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Mill Valley to issue after‑action report on Sycamore flooding after pump station failure, communication lapses
Summary
City Manager reported that debris from a prior water‑main break and two pumps tripping offline at the Sycamore Pump Station contributed to unexpected flooding during a major storm; staff said neighborhood notifications and Alert Marin procedures will be reviewed and an after‑action report will be shared with neighbors.
City Manager (name not specified in the record) told the Mill Valley City Council that a combination of debris from a prior water‑main break and a partial pump‑station failure caused an unexpectedly rapid flood in the Sycamore neighborhood during a major storm in late December.
The manager said the Sycamore Pump Station has three pumps, two of which tripped offline during the storm and could not be restarted until about 6 a.m. That failure, combined with what the manager described as roughly seven inches of rain on local hillsides and about 1.5 inches on the flats during a nine‑hour period, led to flooding that officials said was faster and more intense than anticipated.
“We think some of the debris from the water main break the week before was a contributing…
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