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A multi-agency analysis of the fire damage in 2018 found that properties located within fire burn areas may still be at risk for flash floods, mudflows and debris flows.Photo by Charles Kitchen from FreeImages
A multi-agency analysis of the fire damage in 2018 found that properties located within fire burn areas may still be at risk for flash floods, mudflows and debris flows.Photo by Charles Kitchen from FreeImages

Continued Risk of Flooding and Mud
Debris Flows from 2017 Wildfires

Local agencies and property owners
must prepare for the rainy season 

Sep 27, 2019

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The City of Santa Rosa and the County of Sonoma continue to encourage residents living in and around the areas burned by the Sonoma Complex Fires to prepare their property for the rainy season and remain alert for possible threats from intense winter storms. Properties in the areas burned, and downstream of those areas, still have an elevated risk for flash floods, rock falls, debris flows, and mudflows.

The areas affected by the Nuns, Tubbs, and Pocket Fires did not experience any significant debris or mudflows over the last two winters. While these areas have seen substantial improvement in soil and plant growth conditions, the threat of natural hazards from winter storms still exist. The highest danger occurs during intense or prolonged heavy rainfall, but once soils are saturated, floods or mud and debris flows can occur hours or days after the rain has stopped. Property owners in burned areas, and downstream of burned areas, can help prepare themselves and prevent erosion and water quality impacts, by following these steps:

1. Take Precautions for your Family

•  Check the Post-Fire Hazard Map for an estimate of the risk in your vicinity. Localized or changing conditions may result in a greater threat than displayed on the map. 

•  Pack emergency supply bags and identify what you’d want to save in an emergency. Consider the 6 P’s: People and Pets, Important Papers, Prescriptions, Pictures, Personal Computers, and Plastic/Paper money. 

•  Create an evacuation plan and include two possible evacuation routes.

2. Prepare your Property

•  Use erosion control techniques, such as installing straw wattles and rock bags, and remove excess debris near creeks, storm drains and drainageways on your property.

•  For additional erosion prevention information, visit sonomacountyrecovers.org/rain-ready.  For questions, if your property is in the City of Santa Rosa, call 707-543-4649. In the unincorporated County, call 707-565-6186.

3. Remain Alert

Know how you’ll receive alerts:

•  Wireless Emergency Alerts: Always keep your phone on, with the ringer on, to receive alerts from the National Weather Service.

•  SoCoAlert: Sign up to receive emergency notifications at SoCoAlert.com. SoCoAlert will be used to send an emergency notification if there is an imminent threat to life or property.

•  In areas with limited cell service, or in areas that may experience power outages, have a battery powered weather emergency radio on hand to receive critical messages from the National Weather Service. 

 The City and County are working in close coordination to prevent and monitor flooding. A series of rain and stream flow gauges were installed within and downstream of the burn areas by Sonoma Water as part of an early warning system for flooding. The gauges allow monitoring of streams and rainfall in real-time and offer a glimpse of conditions in the burn areas and downstream of areas that are vulnerable to flooding. Data from the gauges is used by the National Weather Service to develop its hazardous weather advisories, alerts, and warnings. This real-time rainfall and streamflow data is available atsonoma.onerain.com.

To assist property owners in the burn areas with managing storm water runoff, the City and the County have developed best management practices for the installation of erosion control measures at vacant lots and construction sites. These practices are designed to reduce erosion and the amount of sediment that washes off sites during rain storms - potentially causing pollution in creeks and blockage of drainageways. The City and County are conducting site visits at locations in the burn areas to ensure erosion control measures are properly installed and maintained. 

For more information, visit sonomacountyrecovers.org/rain-ready.

Call: Sonoma County Recovers Information Line (707) 565-1222 between 8:00 a.m. and 5:00 p.m., Monday – Friday.

Email: info@sonomacountyrecovers.org

Visit: County Administrator’s Office located at 575 Administration Drive Suite 104A.

Debris Removal Right-of-Entry Processing Center

Call: (707) 565-6700 between Monday-Friday, 7:30 am to 4:30 pm

Visit: 625 5th Street, Santa Rosa, between Riley and Humboldt

Sonoma County Recovers

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