10.25750/1995-4301-2018-1-033-042Yalaletdinova A. V. Enikeеva L. V. Vozhdayеva M. Yu. Kantor E. A. Statistical characteristics of relationships between turbidity and water flow rate caused by releases of the water reservoirTheoretical and Applied Ecology2018water reservoirwater flow rateturbiditydensity of distributionprobability of distributionquantiles of distributionruDataset1The temporal variability of water flow rate and turbidity in the Ufa River was estimated. To describe the changes in turbidity and water flow in adverse periods (like floods), such statistic characteristics as distribution density of water flow rate and turbidity and probability of occurrence of adverse events related to deterioration of water quality were found. It is determined that the tail portions of the distributions of the probabilities of water flow rate and turbidity are shifted toward larger values of the investigated parameters. It is detected that when the water flow rate exceeds 450 m3 /s, it contributes to an unstable state in the Ufa River. The distribution density of water flow is well described by a power-law dependence ρ1 (Q) = 98048Q-2.72 at a 84% coefficient of determination. Turbidity values exceeding 10 mg/dm3 conform to the unstable state of the river. Power-law approximation of the turbidity’s density of distribution ρ2 (М) = 43.3М-2.22 has a 93% coefficient of determination. It was established that the occurrence probability of adverse events with high water flow rate values is 80–93%. The occurrence probability of adverse events when turbidity has high values is 75–88%. It is determined that the increase in water flow rate during flood periods leads to an increase in turbidity. However, turbidity does not depend on water flow rate if its value is less than 450 m3 /s. Assessment of the relationship between the turbidity and the water flow rate in the Ufa River gave possibility to derive an equation which allows calculating the turbidity values in the flood period when flow rates exceed 450 m3 /s.