Abstract
Sediment yield from a small test field with the area of 5200m2in a typically semi-arid region of the north-east of Brazil has been observed for several rainfall events in 1987 and 1988. And the sediment yield is proved to increase remarkably when the total rainfall depth in a continuous rainfall event exceeds 10mm. Sediment yield is directly connected with runoff discharge and is about 5% of the total runoff, and it is well estimated with a runoff-erosion process modeling for rainfall events of the total depth more than 10mm.
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