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Problems of water resources management in Umuahia and environs, Imo state, Nigeria
5A 921030 Radon in the surface waters of southwest England and its bearing on uranium distribution, fault and fracture systems and human health Heath, M J Q J Engng Geol V24. N2, 1991, P183-189 Radon occurs naturally in the decay series of U and Th. The geochemistry of radon is outlined and analytical methods for its detection and measurement in gaseous, liquid, and solid phases described. Although in general the amount of radon generated is related to the quantities of radioactive elements present, its distribution in nature cannot be so simply interpreted. Uranium concentration, mineralogical effects, the transmission characteristics of the bedrock, carrier fluids and their flow, and weather and soil type all influence its distribution.
921034 Problems of water resources management in Umuahia and environs, Imo state, Nigeria Ezeigbo, H I; Okogbue, C O
Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 I"2, P1357-1362. Publ Rotterdam." A A Balkema, 1990 A study was conducted in lmo state, Nigeria, in order to establish the problems and improve the quantity and quality of water supply in the area. The study examined bacteriological quality, chemical quality of both surface and groundwaters, and borehole data and hydraulic parameters. Maintenance of boreholes and water draw controls have also been analysed. Remedial measures are discussed.
921031 Chemical reaction between concrete and natural groundwaters and its implications for the commissioning of observation boreholes in chalk Song Ling-Hua; Atkinson, T C Q J Engng Geol V24, N2, 1991, P221-229
921035 Groundwater flows in fissured and weathered platforms in the Ivory Coast (In French) Leblond, P Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V2, P1371-1378. Publ Rotterdam." A A Balkema, 1990
Waters taken from 4 purpose constructed observation boreholes in the chalk aquifer of Norfolk were found to have pH values in the range 8.5-11 and abnormal chemistry within 14 months of commissioning. The source of these anomalies was traced to contamination by alkaline porewater solutions from the concrete grout used in construction. The contamination was detectable after 3 years but can be cleared by pumping. A pumping test during commissioning of observation boreholes is recommended.
The hydraulic behaviour of fissured and weathered magmatic and metamorphic aquifers in a tropical climate has been examined by approaches including evaluation of productivity and estimate of recharge. Studies at an experimental pumping station have examined the relative contributions of fissured and weathered zones, the hydraulic functions of the fissures at various times of the year, supply and discharge of the aquifer, and the influence of base level fluctuations on the functioning of the fractured system.
921032 Legacy of aquifer pollution by industrial chemicals: technical appraisal and policy implications Lawrence, A R; Foster. S S D Q J Engng Geol 1"24. N2, 1991, P231-239
921036 Groundwater resource development in the Niger Delta: problems and prospects Ngah, S A Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V2, P1379-1386. Publ Rotterdam: A A Balkema, 1990
Casual or accidental discharge of industrial chemicals has polluted groundwater over many decades. Problems typical of chalk aquifer systems are addressed. Controls on contaminant migration in chalk are first examined. The mechanisms of contaminant entry and the hydrogeological properties of the Chalk aquifer are described. Case histories are presented of pollution of the Upper Chalk and Lower Chalk aquifers by chlorinated hydrocarbons. Liabilities for pollution, remedial measures, and future prevention are discussed.
921033 Preliminary studies of groundwater quality variations in Anambra state, Nigeria, and their possible relations to geology Ezeajugh, C L; Okogbue, C O Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V2, P1347-1355. Publ Rotterdam: A A Balkema, 1990 A study aimed at linking the ground water quality variations and geological and mineralogical variations in Anambra state is described. The study is based on isogram maps that can be used for mapping groundwater characteristics. By using statistical methods, the groundwater quality has been classified according to regions. The study has led to four underground water groupings based on cation concentrations, which can be linked to variations in underlying geology.
A study on the problems of groundwater resource development in the Niger delta has identified lack of planning both geologically and hydrologically and tack of technology as the main causes. These findings and a recent study commissioned by the government for controlling floods and erosion indicate prospects for the development of the area. However, political influences and land ownership laws still affect groundwater development efforts. Details of the study are presented.
921037 Yugoslav littoral belt karst springs used for water supply Pavlin, B Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V2, P1387-1394. Publ Rotterdam: A A Balkema, 1990 The hydrogeological conditions for the groundwater flow in the Yugoslav Adriatic coast and neighbouring islands are described. The protection of karst springs situated along the littoral belt against contamination from the seawater and past problems are discussed. Protective measures include artificially constructed grout curtains and rerouting of saline and fresh waters.
.© 1992 Pergamon Press plc. Reproduction not permitted
921034 Problems of water resources management in Umuahia and environs, Imo state, Nigeria Ezeigbo, H I; Okogbue, C O
Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 I"2, P1357-1362. Publ Rotterdam." A A Balkema, 1990 A study was conducted in lmo state, Nigeria, in order to establish the problems and improve the quantity and quality of water supply in the area. The study examined bacteriological quality, chemical quality of both surface and groundwaters, and borehole data and hydraulic parameters. Maintenance of boreholes and water draw controls have also been analysed. Remedial measures are discussed.
921031 Chemical reaction between concrete and natural groundwaters and its implications for the commissioning of observation boreholes in chalk Song Ling-Hua; Atkinson, T C Q J Engng Geol V24, N2, 1991, P221-229
921035 Groundwater flows in fissured and weathered platforms in the Ivory Coast (In French) Leblond, P Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V2, P1371-1378. Publ Rotterdam." A A Balkema, 1990
Waters taken from 4 purpose constructed observation boreholes in the chalk aquifer of Norfolk were found to have pH values in the range 8.5-11 and abnormal chemistry within 14 months of commissioning. The source of these anomalies was traced to contamination by alkaline porewater solutions from the concrete grout used in construction. The contamination was detectable after 3 years but can be cleared by pumping. A pumping test during commissioning of observation boreholes is recommended.
The hydraulic behaviour of fissured and weathered magmatic and metamorphic aquifers in a tropical climate has been examined by approaches including evaluation of productivity and estimate of recharge. Studies at an experimental pumping station have examined the relative contributions of fissured and weathered zones, the hydraulic functions of the fissures at various times of the year, supply and discharge of the aquifer, and the influence of base level fluctuations on the functioning of the fractured system.
921032 Legacy of aquifer pollution by industrial chemicals: technical appraisal and policy implications Lawrence, A R; Foster. S S D Q J Engng Geol 1"24. N2, 1991, P231-239
921036 Groundwater resource development in the Niger Delta: problems and prospects Ngah, S A Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V2, P1379-1386. Publ Rotterdam: A A Balkema, 1990
Casual or accidental discharge of industrial chemicals has polluted groundwater over many decades. Problems typical of chalk aquifer systems are addressed. Controls on contaminant migration in chalk are first examined. The mechanisms of contaminant entry and the hydrogeological properties of the Chalk aquifer are described. Case histories are presented of pollution of the Upper Chalk and Lower Chalk aquifers by chlorinated hydrocarbons. Liabilities for pollution, remedial measures, and future prevention are discussed.
921033 Preliminary studies of groundwater quality variations in Anambra state, Nigeria, and their possible relations to geology Ezeajugh, C L; Okogbue, C O Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V2, P1347-1355. Publ Rotterdam: A A Balkema, 1990 A study aimed at linking the ground water quality variations and geological and mineralogical variations in Anambra state is described. The study is based on isogram maps that can be used for mapping groundwater characteristics. By using statistical methods, the groundwater quality has been classified according to regions. The study has led to four underground water groupings based on cation concentrations, which can be linked to variations in underlying geology.
A study on the problems of groundwater resource development in the Niger delta has identified lack of planning both geologically and hydrologically and tack of technology as the main causes. These findings and a recent study commissioned by the government for controlling floods and erosion indicate prospects for the development of the area. However, political influences and land ownership laws still affect groundwater development efforts. Details of the study are presented.
921037 Yugoslav littoral belt karst springs used for water supply Pavlin, B Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V2, P1387-1394. Publ Rotterdam: A A Balkema, 1990 The hydrogeological conditions for the groundwater flow in the Yugoslav Adriatic coast and neighbouring islands are described. The protection of karst springs situated along the littoral belt against contamination from the seawater and past problems are discussed. Protective measures include artificially constructed grout curtains and rerouting of saline and fresh waters.
.© 1992 Pergamon Press plc. Reproduction not permitted