Regional flood frequency models have different assumptions regarding h
omogeneity and inter-site independence. Thus, uncertainty measures of
T-year event estimators are not directly comparable. However, having c
hosen a particular method, the reliability of the estimate should alwa
ys be stated, e.g. in terms of a standard error. For this reason, and
also for assistance in choice of method, approximate variances of the
T-year event estimate have been deduced for five different regional mo
dels.