Abstract
The technique applied in measuring streamflow with small portable weirs is described. In an experiment, two such weirs were placed in series in a stream. After a period of calibration, the riparian vegetation between the two weirs was removed. Vapour losses were reduced after treatment and an increase in streamflow was recorded. These changes were presumably caused by the treatment. The need to repeat this type of experiment before results can be considered reliable, is emphasised.

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