Using the exponential distribution as a synthetic curve volume of runoff to determine the volume of surface runoff

The paper analyzes the problem of determining the amount of surface wastewater that has formed on the territory of the drainage area as a result of precipitation and snowmelt, and enters the surface sewage disposal systems, for which the flow coefficient is used, which reflects the relationship between waterproofness and flow. Comparison of regression models used to estimate runoff coefficients showed a significant variation of its values ​​over the entire range of the total impervious area. For the samples of the generated values ​​of the total runoff coefficient with the corresponding proportion of waterproofness, statistical indicators were calculated and box diagrams were constructed. Regression equations of the total runoff coefficient from the share of the total impervious area with the corresponding soil filtration coefficient were obtained for the conditions of Kyiv, which more fully take into account the infiltration potential of the soil and the moisture level of the catchment before the rain starts.