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.
Flash floods have a number of causes, but the primary one is when a very large amount of water is dumped suddenly in one region. This is usually the result of a storm cell. Flâ¦ash floods are common in parts of Australia where the drainage systems are not used to handling sudden deluges.