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Analysis of Water Flow from Cylindrical Macropores¹

ABSTRACT

Water flow from cylindrical macropores of finite length is predicted using an approximate analysis derived previously for flow from a steady constant-head uncased borehole permeameter in homogenous unsaturated soil. This analysis is appropriate in cases where the macropores fill rapidly and remain completely water filled. Under these conditions predicted macropore flow rates compared well to those obtained from measurements of flow into both "artificial" and natural macropores. The study emphasises the effect of pore continuity, with pore length exerting a dominant influence on the magnitude of macropore volume fluxes over the range of macropore diameters commonly encountered in agricultural soils.

¹ Contribution from CSIRO Australia.

² Research Scientist, Div. of Soils, Private Bag no. 2, Glen Osmond, SA 5064, Australia.

Received for publication November 29, 1985.

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