For example, \(y=\frac{4}{x-2}\): Note that as the graph approaches x=2 from the left, the curve drops rapidly towards negative infinity. This is because the numerator is staying at 4, and the denominator is getting close to 0. That means that the fraction itself is getting very big and negative.
Causes of flooding. A flood occurs when a river bursts its banks and the water spills onto the floodplain. Flooding tends to be caused by heavy rain: the faster the rainwater reaches the river channel [river channel: The part of the river that holds the water. ] , the more likely it is to flood.
Floods are one of the most common hazards on Earth and have claimed millions of lives in the past 100 years. Flooding can be triggered by heavy rainfall, tsunami events, high astronomical tides, snow melt, ice jams, prolonged strong onshore winds, or a failure of dams/levees to trigger.