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.
Fluvial (River) Flooding Fluvial flooding occurs when rivers burst their banks as a result of sustained or intense rainfall. The image below shows fluvial flood risk for Dublin, created using our Flowrouteâ¢ flood modelling software. Fluvial Flooding Impact: Cornwall. Flowrouteâ¢ is used to predict the depth, duration, velocity and extent of flooding and is highly accurate. The images below compare fluvial flood risk modelled for Lostwithiel in Cornwall against aerial photography of an actual flooding event at that location in 2010. Coastal Flooding. Coastal flooding is caused by extreme tidal conditions including high tides, storm surges and tsunamis.