Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2011.512.519BiT.A. GoulaFadikaV.SoroG.E.32011113The annual rainfall series of Tabou remained stationary over the period 1922-2004 with the application of the segmentation test. However, a decrease of 10% over the 1990s is noted. The 1993-98 deficit sequence which is at the origin of this decline seamless stationarity is characterized by observations of average deficits of 30, 31 and 44% of the months of heavy rainfall in May, June and November. Also for the months of December, January and March of the long dry season with rainfall amounts recorded decreases of 36, 44 and 38% compared to the period 1922-1992. Estimates of monthly rainfall in Tabou over the period 2000-2002 with the usual stations are less effective than those conducted by kriging and inverse distance which improve on average 26-122% in the month and, thanks to increased density in rainfall stations. The introduction of these estimates obtained by spatial interpolation instead of rainfall depths known in proportions of 19, 39 and 58% as the input data is supported by the model GR2M in calibration and validation phases. Unlike those from the arithmetic mean that cause decreases in 9-21% of the coefficients of Nash which amplified in validation from 9 to 48% depending on the size of their proportions in the rain input.]]>Andreassian, V., C. Perrin, C. Michel, I. Usart-Sanchez and J. Lavabre,2001Ardoin, S.,2004Assani, A.A.,1999Anctil, F., N. Lauzon, V. Andreassian, L. Oudin and C. Perrin,2006Aubreville, A.,1949Baillargeon, S.,2005Bigot, S., Y.T. Brou , V. Bonnardot and E. Servat,2002Bigot, S., Y.T. Brou, J. Oszwald and A. Diedhiou,2005Bell, V.A. and R.J. Moore,2000Bourqui, M.,2008Eldin, M.,1971Duncan, M.R., B. Austin, F. Fabry and G.L. Austin,1993Fadika, V., B.T.A. Goula, F.W. Kouassi, I. Doumouya and K. Koffi et al.,2008Fontaine, B., S. Janicot and P. Roucou,1999Goula, B.T.A., F.W. Kouassi, V. Fadika, K.E. Kouakou and G.B. Kouadio et al.,2009Houdenou, C. and K. Hernandez,1998Hubert, P., E. Servat , J.E. Paturel, B. Kouame , H. Bendjoudi, J.P. Carbonel and H. Lubes-Niel,1998Janicot, S., A. Harzallah, B. Fontaine and V. Moron,1998Kouadio, Y., D.A. Ochou and J. Servain,2002Le Barbe, L., T. Lebel and D. Tapsoba,2002Lay, M.L. and S. Galle,2005Lebel, T., A. Diedhiou and H. Laurent,2003L`Hote, Y., G. Mahe, B. Some and J.P. Triboulet,2002Moron, V.,1996Mouelhi, S., C. Michel, C. Perrin and V. Andreassian,2006Oudin, L., C. Perrin, T. Mathevet, V. Andreassian and C. Michel,2006Paturel, J.E., I. Boubacar and A. L'Aour,2004Paturel, J.E., E. Servat, B. Kouame, H. Lubes and J.M. Masson et al.,1997Refsgaard, J.C., W.M. Alley and V.S. Vuglinsky,1989Robinson, M.,2005Savane, I., K.M. Coulibaly and P. Gioan,2001Scheffe, H.,1959Servat, E., J.E. Paturel, H. Lubes-Niel, B. Kouame, J.M. Masson, M. Travaglio and B. Marieu,1999Sultan, B. and S. Janicot,2004Tapsoba, D., B. Bobee, L. Lebarbe and E. Elguero,2002Troutman, B.M.,1983