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QUALITY ASSESSMENT OF STREAM WATER AND BED SEDIMENTS: A CASE STUDY OF URBANIZATION IMPACTS IN A DEVELOPING COUNTRY
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Paper number 701P0904, . (doi: 10.13031/2013.17380)
Authors: M. N. Tijani and S. Onodera
Keywords: Stream water, stream sediment, quality assessment, heavy/trace metals, contamination, urbanization impact, Ibadan, Nigeria.
Hydrogeochemical analyses and evaluation of surface water and stream-bed sediment samples from 40 different locations along the stretches of stream networks within Ibadan metropolis, SW Nigeria were undertaken with respect to the influence of urbanization and anthropogenic activities on the quality status of urban drainage system in a developing country. Results show that the surface water samples have generally low TDS with average value of 517mg/l, while average concentrations of the dominant ions are 75mg/l (Na) and 30mg/l (Ca) representing 51% and 18% respectively of the total cations and Cl (av. 86mg/l) and HCO3 (av. 71mg/l) representing 40% and 21% respectively of the total anions. However, indication of urbanization impacts on the surface water quality is revealed by the NO3 concentrations with values of 22.8 366mg/l, exceeding the WHO limit of 50mg/l in 85% of the sampled locations. The high NO3 as well as the variability of sodium and chloride concentrations are clear indications of contamination through a number of point-source inputs of domestic sewage, municipal effluents and waste dumps along the stretches of the drainage system in the study area.