Sinkholes threaten Bonsall family's home after county stormwater dissolves underground pipes

Imagine nearly 50 basketballs rolling past your front door, per second, every second. That’s how many cubic feet of county stormwater flowed through underground pipes directly beneath the Stavinohas’ driveway. The Bonsall family said they had no idea those 30-in diameter underground pipes ran right through their front yard until it was impossible not to see them through gaping holes in their driveway.

The soil in San Diego County contains a lot of sand, which can’t withstand water erosion as well as other types of earth, Blum said, which is why, Blum said, the soil here is more vulnerable to landslides and sinkholes. Two county storm drains line the uphill road in front of the Stavinoha home. Developer maps obtained by NBC 7 Investigates show those storm drains direct water into a pipe system that runs under the driveway toward their home and then into another pipe which directs all that stormwater down a hill.

“It’s not even utilizing the pipe,” Kerry Stavinoha explained. “It’s just going straight toward our garage. I mean, massive flow. Like, I don’t think people understand when we had those big rains. It’s like Niagara sound coming through underneath the driveway.”After more than a year of that, the second pipe, the one designed to redirect water away from their home, gave out. Pictures of that one appear to show a pipe split in half.

Source: Real Estate Daily Report (realestatedailyreport.net)

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