Global Journal of Researches in Engineering, J: General Engineering, Volume 1 9 Issue 2

Estimation of Rainfall Erosivity Index for Auchi, Edo State, Using Lombardi’s Method By Ajayi A. S., Ehiomogue P., Kayong A. E. & Duweni E. C. University of Agriculture Abstract- The erosivity factor in the universal soil loss equation (USLE) provides an effective means of evaluating the erosivity power of rainfall. This study evaluated the erosivity factor based on monthly and annual precipitation rainfall data of Auchi, Edo State covering a period of 2005 – 2014 using Lombardi method (EI =1.03V d 1.51 ). It was discovered that higher rainfall values resulted in high erosivity index values which was in line with other tropical climates. The average annual erosivity index for the city during the period of study was 587.32 MJ mm/hr. The R 2 of 0.651 shows that precipitation alone contributed 65.1% of the erosion risk within the study period. The knowledge of impact of rainfall on erosivity is essential in soil erosion risk assessment and for soil and water conservation planning. Keywords: erosivity, kinetic energy, erosion, rainfall intensity, lombardi, erodibility, auchi, soil loss. FOR Code: 291899 EstimationofRainfallErosivityIndexforAuchiEdoStateUsingLombardisMethod Strictly as per the compliance and regulations of: Volume 19 Issue 2 Version 1.0 Year 2019 Online ISSN: 2249-4596 & Print ISSN: 0975-5861 Global Journal of Researches in Engineering: J General Engineering Type: Double Blind Peer Reviewed International Research Journal Publisher: Global Journals GJRE-J Classification: © 2019. Ajayi A. S., Ehiomogue P., Kayong A. E. & Duweni E. C. This is a research/review paper, distributed under the terms of the Creative Commons Attribution-Noncommercial 3.0 Unported License http://creativecommons.org/licenses/by-nc/3.0/ ), permitting all non commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.