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Water Movement into Soil from I dealized Vertical Mulch Channels¹

ABSTRACT

A mathematical solution in elliptic integrals is obtained for the flow in a system of channels in water-saturated, uniform soil, assuming a very highly permeable stratum to exist at finite depth. If water enters the soil through the original soil surface as well as the channel surfaces, the increase in flow due to the channels is generally small. However, if the original soil surface is sealed, the channels are relatively effective in restoring the flow to that which occurs in the absence of the channels and surface sealing. From the analysis there emerges the simple depthspacing formula, d₀ = 0.28 S, which is presented as a tentative design criterion for the placement of vertical mulch channels.

Analysis is also made for soil anisotropy in which the horizontal permeability exceeds the vertical permeability. In all cases this increases the flow contributions of the channels.

¹ Journal Paper No. 1504, Purdue University Agr. Exp. Sta., Lafayette, Ind. Contribution from the Department of Agronomy. Presented before Div. I, Soil Science Society of America, Aug. 6, 1958, at Lafayette, Ind.

² Associate Professor of Soils.

Received for publication October 16, 1959. Accepted for publication February 8, 1960.