What happened in January 2019
An atmospheric river in January 2019 brought a National Weather Service flash flood watch to Orange County, with street flooding expected. Sandbags were made available at Orange County Fire Authority stations and most city public works yards.
- Garage doors and low patios
- Slopes and drainage swales
- Attached garages with lower floors
Storm water that drops from a leaking roof is handled on the roof leak water damage page.
Creeks and the watershed
More than 70 percent of the Aliso Creek watershed is urbanized, and that pavement sends more runoff into the creek during storms. Wood Canyon Creek is the one tributary that still resembles its natural condition.
Orange County tells residents to look up a property on the FEMA Map Service Center to see its flood zone. The Aliso Viejo Community Association maintains most slopes, medians and parks, so drainage issues on association land go to them.
Garages and ground-floor rooms take the brunt because water follows the grade toward them. Sandbags, door sweeps and clear drains reduce the water that gets in, but nothing replaces drying what did. The drying stage that follows is explained under structural drying.