The existing drainage systems in Polesia have exhausted their resource and need reconstruction and modernization to improve the overall technological, economic and environmental efficiency of their operation.To study the influence of the main factors of variation of the distance between the drains methods of statistical modeling and the probability theory are used, which developed a mathematical model for determining standard deviation determining factor of the investigated function. According to the results of the studies, it was found that the drainage flow module characterizing the intensity of soil and territory drainage is formed mainly due to the values of the drainage speed, filtration coefficient and the time of excess water drainage and has a significant impact on the distance between the drains, which is 86-98 %. Based on the simulation for the conditions of Ukrainian Polesia dynamics and the average weighted modules in drainage outflow under different weather and climatic conditions for growing different crops on different soils, the considerable variability of their values in time and space are obtained, the normalized curves constructed security module drainage outflow for the main arable crops on mineral and peat soils. The obtained results convincingly show that both current and average values of the drainage flow modulus in the studied conditions have a pronounced variability in climatic conditions, the type of crops grown and the type of soil. With its value for the selected key factors the drainage system substantially differs primarily from the maximum current values and values during the vegetation period calculated from accepted values by more than a few times, what determines the need to take account of this designing reconstruction projects, construction and operation of such facilities.

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