B. Karami ¹, M. Golabi ², K.N. Dhumal ³

Affiliations
1 University of Pune, IN
2 Khuzestan Water and Power Authority Company, Ahvaz, IR
3 Department of Environmental Sciences, University of Pune, IN

Abstract

Infiltration equations differ in the parameters they require and in how they predict approximate infiltration rate curves. Irrigation and drainage projects require precise knowledge of soil infiltration parameters, which can be determined using four techniques: double ring, level basin-furrow, inflow outflow, and volume-balance. By applying double ring data, was calculated the rate of infiltration at Shavoor plain in south-western Iran and obtained coefficients of infiltration equations (Green-Ampt, Philip, Kostiakov, Kostiakov-Lewis, SCS and Horton). The results show that the Kostiakov- Lewis, Kostiakov, and Philip equations produced more accurate results than other equations. In the study area, the coefficients of the Green-Ampt equation are more than 10 and 1 (A>10 and B>1). Further, the results of the Philip equation show S>0.5 and A>0.001, and in the Kostiakov equation, n and k are greater than 0.5. What is most significant is that the k in Kostiakov's equation is approximately equivalent to the value of S in Philip's equation. Therefore, k is dependent on the physical characteristic of the soil.

Keywords

Infiltration, Coefficients of Infiltration Equation, Double Ring

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