The Bay Area’s vast network of rain and stream gauges, linked to computers, offer early warning of rising waters.
A stream gauge is a humble thing.
Katie Leonard, of Pleasant Hill, left, assists Scott Mathers, of Pleasant Hill, as they rescue Mathers’ mother Patsy Costello, 88, of Pleasant Hill, after being trapped in her vehicle for over an hour on Astrid Drive in Pleasant Hill, Calif., on Saturday, Dec. 31, 2022. Costello drove her car on the flooded street thinking she could make it when it stalled in the two feet of water. After two hours the water had receded about a foot making it easier to rescue her.
The gauges can provide days or hours of advance notice, giving residents time to sandbag, move cars, help the homeless, lift electronics and precious antiques off the floor — or seek higher ground. Looking ahead at long-range weather forecasts, Xu said, “We see: ‘Is it a wet pattern? Is it a dry pattern?’ When you see back-to-back storms, you know you have to plan resources and think, operationally, about how you’re going to move water, if you need to.”
Crews on the ground assess a creek’s condition, looking for debris and other risks. This effort is intensified if winds are forecast.
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