Developing and Mapping Rainfall Intensity, Duration, and Frequency Curves in Al-Faria Catchment

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Haji, Hussein Fathi Hussein
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An-Najah National University
Rainfall intensity duration frequency (IDF) relationship is one of the most ordinarily used tools in water resources engineering, mainly to identify rainfall intensity at a duration and return period. In light of this, the present study is aimed at developing rainfall IDF relationship for Al-Faria catchment. The ground surface elevation in the catchment varies significantly. With a mild rainy winters and moderately dry, hot summers, the climate in Al-Faria catchment is Mediterranean, semi-arid region. Al-Faria catchment is gauged by six rainfall stations; these stations are Nablus, Talluza, Tammun, Tubas, Beit Dajan and Al-Faria with approximately 48 year of data. The analysis of the extreme values of annual rainfall data was achieved. The results proved that Gumbel distribution fits the data and can be used for future estimations. After all available data was assessed and completed the IDF curves were developed for stations, maps for the catchment were developed from these curves using inverse distance weight (IDW) as an interpolation tool through ArcGIS. These maps can be used to find rainfall intensity which also could be found directly (without using curves or maps) using the program that was created by Matlab. ArcGIS gives an IDF map for a certain period and duration while using Matlab will allow displaying an IDF curve for any point, any return period and duration.