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Saisir sur l'écran tactile la longueur d'onde associée à la gamme mesurée : -420 nm pour la gamme basse (0 ? 150 mg) -620 nm pour les gammes intermédiaire, pp.0-750 ,
0 -150 mg), c'est le pourcentage de transmittance qui doit être relevé. Sur l'écran, à droite, il y a la possibilité de passer en mesure de transmittance en appuyant sur l'inscription %T ,
mauvaise répartition des pluies provoquent des migrations de plus en plus fortes des populations principalement du Nord et du centre vers les villes ,
avec le Sahel et se transforme graduellement en savane lorsqu'on va vers le sud. On y trouve même des forêts (région de Bobo-Dioulasso et Banfora ainsi que vers Gaoua et les frontières ivoiro-ghanéennes) ,
Une situation qui s'explique en partie par la faiblesse des ressources naturelles, et de celles des prix de ces ressources naturelles sur le marché mondial, l'aridité des sols et l'absence de leur mise en valeur durant la période coloniale, et la démographie. L'agriculture représente 32% du produit intérieur brut et occupe 80% de la population active. Il s'agit principalement d'élevage mais également ,
dont le pays est le premier producteur en Afrique avec 700 000 tonnes en 2006 principalement tournées vers l'exportation, l'économie résiste tant bien que mal à la chute des cours mondiaux ,
eau annuelle moyenne des précipitations est de 748 millimètres, soit pour une superficie de 274 000 kilomètres carrés, un volume de précipitations annuelles de 205 km³ ,
qui comprend l'ensemble des ressources créées en interne, plus les apports extérieurs éventuels) est de 12,5 km³ par an, soit pour une population de quelques 15 millions d'habitants, un peu plus de 800 m³ par habitant et par an; ce qui peut être considéré comme faible mais actuellement suffisant ,
le Burkina Faso a un réseau hydrographique assez important, surtout dans sa partie méridionale. Les cours d'eau se rattachent à trois bassins principaux : les bassins de la Volta ,
Les industries sont plus concentrées dans les trois premières villes. Ouagadougou regorge de nombreuses industries et des centres communautaires qui rejettent des effluents, Nous allons davantage nous intéresser à la pollution par les eaux usées dans la ville de Ouagadougou ,
Ouagadougou est estimée à 30 250 hectares, elle s'inscrit dans le schéma directeur de l'aménagement de la ville et de son extension ,
zone soudano-sahélienne, marquée par une pluviométrie moyenne de 750 mm d'eau recueillie par an. La saison pluvieuse s'étend de mai à octobre, soit une période de 6 (six) mois. La température moyenne est d'environ 30°C avec une température ,