Abstract

Standard storage rain gauges preserve nothing of the magnitude of individual rainfall events. A low-technology modified storage gauge is described which records event magnitudes but not their timing. A float in the gauge contains a collimated radioactive source which has its intensity calibrated so that each rainless period generates a line on a protected film. Rainfall event magnitudes are recorded as the vertical intervals between consecutive horizontal lines on the film. That is, the record represents a stratigraphic column of rainfall events at the gauge location. A network of the gauges allows significant rainfall event “layers” to be linked through space analogous to stratigraphic correlation.

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