Using the exponential distribution as a synthetic curve volume of runoff

Abstract

The paper analyzes the problem of determining the volume of runoff from the basin by means of runoff simulation methods using a one-parameter exponential distribution. Using the data of the hydrometeorological service on the maximum daily amount of precipitation of various types for some weather stations located throughout the territory of Ukraine, the dependencies of the probability distribution of daily precipitation layers were obtained, in the form of the total depth of precipitation and the total duration of precipitation. As a result of the approximation of the probability distribution of daily precipitation layers, the values of the frequency of events and the average value of the depth of daily precipitation layers for different regions of Ukraine and correlation coefficients were obtained. The use of the cumulative exponential distribution makes it possible to obtain a synthetic curve of the volume of runoff to determine the volume of annual surface runoff that is subject to treatment at treatment facilities.