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The effect of the type of soil treatment on the flow of thaw-water from slopes



The effect of the type of soil treatment on the flow of thaw-water from slopes



Pochvovedenie (10): 36-49



A study was made of the effect of the direction and depth of the plowed furrows on the drainage of snow melt-waters from slopes which consist of loamy soils such as prevail in the territory of Zvenigorod section of the Moscow region. The study was located on 4 plots of 50 x 110 M and included a study of the snow coat and of the thaw-water drainage, the infiltration of the thaw-water into the soil, the freezing and thawing of the soil foundation, and of the meteorologic weather conditions. The observations extended over 1951-1953. In the fall, as the moisture of the atmosphere increased and the soil froze at the surface, the structureless loamy soils became practically impervious to the thaw-waters, and the down-slope water flow attained considerable proportions, the drainage coefficient being as high as 0.85-1.00. Plowing the slope soil to a depth of 20-25 cm with the furrow at a slight angle to the foot of the slope (0.02-0.03) reduced the flow of the thaw-water by 7-9% depending upon the weather conditions. Increasing the depth of the furrow from 20 to 30 cm and changing the direction of the furrow from the slightly slanted to one parallel to the base of the slope (perpendicular to the slope) reduced the downward flow of the thaw-water by 12-16%. These estimates vary somewhat with the degree of air moisture prevailing during off years. On slopes covered with clover three years old the thaw-water flow was reduced by 20-30%. Grass was even more effective in reducing the down-slope flow of thaw-waters, and its use for soil conservation purposes is recommended.

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