Source: https://www.afdb.org/fileadmin/uploads/afdb/Documents/Project-and-Operations/Djibouti_-_Programme_national_d%E2%80%99approvisionnement_en_eau_potable_et_d%E2%80%99assainissement_en_milieu_rural_%C3%A0_l%E2%80%99horizon_2030_-_Etude_de_projet.pdf