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Caption: This chart shows annual rainfall totals recorded at the Petaluma Cooley raingage (DWR gage # E20 6826 40) between 1978 and 2000. This raingage is located within the Lower San Antonio Creek Calwater planning watershed in the Petaluma River sub-basin. An extended dry period occurred between 1987 through 1992; preceded and followed by oscillating wet and dry years. The reported rainfall data are point measurements and do not represent the spatial variations existing throughout the entire Calwater planning watershed or the San Antonio Creek sub-basin. See Info Links for more information.
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