Abstract
ABSTRACT The Rainfall Erosion Index (EI) is one of the primary factors in the Universal Soil Loss Equation. Calculation of EI is based on breakpoint rainfall records where breakpoints separate periods of constant rainfall intensity. Breakpoint data are determined from continuously recording, chart-type raingage records. This article examines the use of rainfall records for EI determination where accumulated depth is recorded at fixed time increments. Various time (1, 2, 3, 5, 6, 10, 15, 30, and 60 min) and depth (0.25, 0.5, 0.75, 1.0, 2.0, 3.0, 4.0, and 5.0 mm) resolutions were superimposed on breakpoint rainfall records from Tifton, GA to obtain equivalent non-breakpoint records. Results of statistical analyses relating non-breakpoint EI values to breakpoint EI values are presented, along with correction factors for adjusting non-breakpoint EI to breakpoint EI and a relationship defining optimum time and depth resolution combinations for accurate EI calculation. KEYWORDS. Rainfall, Erosion, Runoff.
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