Purpose. Soil moisture is very important for plant productivity, as well amount of fertilize depends on the soil moisture. Drainage is the tool for productive farming in the wet fields, but drainage accelerates leaching biogenus from the soil, so, it is very important the right management of drainage discharge. Drainage discharge depends not only of the temperature, precipitation, but also of the amount of humus in the soil. Methods. Field experiments, data comparison, generalization and evaluation by statistical analyses. Results. The results of daily temperature, precipitation and drainage discharge in the object with different hummus thickness layers (bold - up to 40‑50 cm - thick and natural – 20‑30 cm - layer) on 2018‑2020 are presented. The weather was drought (about 15% less as Climatic Normals), and hot (the temperature was about 1,8^oC above Climatic Normals) the last 3 years in the Kaunas, Lithuania. The drainage system was working quite short period of investigation time, mainly during winter and early spring only. Conclusions. In case of thickened humus layer annual drainage discharge was higher compare with drainage discharge with natural humus layer.