When completed, the height increase would add 117Mm3 of flood storage capacity to the Folsom reservoir, lowering the risk of a devastating flood in any given year to one in 213 - generally referred to as a 213-year flood.
When ongoing work on levees and new outlets on Folsom dam are completed, Sacramento would have roughly 140-year protection.
Although the construction of the proposed Auburn dam facility is considered a superior engineering solution to the mini-raise of the Folsom dam, its massive cost and opposition by environmental groups has deterred the construction of Auburn.
