserted-by":"crossref","unstructured":"Ofterdinger, U., Macdonald, A.M., Comte, J.C., and Young, M.E. (2019). Groundwater in Fractured Bedrock Environments: Managing Catchment and Subsurface Resources, Geological Society.","DOI":"10.1144\/SP479-2018-170"},{"key":"ref_114","unstructured":"Freitas, L. (2019). Avalia\u00e7\u00e3o Integrada de Recursos H\u00eddricos em \u00c1reas Urbanas: Aplica\u00e7\u00f5es Para a Sustentabilidade e o Ordenamento Territorial. [Ph.D. Thesis, Faculdade de Ci\u00eancias e Tecnologia da Universidade de Coimbra]."},{"key":"ref_115","first-page":"161","article-title":"Prospec\u00e7\u00e3o e pesquisa de recursos hidrominerais e de \u00e1gua de nascente no Maci\u00e7o Antigo Portugu\u00eas","volume":"42","author":"Carvalho","year":"2007","journal-title":"Boletim e Minas"},{"key":"ref_116","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1016\/S0341-8162(02)00016-4","article-title":"Weathering of the Oporto granite: Geotechnical and physical properties","volume":"49","author":"Begonha","year":"2002","journal-title":"Catena"},{"key":"ref_117","unstructured":"IAH [International Association of Hydrogeologists] (2020, June 30). The UN-SDGs for 2030: Essential Indicators for Groundwater. Available online: https:\/\/iah.org\/wp-content\/uploads\/2017\/04\/IAH-Groundwater-SDG-6-Mar-2017.pdf."}],"container-title":["Water"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2073-4441\/12\/10\/2797\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T10:17:53Z","timestamp":1760177873000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2073-4441\/12\/10\/2797"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,10,9]]},"references-count":117,"journal-issue":{"issue":"10","published-online":{"date-parts":[[2020,10]]}},"alternative-id":["w12102797"],"URL":"https:\/\/doi.org\/10.3390\/w12102797","relation":{},"ISSN":["2073-4441"],"issn-type":[{"value":"2073-4441","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,10,9]]}}}