Abstract
The 30-yr return levels of annual maximum daily precipitation at AMeDAS stations were estimated by applying regional frequency analysis with L-moments to each prefecture (sub-prefecture in case of Hokkaido). The results show that those estimated return values are highly close to ones estimated by the usual method with SLSC and stability. Moreover, by the verification based on the idealistic non-exceedance probability of the 30-yr return levels, estimated 30-yr return values by regional frequency analysis are likely to be closer to the idealistic values, and the efficiency of this method was confirmed.
