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Long-Term Statistics and Annual Characteristics of GRDC Timeseries Data (GRDC, 2017)

The Long-Term Statistics and Annual Characteristics offer basic hydrological statistics of timeseries data of the gauging stations being represented in the Global Runoff Database. Annual characteristics are derived from monthly discharge data, either aggregated daily data or originally provided monthly data. Long-term statistics and long-term variablity are derived from annual characteristics to:

  • Q-YVD - lowest, mean lowest, mean, mean highest, and highest daily discharge value in the individual calendar year, calculated from at least 10 monthly means in the year in question;
  • Q-YVM - lowest, mean, and highest monthly discharge value in the individual calendar year, calculated from at least 10 monthly means in the year in question;
  • Q-PVD - lowest, mean lowest, mean, mean highest, and highest daily discharge value in the given time series, calculated from yearly means, or the lowest and highest values of consecutive calendar years;
  • Q-PVM - lowest, mean, and highest monthly discharge value in the given time series, calculated from yearly means, or the lowest and highest values of consecutive calendar years;
  • Q-LTVD - lowest, mean, and highest daily discharge value in each calendar month in the given time series, calculated from monthly means, or the lowest and highest values in each calendar month in consecutive calendar years;
  • Q-LTVM - lowest, mean, and highest monthly discharge value in each calendar month in the given time series, calculated from monthly means, or the lowest and highest values of each calendar month in consecutive calendar years;

The annual characteristics, primary and long-term variability statistics are provided station by station as CSV-files, named with station number, parameter indicator (Q) and a statistics short name (YVD, YVM, PVD, PVM, LTVD, LTVM). For download, files are grouped by WMO Regions. Please note, that the annual characteristics and long-term statistics are only provided for stations with timeseries reflecting years of at least 10 months, and months of at least 20 days.

Please cite in your publication the GRDC as the source of the data: GRDC (2017): Long-Term Statistics and Annual Characteristics of GRDC Timeseries Data / Online provided by the Global Runoff Data Centre of WMO. Koblenz: Federal Institute of Hydrology (BfG), [Date of retrieval:YYYY-MM-DD].

WMO RegionCoverageNumber of stationsArchive
1Africa1543Download (0,7 MB)
2Asia1907Download (1,7 MB)
3South America741Download (1,3 MB)
4North & Central America2323Download (3,3 MB)
5Australia & Pacific552Download (0,2 MB)
6Europe & Mediterranean Asia2380Download (0,6 MB)
Total: 9446

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