Description
The objective of this document is to assist engineers and hydrologists in developing extreme flood estimates for major water resources engineering works and projects for the Government of the Province of Alberta. The aim is to promote a relatively uniform approach to developing estimates of the Probable Maximum Flood (PMF) and other hypothetical floods of very low probability for purposes of project design or evaluation, and to improve the consistency of estimates. In the present context, an extreme flood is viewed as an event resulting from very unusual rainfall or snowmelt or both together, that in statistical terms is likely to have a return period of 500 years or more and whose reliable estimation is beyond the capacity of conventional flood frequency analysis.