According to this news story from KHQ in Colfax WA, the owner of a Honda Accord could not get the car to stop and enlisted the flood control channel to do the job.

Brake failure sends car plunging into flood control channel in Colfax

The Whitman County Sheriff’s Office says a brake failure sent a car into a 15-foot deep concrete flood control channel in Colfax just before noon on Saturday. 

Deputies say the 1990 Honda Accord was heading west on Canyon Street down a hill when the brakes failed. The driver, 20-year-old Tyler Davis of Sandpoint, Idaho could not get the car to stop and went through the intersection of Main and Canyon Street. 

Read more at KHQ.com