Frequency of flooding
In your homework exercise you will see how flood frequency can be determine for any given stream if data is available for discharge of the stream over an extended period of time Such data allows statistical analysis to determine how often a given discharge or stage of a river is expected From this analysis a recurrence interval can be determined and a probability calculated for the likelihood of a given discharge in the stream for any year.The data needed to perform this analysis are the yearly maximum discharge of a stream from one gaging station over a long enough period of time