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Hydrogeology of Adigrat and Surrounding Areas Eastern Tigray, Northern Ethiopia

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Hydrogeology of Adigrat and Surrounding Areas Eastern Tigray, Northern Ethiopia ADDIS ABABA UNIVERSITY SCHOOL OF GRADUATE STUDIES DEPARTMENT OF EARTH SCIENCES HYDROGEOLOGY OF ADIGRAT AND SURROUNDING AREAS EASTERN TIGRAY, NORTHERN ETHIOPIA A THESIS SUBMITTED TO THE SCHOOL OF GRADUATE STUDIES IN PARTIAL FULFILLMENT FOR THE DEGREE OF MASTER OF SCIENCE IN HYDROGEOLOGY BY NIKODIMOS KASSAYE JUNE 2006 ADDIS ABABA ACKNOWLEDGEMENTS I am highly indebted to the Tigray Water Works Consrtuction Enterprise for sponsoring me to attend my postgraduate study and its logistic and financial support during my fieldwork periods. My great credit goes to my advisor Dr. Tenalem Ayenew, for his comments in my research works. I duly acknowledge Dr. Asfawossen Asrat, staff of the department of Earth Science AAU, Ato Tesfamichael, staff of the department of Applied geology, Mekelle University, for their readiness in providing me the material they could. Many institutes that helped me in providing me data and materials deserve especial thanks. Among them, Tigray Water Resource Bureau, Tigray office of mine, National Metrological Service Agency (NMSA), Ezana Mining Development PLC, Ganta Afeshum woreda Health Department, Adigrat town water and sewage authority and Tigray eastern zone water resources department. I am great full to my friend Asmelash Meressa, for his continuous morale and encouragement during my postgraduate study. His unlimited support in allowing me to use his personal computer is greatly acknowledged. Especial thanks go to my friend Mussie Araya for his valuable help in developing my maps using GIS techniques. Among others, my thanks goes to Esayas T/Birhan,Samuel yehdego, Shewaye Beyene, G/Medhin Birhane, Solomon G/Michael, Fethanegest W/Mariam, H/Mariam Hailu and other who helped me in various ways. Last but not least, my deepest heart felt thanks go to my family for their morale and encouragement that brought me to this level. God bless them. I ABSTRACT The study area has a total surface area of 152km2 with a wide difference in altitude ranging from 2000 m.a.s.l to 3000 m.a.s.l (meters above sea level). The high altitude topography mainly occupies the western scarp of the study area. The central and eastern parts in turn have rugged topography with flat to gentle slopes. The paleozoic-mesozoic sedimentary rocks cover larger part of the study area. The dominant lithological units in the area are the alluvial sediments unit, the tertiary basalt unit, the Adigrat sandstone unit, the Edagaarbi glacial unit, the Enticho sandstone unit and the metamorphic rocks unit.The main structures of the area are sedimentary beds, cross bedding, fracture/joint sets and foliation. From long term mean monthly rainfall data, the area receives 694mm mean annual rainfall. The potential evapotranspiration of the area calculated using the Penman combined method is 1261mm.The actual evapotranspiration computed by the Thorthwaite-Mathes soil balance model is 583mm. The mean annual surface run off that leaves the catchment is 62mm of water. The amount of groundwater recharge is 46.4mm. Based on pumping test data analysis results and additional qualitative field descriptions such as degree of weathering, extent and frequency of fractures, the rocks in the study area are classified in to four hydrogeological units These are rocks with high permeability (K>1.45m/d), rocks with high to medium permeability (K=1.45m/d to 0.15m/d), rocks with medium to low permeability (K= 0.15m/d to 0.09m/d) and rocks with very low permeability (K<0.09m/d). The highly permeable lithology corresponds to the alluvial sediments and fractured Enticho sandstone. The Edagaarbi glacial and the Adigrat sandstone rock units that occupy high topography area with steep slope are under the very low permeability group. Hydrochemical study indicated the presence of two major water types in the study area. These are Ca-Mg-HCO3 and Ca-Na-HCO3. One borehole water sample shows Ca and NO3 as dominant cation and anions respectively. The high nitrate concentration in the borehole is attributed to II contamination by domestic wastes. Bacteriological analysis result conducted in the years 2000 and 2005 indicated the presence of E.coli and coliform bacteria, above permissible limit for drinking, in a borehole that supply water to the residences of Adigrat town. With exception of the above, the groundwater quality with respect to drinking, agricultural and industrial water quality standards is within the permissible limits set by different organizations. However, it has some limitations for textile and paper manufacturing plants. III TABLE OF CONTENTS Acknowledgements I Abstract II Table of contents IV List of figures VI List of tables VII List of annexes IX CHAPTER 1 INTRODUCTION 1 1.1 Back ground 1 1.2 Objective 2 1.3 Methodology 2 1.4 Materials used 3 1.5 Application of the result 4 CHAPTER 2 GENERAL OVER VIEW OF THE STUDY AREA 5 2.1 Location and accessibility 5 2.2 Topography 5 2.3 Land use, land cover and soils 7 2.4 Climate 9 CHAPTER 3 GEOLOGY 10 3.1 Regional geology 10 3.1.1 Precambrian rock 10 3.1.2 Precambrian intrusive rocks 11 3.1.3 Upper Paleozoic-Mesozoic rocks 12 3.1.4 Mesozoic rocks 12 3.1.5 Tertiary rock 13 3.1.6 Cainzoic sediments, Holocene & Tertiary Intrusive rocks 13 3.2 Regional structures 13 3.3 Local geology 15 3.3.1 Alluvial Deposit 15 IV 3.3.2 Trap basalt 15 3.3.3 Adigrat sandstone 16 3.3.4 Edagaarbi glacial 17 3.3.5 Enticho sandstone 18 3.3.6 Metamorphic rocks 20 3.3.7 Dolerite Dyke 22 3.4 Geological structures. 23 CHAPTER 4 HYDROMETEOROLOGY 27 4.1 General 27 4.2 Precipitation 27 4.2.1 Mean aerial precipitation 27 4.2.2 Monthly distribution of rainfall Variability 30 4.2.3 Rainfall variability 31 4.3 Temperature 32 4.4 Relative humidity 32 4.5 Wind speed 32 4.6 Sun shine 33 4.7 Evapotranspiration 33 4.7.1 Potential evapotranspiration 34 4.7.2 Actual evapotranspiration 36 4.8 Runoff 43 4.8.1 Run off and its computation 43 4.8.2 Base flow separation. 44 4.8.3 Rainfall-runoff relationship 46 4.9 Water Balance 47 CHAPTER 5 HYDROGEOLOGY 49 5.1 Introduction 49 5.2 Hydrolithostratigraphy 49 5.2.1 Aquifer permeability: high 52 V 5.2.2 Aquifer permeability: high to medium 54 5.2.3 Aquifer permeability: medium to low 54 5.2.4 Aquifer permeability: very low 56 5.3 Aquifer hydraulic parameters 58 5.3.1 Pump test analysis 58 5.4 Groundwater movement, recharge & discharge 64 CHAPTER 6 HYDROCHEMISTRY 67 6.1 Introduction 67 6.2 Water sampling and analysis 67 6.3 Water analysis results 72 6.4 Data interpretation 74 6.5 Water type classification 77 6.5.1 Classification based on dominate cations and anions 77 6.5.2 Classification based on TDS value 78 6.5.3 Classification based on hardness 78 6.6 Water quality 79 6.6.1 Drinking water quality 79 6.6.2 Agricultural water quality 80 6.6.3 Industrial water quality 84 CHAPTER 7 CONCLUSIONS AND RECOMMENDATIONS 86 7.1 Conclusions 86 7.2 Recommendations 89 REFERENCES 90 ANNEXES LIST OF FIGURES Fig 2.1 Location map of the study area 6 Fig 2.2 Land use, land cover map of the area 7 VI Fig 2.3 Soil map of the area 8 Fig 2.4 Drainage map of the area 9 Fig 3.1 An exposure of the alluvial sediment 14 Fig 3.2 An exposure of Aiba basalt,Adigrat sandstone and Edagaarbi glacial 17 Fig 3.3 An out crop of Enticho sandstone 20 Fig 3.4 an out crop of metasediment 21 Fig 3.5 Out crop of granite 22 Fig 3.6 Basaltic dyke 23 Fig 3.7 Geological map of the study area 25 Fig 3.8 Geological cross section along A-A” 26 Fig 4.1 Isohyetal map of the study area 29 Fig 4.2 Long term mean monthly rain fall variation of the area 30 Fig 4.3Temporal variation of annual sum rain fall 31 Fig 4.4 Simulated mean monthly hydrograph of the area 44 Fig 4.5 Hydrograph base flow separation map 46 Fig 4.6 Relationship between rainfall and run off 47 Fig 4.7 Monthly water balance plot 48 Fig 5.1 Hydro geological map of the study area 61 Fig 5.2 Hydrogeological cross section along A-A” 62 Fig 5.3 Groundwater flow map 64 Fig 6.1 Relation ship between TDS and EC 71 Fig 6.2 Piper tri-linear plots of water samples 77 LIST OF TABLES Table 3.1 Structures in Enticho sandstone 24 Table 3.2 Structures in Adigrat sandstone 24 Table 3.3 structures in metavolcanic 24 Table 4.1 location of rainfall stations 29 Table 4.2 Monthly percentage contribution of rainfall 30 Table 4.3 Mean monthly designation 31 Table 4.4 Summary of metrological elements 33 VII Table 4.5 Computation of evaporation using Penman combination method 35 Table 4.6 Computation of evaporation using Penman combination method 36 Table 4.7 Computation of evapotranspiration using Penman combination method 37 Table 4.8 Computation of actual evapotranspiration for max. available soil moisture of 150mm (Sandy-loam + shallow-rooted crops) 38 Table 4.9 Computation of actual evapotranspiration for max. available soil moisture of 250mm (Clay-loam + shallow-rooted crops) 39 Table 4.10 Computation of actual evapotranspiration for max. available soil moisture of 250mm(Clay-loam+ moderately deep-rooted crops). 39 Table 4.11 Computation of actual evapotranspiration for max. available soil moisture of 300mm (Clay + deep-rooted crops) 40 Table 4.12 Computation of actual evapotranspiration for max.
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