Conversion of 15-Minutes to 1-Minute Rainfall Distribution Derived from Tropical Rainfall Distribution Measurement

Abstract The radiocommunication sector of the International Telecommunication Union (ITU R) necessitates a 1-min integration time of rainfall rate to predict attenuation at terrestrial links and earth-space links. Since time series of rainfall that satisfies this requirement is not common, the conversion into corresponding 1-min distribution is suggested as an alternative of time series with longer integration time, T (e.g., 10-,30-,60-minutes). This research reviews existing methods for the conversion of cumulative distributions of rainfall and compares the said conversion methods. Several approaches are utilized to convert the 15-minutes rainfall rate to a 1-min rainfall rate in the tropical area of Kampung Paya Jaras. It found that Segal’s method performs the best conversion procedure overall.