Abstract
ABSTRACT THE influence of temporally varying flow rate and surface depth on measured infiltration, furrow roughness, and geometry were compared using classical and regionalized statistical theory. Flowing conditions, rather than stagnant water, enhanced intake on cracked Yolo clay loam whereas rapidly increasing surface flow depth enhanced infiltration on the same soil with fewer cracks. There is a significant cross-correlation between wetted perimeter and infiltration where cracks and holes do not dominate infiltration. The measurements were not correlated for distances of 8 m or more, however. Roughness decreased and the furrow geometry became more hydraulically efficient during irrigation. Displacement tests and cross-section measurements suggest that soil swelling may inflate estimates of deposition in furrows. Dewatering after the first surge in surge irrigation decreased deposition.
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