Abstract
The present study aims to delimit protection perimeters around the “Agbo” river in Agboville in order to reduce the risks of pollution of this water resource. The methodological approach consisted first all in assessing the vulnerability of the resource and then in determining the protection perimeters based on the vulnerability map and previous studies. Five parameters (slope, land use, soil type, annual runoff and drainage density) were used. These parameters were then weighted using the Saaty multicriteria analysis method. The vulnerability map reveals four classes (very low, low, medium and high) with a dominance of the low class (41.35% of the area). Three protection perimeters were delineated (immediate, close and remote). The immediate protection perimeter is delimited at a distance of 200 m around the SODECI water intake on the “Agbo” river and covers the areas with a strong influence on the vulnerability to pollution of the river. The closer protection perimeter at a distance of 1000 m, is represented by the zones with strong influence on the vulnerability of the resource and the direction of water flow in the watershed. Finally, the remote protection perimeter covers a large part of the catchment area with a surface area of 510.36 km2 and takes into account the zones that have an influence on the vulnerability to pollution of the resource. These delimited protection perimeters can serve as a guide for the management and protection of the water intake in Agboville as well as for land use planning in this area.
Highlights
In several regions of the world, water resources, mostly surface water, are increasingly threatened by pollution
The present study aims to delimit protection perimeters around the “Agbo” river in Agboville in order to reduce the risks of pollution of this water resource
In Côte d’Ivoire, most of the cities located on the crystalline basement have surface water as main source of drinking water supply [2]; this is the case of the city of Agboville
Summary
In several regions of the world, water resources (surface and groundwater), mostly surface water, are increasingly threatened by pollution. One of the causes of the degradation of the quality of these surface waters would be related to the increasing amount of polluting discharges into the receiving environments without prior treatment [1]. They point out that land use related to agricultural, urban and industrial activities has contributed, over the last few decades, to increasing the potential for surface water contamination and, in some cases, to increasing the risk of contamination. This threat is reflected in its high load of organic and mineral matter, so that the current treatments of the Water Distribution Company in Côte d’Ivoire (WDCCI) are no longer able to purify the water properly [3]
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