Abstract

Frequency analysis is necessary to estimate the exceedance probability of flood flows or low flows. The return periods are calculated from these probabilities. In this chapter, a state-of-the-art computer program available for the Windows environment is described. The program can extract 7 or 30-day average low flows or r-maximum floods in a year, r ranging from 1 to 12, from Canadian Daily Streamflow Records. The frequency analysis can be carried out for various commonly used probability distribution functions. A brief description of an alternative flow analysis based on deriving a common form for all distributions is also described in this chapter. The result of this alternative analysis provides, in the case of flood flows for example, the expected value of the maximum flood for given lengths of time.

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