Usually the flood frequency analysis uses the most significantly flood event in a year. In a statistical population of 100 years are exactly 100 flood events with different height or discharge. Each event isn't really a flood event. In a dry year the most significantly flood has an mean discharge.
Very often has a year two ore more sidnificantly flood events, but they were eliminated.
The idea is to count ALL flood-events, irrelevant the time when they occure. This might be have effect on the flood frequency with return periods between 2 and 10 years. This needs to determine a limit value and how to work with more than one peak during an event.
My question to peers is:
- what are the "official" or "innoficcial" regulations for flood frequency analysis in your country?
- is there any work which focusses these statistical problem?
Dear Steffen
This is a very involved question!
In the UK the Flood Studies Report (FSR) was published in 1975. This was the result of several years of research led by the Institute of Hydrology. The research team also included the UK Met Office, as well as the Irish Office of Public Works . It was the first attempt in the UK to “standardise” the approach to flood estimation. It allowed a number of research methods to be translated into practical tools and it became accepted by the UK practitioners and industry as the publication to use for estimating flood flows. The FSR covers five volumes and details methods to estimate design rainfalls for the UK and flood flows using both rainfall-runoff and pooling group methods. The flood frequency studies in the FST used around 5,500 station years from 430 UK gauging stations and 1,700 record years from 112 Irish sites. The unit hydrograph studies employed for the rainfall-runoff method used 1,500 rainfall-runoff events on 140 catchments. Post 1975 the FSR was updated via numerous supplementary reports . There is simply not enough space here to detail all the FSR and its supplementary reports cover. There is a paper by Max Beran entitled “The UK Flood Studies Report: Continuing responsibilities and research needs” see here https://rd.springer.com/chapter/10.1007%2F978-94-009-3957-8_3 which might be a good starting point, although I’m sure others can also advise. This is alos worth looking at: http://www.hydrology.org.uk/assets/BHS%20-%20UK%20flood%20hydrology%2040%20years%20after%20the%20FSR%20-%20Abstracts.pdf
Since 1999, in the UK, the Flood Estimation Handbook (FEH) procedures hav replaced the FSR and have been the adopted standard of practice by organisations responsible for flood frequency estimation for flood mapping, flood defences and spatial planning for new developments. The FEH includes statistical methods based on pooling groups and a revitalised rainfall-runoff method. Again there is simply not enough space to go into detail here. There are numerous papers and presentations on the FEH on the internet. The FEH is based on research undertaken by the Centre for Ecology and Hydrology (formerly the Institute of Hydrology who led the work on the FSR). There is an overview here: https://www.ceh.ac.uk/services/flood-estimation-handbook-web-service but I suggest you do some research on line to get a better appreciation of what is involved.
There is a paper here that compares flood frequency analysis methods in France see: www.mdpi.com/2076-3263/7/3/88/pdf
This paper by Castellarin et al. see https://www.researchgate.net/publication/279686364_Review_of_applied-statistical_methods_for_flood-frequency_analysis_in_Europe reviews statistical methods for flood-frequency analysis in Europe.
Hope that this is of help.
Darren
Dear Steffen,
Here I am attaching links of some of the important paper on flood frequency analysis, assumptions and applicability.
1. Flood frequency analysis: assumptions and alternatives
Article Flood Frequency Analysis: Assumptions and Alternatives
2. Flood frequency analysis: A review of 1979–1982
Article Flood frequency analysis: A review of 1979–1982
3. Frequency analysis of a sequence of dependent and/or non-stationary hydro-meteorological observations: A review
Article Frequency Analysis of a Sequence of Dependent and/or Non-Sta...
This may help you.
Best
Pankaj
it is more useful to decrease gape of knowledge relative to this ,so, please attached the document related with this?
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