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City releases after-action summary following intense storm that flooded Sycamore/Park Terrace area
Summary
City staff described an unusually intense rain event and identified communication gaps, inlet/utility coordination and a temporary pump-station failure as primary causes of the December flooding; staff pledged infrastructure, outreach and notification improvements and a neighborhood meeting to collect resident input.
City staff presented an after-action summary of a December storm that flooded parts of the Sycamore and Park Terrace neighborhoods, telling the council the event combined an unusually intense short-duration rainfall, blocked storm inlets and a partial pump-station outage that together produced the scale of damage residents reported.
City Manager Todd Cusimano introduced the report and framed it as a starting point for neighborhood engagement: “This after action report is the starting piece,” he said, adding that the city planned meetings to put faces to names and improve neighborhood-level response and communications.
What happened: Staff said a short, intense period of rain — more than three inches in roughly three hours — exceeded forecasted intensity and overwhelmed local drainage inlets. The city’s Sycamore pump station briefly operated at reduced capacity after two of three pumps tripped and remained offline until technicians could restore proper amperage; staff said a corrective electrical change has since been implemented.
Root causes and lessons: The report identified three primary factors that combined to worsen flooding: (1) a week-earlier water-main incident that left heavy mud and debris in local drain lines; (2) inlet protection and debris that prevented normal flow; and (3) a pump-station electrical issue that temporarily reduced pumping capacity. Staff said earlier coordination with the Marin Municipal Water District (MMWD) and more proactive inlet clearing during storm forecasts could have reduced the worst impacts.
Resident accounts and concerns: Several residents who suffered vehicle and property damage addressed the council. Tom Redmond, whose house and vehicles were affected, said bluntly, “I had no notice that night,” and described multiple vehicles rendered inoperable. Another resident, John Lehi, said he tracks creek gauges and asked the city to clarify what residents should expect and who to contact during storm events.
Communication and technology: Council and staff discussed notification platforms and protocols. The chief of police and staff advised using Alert Marin for life-safety messages and Nixle for lower-priority traffic or localized notices; staff acknowledged a missed opportunity to send an Alert Marin message that night. The report said the city will push registration to Alert Marin, work with the county Office of Emergency Management and standardize which platform is used for different threat levels.
Infrastructure and planning follow-up: Staff noted the city’s prior drainage and flood studies, including a 2021 drainage master plan and the capital projects identified through Measure L and Flood Zone 3 funding. The after-action report recommends accelerating inlet clearing in forecasted events, improving coordination with utilities (MMWD), confirming pump-station electrical capacity and pursuing capital upgrades identified in the city’s drainage master plan.
Next steps: Staff will convene neighborhood meetings to collect residents’ accounts, confirm localized fixes and present a timetable for capital improvements and outreach steps. The manager told the council the city had corrected the pump-station electrical issue and will continue to pursue grant and Measure L-funded projects for larger drainage improvements.
Why it matters: Council members and residents said the city’s response and notification timing are central to preventing avoidable damage in future storms. Council members requested regular updates on Alert Marin registration and a neighborhood-level timeline for proposed infrastructure work.
