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  Information - HS51 Intercomparison of Rainfall Intensity Gauges (co-listed in AS & CL)

Event Information
The WMO Joint Expert Team on Surface-Based Instrument Intercomparison and Calibration Methods and the International Organizing Committee on Surface-Based Instrument Intercomparison started in September 2004 the WMO Laboratory Intercomparison of Rainfall Intensity (RI) Gauges. The Intercomparison was held at the recognized laboratories of the Royal Netherlands Meteorological Institute (KNMI), the Netherlands, Météo France, France, and the University of Genoa, Italy.
The main objective of the laboratory intercomparison was to test the performances of catchment type rainfall intensity gauges of different measuring principles under documented conditions. Further objectives can be summarized as follows:
To define a standardized procedure for laboratory calibration of catchment type rain gauges, including uncertainty of laboratory testing devices within the range from 2 to 2000 mm/h;
To evaluate the performance of the instruments under test;
To comment on the need to proceed with a field intercomparison of catchment type of rainfall intensity gauges;
To identify and recommend the most suitable method and equipment for reference purposes within the field intercomparison of catching and non-catching types of gauges;
To provide information on different measurement systems relevant to improving the homogeneity of rainfall time series with special consideration given to high rainfall intensities.
Only catchment type of instruments that are currently being used in national observing networks or are being considered for use in national networks and are capable of measuring rainfall intensity of at least 200 mm/h at a time resolution of 1 minute were tested. Nineteen (19) types of instruments have been selected, with usually 2 instruments of the same type, produced by 18 different manufacturers. Fifteen countries were represented; out of them 10 from Europe and five non-European countries. All instruments were tested in each laboratory.
This session aims at providing a forum for open discussion on the main objectives of the Intercomparison, the adopted methods, and expected/obtained results, also with a view at the foreseen Field Intercomparison of Rainfall Intensity Gauges in Various Climatic Regions to be possibly started in early summer 2006.
Contributions are invited (from the institutions participating in the Intercomparison, but especially from other researchers) dealing with errors and uncertainties due to the limited performances of rain measurement instruments, error assessment and correction procedures, and to the effects of error propagation on to hydrological models and rainfall statistics, for both investigation and design purposes.

Preliminary List of Solicited Speakers


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