Experimental Study of Rainfall-Runoff Process Through Calibrated Simulator; A Case Study of Auchi Polytechnic, Auchi, Edo State, Nigeria

Authors : Yahya OLOTU, Olawale O OLANREWAJU, Afolabi A RODIYA, Adesoji P ADEKUNLE

Pages : 250-258

View : 35 | Download : 9

Publication Date : 2022-07-04

Article Type : Research Paper

Abstract :The relationship between rainfall-runoff is a complex hydrological process that requires technical-based approaches to investigate and understand the interaction of the hydrological variables. A calibrated rainfall simulator was developed to produce storms at seven insert ignore into journalissuearticles values(7); predetermined rainfall intensities insert ignore into journalissuearticles values(RIs); over two insert ignore into journalissuearticles values(2); runoff plots insert ignore into journalissuearticles values(RPs);. The runoff plot insert ignore into journalissuearticles values(RP); is 0.72 m2 and RPB is 0.5 m2 was inserted 0.3 m into the bare sandy loam. The results of the experimentation showed the first rainfall simulation attempt insert ignore into journalissuearticles values(RSA); of RI of 10.8mm/hr was completely lost to infiltration from the two runoff catchment plots. Subsequently, the RSA generated surface runoff intensities insert ignore into journalissuearticles values(SRI); and RPB produced higher SRI and volume compared to catchment plots insert ignore into journalissuearticles values(RPA);. Conversely, the relationship of rainfall-runoff showed co-linearity between the simulated rainfall insert ignore into journalissuearticles values(SR); and generated surface flow RPA and RPB with the determinant of coefficients of 0.9926 and 0.9942 at P < 0.05. Therefore, the study’s finding is useful to develop a rainfall-runoff model under different runoff catchment areas for developing integrated water management schemes, hydraulic structures, and irrigation scheduling.
Keywords : Rainfall simulator, Rainfall runoff, Surface runoff intensities, Runoff plot, Hydrological process

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