Study of the variability of the hydrological regime of the diani river in the n’zerekore region in the republic of guinea

This present research aims to determine the hydrological parameters from average flows to define the variability of the hydrological regime of the Diani River watershed in N'Zérékoré in the Republic of Guinea. This research allowed us to understand the behavior of the flow in the river bed. During this research, after obtaining the average flow rates from the daily flow rates of the 27-year observation series (1995-2021), we determined; if the number of years of observation chosen is sufficient or not through the calculation of the mean square error whose calculated value is 14% which is in the interval of (10 to 15)%. From there, the rest of the results obtained during this study are as follows: the average interannual flow equal to 144.49 m3/s, the sum of average precipitation equal to 34184.6 mm/h, the coefficient of variability equal to 0 .44, the flow coefficient equal to 0.1, the minimum average flow rate is 26.48 m3/s and was observed in 2011 and the maximum average flow rate was observed in 2006 and is equal to 347.05 m3/s.