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Introduction

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

Citation:   No Citation available.
Authors:   Ray, Chittaranjan
Keywords:   Ground water, Pesticides, Domestic wells

A simple hydrologic cycle interfacing the land, atmosphere, and ocean is shown in Figure 1.1. Evaporated ocean water condenses in the atmosphere and falls as precipitation on the land surface. The portion of the precipitation that infiltrates through the land surface can either be lost to the atmosphere via evapotranspiration or be transported downward under the influence of gravity, becoming deep percolate. The deep percolate eventually becomes ground water that finds its way to the subsurface aquifer system. In humid areas a portion of the ground water from aquifers is discharged to rivers, lakes, or wetlands, whereas in arid areas ground water in general does not discharge to surface-water bodies. Ground water is partially recharged due to leakage from surface sources. The hydrologic cycle exemplifies the natural processes of ground water.

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