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Modeling of Water Subsurface Lateral Movement on Top of a Shallow Hardpan

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2007 ASAE Annual Meeting  072004.(doi:10.13031/2013.22925)
Authors:   Camilo Cornejo, Rao Mylavarapu, Subodh Acharya
Keywords:   Water table, hardpan, tracer, Bromide

The soil profile of Tri-county Agricultural Area (TCAA) located in Northeast Florida consists of an impermeable hardpan at about one meter depth, which restricts the vertical movement of water thus creating a perched water table during rainfall and/or irrigation events. Taking advantage of the shallow hardpan, the potato fields in the TCAA are irrigated with seepage irrigation system. Due to the nature of the system, some extent of subsurface lateral flow above the hardpan layer can be expected. This subsurface flow is of great environmental concern because it is responsible for increased nutrient and chemical loading in the Lower St. Johns River. Therefore, it is important to characterize this phenomenon so that new models of crop and nutrient management practices could be developed in the area.

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