Determination of Rainfall Temporal Pattern in Heavy Storms of Khorasan Provinces

Time distribution relations,havebeen developed forheavy storms on area raining and presented in probability terms to provide quantitive information on interstorm variability and to provide average and extrem ralations for various applications of the findings. It was found that the relations could be repreasented basd by relating percentof storm rainfall to percent of totalstorm time andgrouping the data recording to the quartile in which rainfall was heaviest. The individual effectsof mean rainfall, stnnduration, and other storm factors weze smallanderratic in behavior when theforegoing analytical techniqewasused. Basinarea had asmallbutconsistenteffect upon the time distribution. The derived relations are applicable to the north-east of Iran (Khorasan province) and other areas of similarclimate and topography- They can be used in conjunction with published information on spatial distributions and other storm parametersto construct storm models for hydrologic applications.

Keywords:

Rainfall temporal patterns , Hydrology , Storms