الفهرس 
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Abstract
Summary
The main aim of this research is to investigate the use of rainfall estimates from the Tropical Rainfall Measurement Mission (TRMM) satellite in order to use the TRMM ratios to develop IDF relationships in arid regions when no sub-daily rainfall information is available.
Rainfall ground data were collected from forty three rainfall gauges with short duration records in the study area, which is the Kingdom of Saudi Arabia (KSA). TRMM data were also collected for the same ground stations locations, for comparison purposes, and also covering the entire KSA, for generalization purposes. Frequency analyses were undertaken on the ground stations and TRMM data using several distributions and the best fitting was selected. The study area was subdivided into zones to obtain robust and reliable relationships. Regression equations were developed for each zone to predict 3-hr to 24-hr ratios and predictions were extended to cover the entire study area for locations where short duration ratios were not available. These predicted ratios along with the SCS type II storm profiles were used to derive rainfall depth ratios for all storm durations. These ratios should be multiplied by the 24-hr rainfall depths at different return periods to obtain the depth-duration-frequency and hence the IDF curves.