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.
Nature and Causes of Floods. and Associated Secondary. Hazards. Throughout history people have been attracted to the. fertile land of the flood plains where there lives have. been made easier by virtue of close proximity to sources. of food and water. Flood Hazard. Ironically, the same river or stream that provides. sustenance to the surrounding population also renders. these populations vulnerable to disaster by periodic. flooding.