I am doing a research where I need to see how the wet(moist) unit weight of soil changes with increase of rainfall intensity. Or, is there any formula describing the relationship of infiltration and rainfall intensity.
The infiltration capacity of the soil depends on its texture and structure, as well as on the antecedent soil moisture content (previous rainfall or irrigation). The initial capacity (of a dry soil) is high but, as the storm continues, it decreases until it reaches a steady value termed as final infiltration rate.
The process of runoff generation continues as long as the rainfall intensity exceeds the actual infiltration capacity of the soil but it stops as soon as the rate of rainfall drops below the actual rate of infiltration.
The rainfall runoff process is well described in the literature. Numerous papers on the subject have been published and many computer simulation models have been developed. All these models, however, require detailed knowledge of a number of factors and initial boundary conditions in a catchment area which in most cases are not readily available.
Details may be referred from the FAO website- http://www.fao.org/docrep/U3160E/u3160e05.htm
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