Analysis of Rainfall Intensity Duration Frequency Curves for Zaria-Nigeria

Yusuf Abubakar Kusfa, M. M. Muhammad, S. A. Abdullahi, A. A. Kusfa

Abstract


Analysis of a design storm explained as the expected rainfall intensity for a given storm duration and return period was carried out to establish Rainfall Intensity Duration Frequency (IDF) relationships. The IDF relationships are essential for the designing of hydraulic structures for future planning and management. The intent was to determine IDF relationship for Zaria in Kaduna State. This region receives heavy rainfall and rain gauge stations are not so frequent. Under this condition, the engineers are bound to use IDF for the design of hydraulic facilities. Using the 24-hour annual maximum rainfall and disaggregated hourly maximum rainfall as a measure of rainfall intensity for each station, IDF curves of rainfall intensities of 30-minute to 24-hour durations were generated. Analysis was done using the Gumbel distribution functions. The IDF relationship developed can be used as valuable information for the planning and management of hydraulic structures in the region. 


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References


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