Author(s):

Abhishek Ranjan and Ishika Singh

Abstract: Infiltration is one of the important variables in the hydraulics of irrigation. The design of an irrigation system depends to a large extent upon the infiltration characteristics of soil. Since the inception of research activities in the field of irrigation, scientists have been confronted with the problem of determining infiltration characteristics of the soil due to its temporal variation. The major factor affecting the infiltration rate of soil water are the initial moisture content, condition of soil surface, hydraulic conductivity of the soil profile, texture, porosity etc. Infiltration rate are also affected by the porosity of the soil which is changed by cultivation or compaction. It is observed that infiltration rate and accumulated infiltration for papaya grown field more than that for paddy harvested upland field. The average infiltration rate in paddy harvested field was found to be lesson, (4.09 cm/hr) than (6.35 cm/hr) in papaya grown filed. The average value of basic infiltration rate and the time to reach basic infiltration rate for papaya grown field were found to be (0.76 cm/hr) and (188 min) respectively. However it was observed to be (0.73 cm/hr) and (183 min) respectively for paddy harvested upland field. It was concluded that the Kostiakov equation yielded the lower value (4.36), RMSE (3.39) and MBE (2.20) for papaya grown and the lowest value of (3.82), RMSE (2.74) and MBE (2.13) paddy harvested field. Hence, the Kostiakov infiltration equation was found to be best suited for the area under study.

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