titre: Variabilité climatique et séchresse: cas du bassin versant de la tafna (nord ouest de l'algérie) Auteur : Adjim H ,Djedid A , Chettih M Résumé the catchement of tafna ( north-western of algria ) has seen its pluviometry seriously dropped these last years becouse of a drought wich settled in the area Mots clefs : catchement of tafna, pluviometry, rupture, drought source: