People turn to Google for accurate and helpful information during crises to help them protect themselves and their families. Floods are the most common type of natural disaster and nearly 1.5 billion people, or some 19 percent of the world population, are directly exposed to substantial risks from severe flood events worldwide. Flooding also exacts an immense material toll, causing around $50 billion in annual global economic damages.For most of history, accurate flood forecasting at scale was n...