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Hydrogeology of volcanic rocks Hydrogéologie des roches volcaniques • SIHD • SIHD 14-17 December 2008 Djibouti 14-17 Décembre 2008 Djibouti Republic of Djibouti République de Djibouti Hydrogeology of volcanic rocks 1 SIHD-2008 DJIBOUTI Hydrogéologie des roches volcaniques 2 Hydrogeology of volcanic rocks SIHD-2008 DJIBOUTI Hydrogéologie des roches volcaniques SOMMAIRE Hydrogeological system framework of the middle Awash Basin, MER PhD Proceeding ………………………………………………………………………………7 Furi W., The period of pumping test in heterogenous aquifers……………………………….........13 Gholam Hossein Karami Qualité chimique et recharge des systèmes aquifères de Djibouti1………………………15 H. Bouh 1 Hydrogeology of an active volcanic island: Montserrat, West Indies…………………....21 Darling W.G. Influences of lithology and geological structures on groundwater in volcanic areas of Cameroon:Cameroon Volcanic Line (CVL) and Adamawa plateau………..………...27 Alexandre NONO Characterization of volcanic aquifers and assessment of the movement of groundwater in the Upper Awash Basin, Central Ethiopia………………………………31 Andarge Yitbarek First results from the hydrogeological experimental site in a volcanic aquifer. Mawari regional Project. Republic of Djibouti (Horn of Africa)………………………...37 Mohamed Jalludin Hydrodynamical characterization of the Gulf basalts aquifer using slug tests and long term pumping tests at the Atar research site (Republic of Djibouti)………….45 Houmed-Gaba A Synthesis of the Canary Islands hydrogeology…………………………………………….51 E. Custodio Exploring hydrodynamics of volcanic aquifers trough detailed analysis of pumping tests data………………………………………………………………………..57 B.Dewandel Geophysical studies of the shallow structure beneath the Lake Nakuru basin, Central Kenya Rift………………………………………………59 J. O. Barongo Relation between a deep aquifer and the complex fractured basalt bedrock revealed by 3-D magnetotelluric in the Djibouti Plain, Republic of Djibouti…………...61 Hautot Sophie 2-D resistivity imaging survey for water-supply tube wells in a basement complex: a case study of OOU Campus, Ago-Iwoye Sw Nigeria……………………………………67 AYOLABI Hydrogeology of volcanic rocks 3 SIHD-2008 DJIBOUTI Hydrogéologie des roches volcaniques 3D electrical resistivity imaging of the Atar hydrological experimental site, Rebublic of Djibouti…………………………………………………………………………73 HASSAN M. Volcanic islands hydrology, new techniques new insights : The Galapagos case……….79 Ghislain de Marsily Geology and structures of the lake Nakuru basin and their implications to the hydrogeology of the basin………………………………………………………….……......81 Mathu, E.M. The Lake Langano-Lake Shala corridor: area for possible hydraulic connection between the two lakes…………………………………………………………83 Tagel Assefa Hydrogeologic surveys in Djibouti, Africa………………………………………………...85 Saenz, Joseph M The deep structure of the Djibouti Plain in the Afar rift framework……………………87 Le Gall Bernard Magmatic and tectonics features of the Djibouti Plain in the SE of the Afar Triangle…………………………………………………………………91 Mohamed A. Daoud Le CO2 et les eaux souterraines dans le Campo de Calatrava (Ciudad Real, Espagne)…………………………………………………………95 Antonio Pulido Bosch1 Groundwater geochemistry in lake Nakuru basin, Kenya………………………………101 Isaack K. Kanda Hydrochemical and isotopic characteristics of groundwater in the Gulf Basalts costal aquifer. Republic of Djibouti……………………………………103 Houmed-Gaba A. Estimation of groundwater recharge for a volcanic aquifer catchment located in sub-humid tropical climate: Comparison of results from two non-calibrated recharge estimation techniques……………………………………..111 Molla Demlie On the mechanism of groundwater recharge and salinization in a semi arid fractured basement aquifer of Dodoma – Tanzania………………………..117 Hudson Nkotagu Recharge simulation in stream bed alluviums overlying volcanic aquifers under arid climate. Republic of Djibouti (Horn of Africa)…………………....123 M. Jalludin 4 Hydrogeology of volcanic rocks SIHD-2008 DJIBOUTI Hydrogéologie des roches volcaniques Subsurface Storage Evaluation Towards Groundwater Resource Augmentation to Cope with Climate Extremes -A Study From Lower Kantli River Basin, Rajasthan, INDIA…………………………………………...129 A. K. Sinha Physicochemical Quality of Groundwater on the Hard Rock Region of Benin (West Africa)……………………………………………………………………..133 Totin V. S.H. Chararacteristics and Management of Soils Derived from Volcanic Rocks In River Njoro Watershed, Lake Nakuru Basin…………………………………………….141 S. N. Wanjogu Numerical modeling of the Gulf basalts aquifer. Republic of Djibouti………………...143 Abdouraham Houmed G. Impacts of climate variability and land use change on catchment runoff in Meki river basin, Main Ethiopian Rift………………………………………………...149 Hawi Abate Estimation of equivalent permeability in Amirkabir tunnel alignment with neural network ……………………………………………………………………….153 A.A.Anvari Groundwater flow model and groundwater age distribution in the Upper Awash Basin Ethiopia……………………………………………………………………...155 Seifu Kebede Geochemical signatures in the Ethiopian geothermal resources………………………..156 Berhanu GIZAW Borehole geology and alteration mineralogy of well Asal 5, Republic of Djibouti.........161 Moustapha Ahmed Minéralisations d’or épithermal dans un rift en cours d’océanisation : exemple de Djibouti………………………………………………………………………..163 Moussa, N Study of the Geothermal Energy Resources in (Alisi and Esbil Area –Dammar Province)Republic Of Yemen By Using The Remote Sensing And Gis………………...171 Ali Sabri Lumped Parameter Modeling Of Pressures Changes In Well Asal 3, Republic Of Djibouti……………………………………………………..173 Daher Elmi Hydrological consequences of climate change and demographic growth on water scarcity issues in the World……………………………………………………..181 Ghislain de Marsily Hydrogeology of volcanic rocks 5 SIHD-2008 DJIBOUTI Hydrogéologie des roches volcaniques Sustainable Management of Percolation Lakes in Volcanic, Semi- Arid, Basaltic Terrain in Western India and the Role of UNESCO-IUGS-IGCP Project ‘GROWNET’…………………………………………...183 Shrikant D Limaye. Hydrogeological parameters and sustainability of ground water in Uganda. A case of Ankole-Masaka corridor, South Western Uganda……………....187 Abel Tumusiime Hydro-Geoelectrical Study in Hong and its Environs, Northeast Nigeria……………...189 A. Nur Water policies and institutional issues……………………………………………………195 Oyule Ngata Sustainable Groundwater Management in the East African Rift the MAWARI Partnership……………………………………......197 Cheikh Bécaye Gaye Partnerships towards sustainable utilization of groundwater in Africa………………..199 Emmanuel Naah Strategies de la gestion des ressources en eau en mileu rural en Republique de Djibouti…………………………………………………………………….201 Said Kaireh Youssouf Use of the resistivity sounding and imaging techniques in the study of groundwater in volcanic rocks………………………………………………207 Bernard J ACP Science & Technology Programme………………………………………………....213 Pinard Hydrogeology of a Buried Channel, Village Shenoli, District Satara, Maharashtra, (India)…………………………………………………….215 A.K.Sinha˙ Managed Aquifer Recharge– A Succour For The Water Stressed Aquifers Of Sabarmati Basin Gujarat And Its Potential For Energy Savings And Carbon Credits……………………………………………………..219 A.K.Sinha Relationship between petrology and trace element concentrations in the Ethiopian rift volcanics………………………………………………………………..225 Gezahegn Yirgu 6 Hydrogeology of volcanic rocks SIHD-2008 DJIBOUTI Hydrogéologie des roches volcaniques Hydrogeological system framework of the middle Awash Basin, MER PhD Proceeding Furi W. 1, Razack M. 2, Travi Y. 3, Legesse D. 4, and Alemayehu T. 5 1,2University de Poitiers (HYDRASA), 86000 Poitiers, France, 3University d’Avignon, 84100 Avignon, France, 4Addis Ababa University, 1176 Addis Ababa, Ethiopia, 5University of the Witwatersrand, Wits 2050, Johannesburg, South Africa Abstract The prominent topographic range in middle Awash River basin brought in spatial variation of meteorological elements. The distribution and amount of rainfall over the study area is tailored by orographic effects and considerably influenced at larger extent by topographic setup. Volcano clastics are the major geologic units in rift floor whereas the massive volcanics of trachy-basalts and ignimbrite constitute the escarpments and plateau areas. Hydrological inflow to the area generally constrained in south-west and groundwater productivity, depth of occurrence and its chemistry are greatly controlled by the orientation and extent of rift faults. A grow in groundwater table by 13 meters over the last five decades took place at Wonji irrigation fields implying the development of water table mound by voluminous accretion of return water from excess irrigation water. All waters including Sodere and Wonji thermal waters have Na and HCO 3 as major chemical constituent with elevated level of C0 2 and silica in thermal waters resulted from interaction of waters from silicate volcanic aquifers in more acidic and oxic environment with C0 2 rich gas from deep mantle. Key Word: Hydrology, Wonji, groundwater, volcanic aquifer, Irrigation, Awash River Introduction The study area is located in the Main Ethiopian Rift (MER) within the geographic coordinate of 7 0, 50’ to 9 0, 30’N and 38 0, 55’ to 40 0, 45’E and has an area 19,297 Sq km (Fig 1). The Miocene massive geological process of the rift (Kinnard, 1998 et Williams et al., 2004) generates the buildup of three distinct slices of geomorphologic series as plateau, escarpment and rift floor that range in altitude from 4200 to 700 m.a.s.l. This variation in physiography forms three distinct climatic