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The malfunction of sewerage systems and rain water drainage networks is perceived as a very crucial problem by authorities in Côte d'Ivoire, both from an environmental point of view as well as the associated maintenance costs. This paper discusses the state of the sewerage systems, the malfunctions and environmental concepts used to categorize the problems, and the methodological options to prioritize the various management solutions. This review also presents the selection of decision support tools for sewerage asset management. The tools were classified according to their capability and functionality. The working principle of each of these tools was described and the corresponding data requirements were determined. Moreover, the paper discussed the problems associated with the use of existing tools and presents a perspective on future research needs in the field of decision support tools. This paper represents a comprehensive review of the sewage systems management challenges and can serve as a reference document for other developing countries in Sub-Saharan Africa.

In Cote d'Ivoire, the failure of urban sewage systems is a crucial problem for the drainage of wastewater and rainwater. This failure is due to many factors and therefore, calls for diagnostic studies. The present study aimed at analyzing these networks in order to identify the different factors that contribute to the operational and structural degradation in selected sewerage and drainage networks in Abidjan, Cote d'Ivoire. The method used in the study involved semi-structured interviews, video camera inspection and socio-environmental field surveys (geographical survey and household survey), followed by descriptive statistics. The results revealed that many structural, environmental and behavioral practice contribute to the progressive degradation of urban sewage systems. These factors are essentially those that prevent the normal flow of wastewater in the pipes such as the illegal dumping of solid waste, the unauthorized connection of wastewater networks, unsustainable urban agricultural practices, as well as the high concentration of vegetation on both sides of the network and the dilapidated infrastructure of the wastewater and rainwater networks. It was found that these factors are at the origin of the clogging and degradation of the sewers since 85% of the residents used these sewers as a dumping ground for solid waste.