Not always, but if it is due to a storm, they do their best, and if it is because of a busted dam, they usually have predicted scenarios so they know where to evacuate... it just depends on how fast the flooding happens.
Yes, you can predict a flood
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The magnitude of a flood refers to the size and severity of the event, usually measured by the volume of water, flow rate, or the extent of the affected area. It is an important indicator of the impact and potential damage caused by the flood.
Why do forecasters try to predict flood heights at different points along a river? - they do this to issue warnings fast.
they read the reports that they reported in the past.
By observing the stars.
gamgam style
they are caused by earthquakes and the scientist measure the earthquake magnitude and the predict.
Using records of flood patterns to predict future flooding.
In ancient Egypt their astronomers use the stars to predict when the Nile River would flood.
They needed to predict when the Nile river would flood
They needed to predict when the Nile river would flood