INTRODUCTION he project area is located within Anambra State, Southeastern Nigeria and lies within latitudes 5°560 1 and 6°40 1 N and longitude, 7°00 1 and 7°100 1 E, encompassing Aguata, Aniocha and Orumba Local Government Area. These areas hydrologically fallwithin the Anambra Basin and more specifically within the Anambra River Basin (Fig. 1). The area hasabundant surface water and groundwater resources. The main river systems in the study areas are Odo, Obizi, Otalulu, Iyiagu and Uchu. Geology and hydrogeology The Anambra basin is one of the major inland sedimentary basins in Nigeria, which is bounded on the east by the Abakaliki anticlinorium and on the southwesterly direction by the Benin hinge-line, the limits of the Eocene growth faults of the Niger Delta. These growth faults extend from the Calabar hinge-line to the T ABSTRACT Water quality (physico-chemical and biological) of the aquifers of the Tertiary formation of Igboukwu and environs was evaluated using the World Health Organization (WHO) and Nigeria Standard for Drinking Water Quality guidelines with water samples collected from twenty boreholes during pumping tests. The study area covers a total surface area of 450.56km 2 including towns like, Igboukwu, Ezinifite, Uga, Ekwulobia, Nanka, Oko, Aguluezechukwu, Umuchu, Achina, Ekwulumili and Ndiowu. Results showed that the area is underlain by two geological Units, Imo Shale and Nanka Sands, from which the aquifers were tapped. Analysis of the results of physical parameters showed that temperature is ambient, water is colourless, odourless and tasteless for all samples studied. Results of the water chemistry, however showed marked variations; pH values ranged from 5.20 at Ihuowelle Igboukwu to 6.80, at Ebele Achina (highest), total dissolved solids (TDS) from 11.20mg/l at Ezinifite to 71.40mg/ at Achina, turbidity nil, major cations and anions, calcium (Ca 2+) ranged from 5.0mg/l at Okwuchiezeada Ezinifite to 42mg/l at Ndiowu, magnesium (Mg 2+) ranged from 0.01mg/l at Uga to 0.18mg/l in Ekwulobia. Iron ion values ranged from 0.02mg/l to 0.35mg/l in Igboukwu, Umueze Uga (0.35mg/l), manganese, copper and residual chlorine were not detected; while Bicarbonate (HC03) ranged from 7.00mg/l at Ezinifite to 58.00mg/l at Uga and Sulphate (SO4 2) ranged from 0.00mg/l at Igboukwu to 7.00 mg/l at Ekwulobia, sulphate ions were not detected in Ekwoulobia, while in Umunze and Uga, Mn 2+, Ca 2+ and Clions were not detected either. Bacteriological results showed that total coliform and fecal coliform were zero. These results thus showed that the aquifers in the study areas contain portable water for domestic use if the wells are well constructed and harnessed.
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