DETERMINATION OF TIME OF WATER RUNOFF FORMATION WHEN PRECIPITATION FALLS ON THE GROUND SURFACE

Abstract

The article is devoted to the current topic of designing drainage system for receiving and discharging water from ground catchment areas. The calculation is based on the parameter – the time of runoff formation when precipitation falls on ground surface. The value of this parameter depends on the intensity of precipitation on the ground surface, as well as on such parameters as the intensity of water absorption into ground. The existing dependence of determining the time of runoff formation gives contradictory results. When an increase in precipitation intensity and a decrease in absorption intensity the runoff time increases according to the existing relationship. The article deals with the issues of runoff formation on ground surfaces of airfields, determines the factors that affect the amount of runoff time. It is proposed to take into account the value of the critical water layer after exceeding which the runoff begins. A formula for determining the runoff time is proposed.