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8.ÖÐÓ¢ÎĶÔÒë

Underground water

Of all the earth's water, 97% is found in the oceans, 2% in glaciers and only 1% on land. Of this 1% almost all (97%) is found beneath the surface and called sub-surface or underground water. Most of this water eventually finds its way back to the sea either by underground movement, or by rising into surface streams and lakes.These vast underground water deposits provide much needed moisture for dry areas and irrigated districts. Underground water acts in similar ways to surface water, also performing geomorphic work as an agent of gradation.Even though man has been aware of sub-surface water sinceearliest times, its nature, occurrence, movement and geomorphic significance have remained obscure. Recently, however, some answers have been found to the perplexing questions about underground water's relationship to the hydrological cycle. 1.Source of Underground Water

Since the days of Vitruvius at the time of Christ, many theories have been presented to explain the large volume of water underneath the earth's surface. One theory was that only the sea could provide such large quantities, the water moving underground from coastal areas. Vitruvius was the first to recognize that precipitation provided the main source of sub-surface water, although his explanations of the mechanics involved were not very scientific. His theory, now firmly established, is termed the infiltration theory, and states that underground water is the result of water seeping downwards from the surface, either directly from precipatation or indirectly from streams and lakes. This form of water is termed meteoric. A very small proportion of the total volume of sub-surface water is derived from other sources. Connate water is that which is trapped in sedimentary beds during their time of formation. Juvenile water is water added to the crust by diastrophic causes at a considerable depth, an example being volcanic water.

2 Distribution of Sub-surface Water

During precipitation water infiltrates into the ground. Under the influence of gravity, this water travels downwards through the minute pore spaces between the mit particles until it reaches a layer of impervious bedrock, through which it cannot penetrate. The excess moisture draining downwards then fills up all the pore spaces

between the soil particles, displacing the soil air. During times of excessive rainfall such saturated

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