Assessment of Use of At-site and Regional Flood Data for Flood Frequency Estimation

摘要: The Standard error of flood quantiles estimated by three different methods were obtained simulation. based on (a) at-site, (b) at-site and regional data combined (c) alone. Data generated from GEV distributions. Since method involves a regression relation an element physical realism was preserved basing the generating distributions those real rivers in S. E. England using corresponding catchment characteristic values relations. set included 17 sites 20 years one site variable record length n=1, 3, 6, 10 years. Three (low, medium, high Cv) investigated separately. at-site/regional is considerably better than either or especially at return periods. For large T(c) can be if n small. In general, mean annual less precise \(\overline {\text{Q}} \) year record.