Frequency Analyses

Extreme hydrologic events such as droughts and floods cause significant damage in both developing and developed countries.  Frequency analyses are conducted to fit data to a probability distribution in order to determine the likelihood of events of specific magnitudes and durations.  The fitted distributions are used to inform policy, planning, and design in water resources management.  However, data availability is an issue, particularly in developing countries.  When a lack of data or only short data records are available, regional frequency analyses can be substituted, in which data from sites with similar characteristics to the site of interest are assessed.  A recent approach to regional frequency analyses known as L-moments has been applied through activities at two G-Wadi Centers: (1) The International Center for Integrated Water Resources Management (ICIWaRM) and (2) Water Center for Arid and Semi-Arid Zones in Latin America and the Caribbean(CAZALAC).

ICI-RAFT (ICIWaRM)

GWADI
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LAC Drought Atlas (CAZALAC)


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