Yahaya Olotu, O. O. Olanrewaju, A. A. Rodiya and P. A. Adekunle
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 (7) predetermined Rainfall Intensities (RIs) over two (2) Runoff Plots (RP). The Runoff Plot (RPA) is 0.72 m2 and RPB is 0.5 m2 was each inserted 0.3 m into the bare sandy loam. The results of the experimentation showed the first Rainfall Simulation Attempt (RSA) of RI value of 10.8 mm/hr was totally lost to infiltration without generation of surface runoff from the two runoff catchment plots. Subsequently, the RSA generated varying Surface Runoff Intensities (SRI) and with RPB producing higher SRI and volume compared to large catchment plots (RPA). Conversely, the relationship of rainfall-runoff showed co-linearity between the simulated rainfall 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 constructing Integrated Water Management Schemes (IWMS), hydraulic structures, and irrigation scheduling.
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