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Infiltration Rates in Frozen Soils in Northern Minnesota¹

ABSTRACT

Infiltration tests were conducted in northern Minnesota forests and grassland using single-ring steel cylinders. Concretely frozen silt loam soils showed 0.09 inch of infiltration per hour, while sands of similar frost type showed 0.47 inch. A porous-concrete frost type was found in loamy sands; in these soils infiltration amounts were 2.19 inches for the porous-concrete frost, 3.97 inches in partly frozen soils, and 13.22 inches in unfrozen soils. The impermeable concrete type of frost was most prevalent in sod land, while in the forest the more permeable types were present.

¹ Contribution from Lake States Forest Exp. Sta., Forest Service, USDA. The Station is maintained at St. Paul 1, Minn., in cooperation with the University of Minnesota.

² Senior Soil Scientist, and Chief, Division of Watershed Management, respectively.

Received for publication May 6, 1959. Accepted for publication October 12, 1959.