What catastrophic event would have the biggest impact on a watershed?

question 10 options:

tornado

flood

forest fire

earthquake

Flood is the catastrophic event would have the BIGGEST impact on a watershed

Explanation:

Sometimes, the water may enter the watersheds very quickly for the land to absorb it. These results in flooding.  

The consequences may be quick melting of winter snows, tropical storms and events of precipitation. When the river flow is forecasted in an accurate way, it can save many human's life and dollars in millions. The conditions of the watersheds and its association with the rest of the water cycle are the factors that are considered by the Hydrologists for this forecasting.

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.