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.
1 Storm surges that are caused by a tropical or extratropical cyclone are included in this category of floods. 2  Coastal floods are caused by severe sea storms, or at the hands of another hazard such as a tsunami or a hurricane.3  Storm surges, as mentioned before, are also included in coastal floods. Coastal floods are caused by severe sea storms, or at the hands of another hazard such as a tsunami or a hurricane. 2  Storm surges, as mentioned before, are also included in coastal floods.