The No-Rise Surprise
Why Additional Conveyance Area Doesn’t Always Lower Water Surface
Last Friday, Condit Dam, on the White Salmon River was intentionally breached by blowing a hole in the spillway as part of a plan to remove the dam and restore the river to its natural state. Although the actual breaching of the dam was not all that spectacular (i.e. the dam itself wasn’t destroyed-only a relatively small hole was blown through the base of the spillway), the drawdown and subsequent erosion of the reservoir was very interesting. It was all captured in “time-lapse” in a video posted at the following location:
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