Abstract
The soil plays an important part in the hydrologic cycle that is little appreciated. It is the purpose of this unit to show how the soil fits into some aspects of the soil-plant-atmospheric system. A simplified form of the hydrologic cycle can be written as
where P is precipitation as rain or snow, I is irrigation, Et is evapotranspiration (soil evaporation, Es, and plant transpiration, Tr), Ro is runoff or runon, Dep is depletion of soil water storage, and Dr is drainage. As written, Eq. [1.1] has the inputs of water to the soil reservoir on the left-hand side of the equation and the outputs or storage on the right hand-side. Over long periods of time, for example a yearly cycle, the storage term may be negligible. Some examples of the components of Eq. [1.1] are shown in Table 1.1 for several locations in the U.S.A. Note that runon (-Ro) or upward flow (-Dr) would be inputs not outputs.
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© 1992 Springer-Verlag New York, Inc.
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Hanks, R.J. (1992). Water Quantities. In: Applied Soil Physics. Advanced Series in Agricultural Sciences, vol 8. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-2938-4_1
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