title: Geographical information system (GIS) mapping of spatio-temporal pollution status of rivers in Ibadan, Nigeria.
abstract: More accurate spatio-temporal predictions of urban environment are needed as a basis for assessing exposures as a part of environmental studies and to inform urban protection policy and management. In this study, an information system was developed to manage the physico-chemical pollution information of Ibadan river system, Oyo State, Southwest Nigeria. The study took into account the seasonal influences of point and non-point discharges on the levels of physico-chemical parameters. The overall sensitivity of the watershed to physicochemical environmental pollution revealed that during dry season, of the 22 (100%) sample points, only 3 (13.6%) were unpolluted; 6 (27.3%) were slightly polluted; 10(45.4%) were moderately polluted; 2 (9.1%) were seriously polluted and 1 (4.5%) was exceptionally polluted. During rainy season, 3 (13.6%) were unpolluted; 7 (31.8%) were slightly polluted; 9 (40.9%) were moderately polluted; 2 (9.1%) were seriously polluted and 1 (4.5%) was exceptionally polluted. There is a considerable environmental risk associated with the present level of pollution of the Ibadan river water body on fish health and biodiversity. This research provides a basis for aquatic management and assist in policy making at national and international levels. Appropriate strategies for the control of point and non-point pollution sources, amendments and enforcement of legislation should be developed.
authors.affiliation: Department of Veterinary Public Health and Preventive Medicine, University of Ibadan, Ibadan, Nigeria.
authors.forename: Olanike K
authors.initials: OK
authors.lastname: Adeyemo
authors.forename: Olutayo O
authors.initials: OO
authors.lastname: Babalobi
mesh_terms: D002947:Cities; D004784:Environmental Monitoring; D004787:Environmental Pollution / Q000032:analysis*; D040362:Geographic Information Systems; D005843:Geography; D009549:Nigeria; D011891:Rain; D045483:Rivers / Q000737:chemistry*; D012621:Seasons; D014876:Water Pollution / Q000032:analysis*