Engineering | Science | Technology on Instagram: "A flash flood happens when a huge amount of water suddenly rushes into an area faster than the ground, rivers, or drainage systems can handle — often within minutes to a few hours. Here’s how it forms: When intense rain falls over a short time, the soil can’t absorb it. The water stays on the surface and starts flowing downhill. In cities, this is even worse because roads, concrete, and buildings don’t absorb water at all, so everything runs stra