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500 years Hydrograph at downstream of highly regulated catchment

500 years Hydrograph at downstream of highly regulated catchment

500 years Hydrograph at downstream of highly regulated catchment

What is the best approach for producing a hydrograph with 100 and 500 year return period for a highly regulated catchment? I have a gauging station with 50 years data at the downstream of the catchment . The max flood in this period has just 40 year return period. I don’t want to use a rainfall run off model because I do not have enough information about the reservoirs within the catchment. Is it possible to build 100 and 500 years hydrographs from available time series? . The only method which I have found in text books is unit hydrograph method which is very simple and I am sure it is not enough accurate for this study. Any idea?

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