OUVRAGES DE CAPTAGE DEAU ET PERIMETRES DE PROTECTION: CAS DES NOUVEAUX CHAMPS CAPTANTS DE DJIBI ET DE NIANGON NORD II A ABIDJAN (COTE DIVOIRE)
Authors:   Universite Felix Houphouet Boigny, Abidjan, UFR des Sciences de la Terre et des Ressources Minieres (STRM), Laboratoire des Sciences du Sol, de lEau et des Geomateriaux (LSSEG)., Anowa Evrade Larissa EBA , Serge Kouakou DEH ,   Universite Felix Houphouet Boigny, Abidjan, UFR des Sciences de la Terre et des Ressources Minieres (STRM), Laboratoire des Sciences du Sol, de lEau et des Geomateriaux (LSSEG)., Gabriel Etienne AKE ,   Universite Felix Houphouet Boigny, Abidjan, UFR des Sciences de la Terre et des Ressources Minieres (STRM), Laboratoire des Sciences du Sol, de lEau et des Geomateriaux (LSSEG)., Eugene KONAN ,   Universite Felix Houphouet Boigny, Abidjan, UFR des Sciences de la Terre et des Ressources Minieres (STRM), Laboratoire des Sciences du Sol, de lEau et des Geomateriaux (LSSEG)., Rene BALLIET ,   Universite Felix Houphouet Boigny, Abidjan, UFR des Sciences de la Terre et des Ressources Minieres (STRM), Laboratoire des Sciences du Sol, de lEau et des Geomateriaux (LSSEG)., Kan Jean KOUAME ,   Universite Felix Houphouet Boigny, Abidjan, UFR des Sciences de la Terre et des Ressources Minieres (STRM), Laboratoire des Sciences du Sol, de lEau et des Geomateriaux (LSSEG).,   Universite Felix Houphouet Boigny, Abidjan, UFR des Sciences de la Terre et des Ressources Minieres (STRM), Centre Universitaire de Recherche et dApplication en Teledetection (CURAT)., Jean Patrice JOURDA ,   Universite Felix Houphouet Boigny, Abidjan, UFR des Sciences de la Terre et des Ressources Minieres (STRM), Laboratoire des Sciences du Sol, de lEau et des Geomateriaux (LSSEG).,   Universite Felix Houphouet Boigny, Abidjan, UFR des Sciences de la Terre et des Ressources Minieres (STRM), Centre Universitaire de Recherche et dApplication en Teledetection (CURAT).
Published: December 2022

To strengthen the drinking water supply capacity of Abidjan city, the State has built water catchment structures in the communes of Cocody-Angre and Yopougon-Niangon Northern-2. However, in the proximity of these structures, there are several human activities that constitute major sources of pollution. It is therefore necessary to implement a strategy to protect this resource. Thus, this study aims to determine the close (PPR) and distant (PPE) protection perimeters around these catchment structures. The analytical methods of Krijgsman and Lobo-ferreira and Wyssling were used to determine the protection perimeters. For the PPR, the values obtained with the Krijgsman and Lobo-Ferreira method vary from 118 to 155 m for the upstream radius and 42 to 79 m for downstream radius. While those obtained with Wyssling vary from 107 to 144 m for upstream radius, and 50 to 87m for downstream radius. At the level of the PPE, the results vary from 1,128 to 1,721 m for upstream radius and 47 to 109 m for downstream radius according to the Krijgsman and Lobo-Ferreira method. Those calculated with the Wyssling method varying from 4,084 to 4,199 m for upstream radius and 93 to 207 m for downstream radius. Concerning the radius perpendicular to the flow direction at the borehole, it varies from 74 to 112 m for PPR and PPE with Krijgsmans and Lobo-Ferreiras methods. While Wysslings method gives 74 to 112 m for the PPR and 615 to 933 m for the PPE respectively. The Wyssling method therefore better evaluates the radii of the protection perimeters of Abidjan groundwater catchment structures.