Maximum daily rainfall, Hail region, Saudi Arabia

The importance of this study is reflected in estimates of rainfall intensity suitable for rainstorms for the return periods from 5 to 100 years, based on the daily maximum rainfall data recorded during 1970-2011 at Uqlat Ben Jabrin station (H208), 1971-1999 at the Nuqra station (U212) ) , 1976-2011 at Al-Ghazala station (H215) and 1960-2016 at Hail station (H001).
This study presents an analysis of the daily maximum rainfall variation and the intensity of precipitation derived from it during the studied period at each station. The coefficient of variation showed that the maximum daily rainfall of Hail station is more regular and that similar of Nuqra station is the most volatile.
Two probability distribution models, (Normal probability distribution and the Extreme value  -type 1- probability distribution, have been applied in estimating the maximum daily rainfall amounts for periods of return from 5 to 100 years.
               The estimates of daily maximum rainfall showed that the difference between the estimates of the two models ranged from 1.0% in 10 years return period to 29.3% in the Nuqra station, 39.8% in Uqlat ben Jabrin station, 41.4% in Hail station and 38.9% in Al-Ghazala station.