Shānhóng bàofā yǐhòu, fùjìn de jǐ ge cūnzi dōu bèi chōnghuǐ le.
After the flash flood broke out, several nearby villages were washed away.
Tips
mistakes
The usual verb is 暴发 'to break out suddenly', written with 暴 'violent': 山洪暴发. The 爆发 with 爆 'to explode' is for volcanoes and wars. Both are read bàofā.