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<br />80
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<br />CONGRESO GEOLOGICO INTERNACIONAL
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<br />003085
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<br />deplete the ground,water reservoir and reduce the amount of water available to
<br />man. Most phreatophytes are plants of low economic value, and so the water
<br />consumed by them is largely wasted, In the diagram, depletion of the reservoir
<br />is indicated by a reduction in volume through transpiration draft which- re-
<br />presents consumptive waste of water into the atmosphere. The water circulat-
<br />ing in this segment of the hydrologic cycle is potentially available for man's
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<br />,t WATER iREcrPJIATED.J. FRON.!, ATM1SPHf~C VA~OR J, WATER VAPOR RETURNED TO ATMOSPHERE
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<br />~J Interclptionb.Y! I
<br />~_brUSllandtrl'eS :r11,
<br />Over-land lEva..EOration I 1 II II I
<br />runoff - ____..J I
<br />Infiltration ,-+-___ ___ _ __ ~~f!!iIt]Qn_~___~ : : :
<br />Melt-water I r f
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<br />DePletion I. ~ - ~- -l Evapo~ation
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<br />PerCo!:tion of (Baseffow) 1
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<br />GROUND WATER
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<br />Fig. 2
<br />Fig. 2- The! hydrologic cycle fo-r an un.develO'ped closed basin in wn arid region.
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<br />use, and, by conserving the water through reducing the waste, he can make
<br />available for his use a pernnial supply equal to the reduction. In the arid regions
<br />of the United States, the water consumptively wasted by phreatophytes is con'
<br />sidered to be one of the largest sources of reclaimable water.
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<br />PHREATOPHYTES
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<br />.'.,.:...,..... > if:,,",;.": ';'"k,':.',::,:,\:';: :.' . .,...:. :. ........;:.\... ...:;!,'...;>i,;:".."....<' ,\..;\<:: ....:.'"
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<br />Phreatophytes do not belong to anyone genus or family of plants, but con'
<br />sist of many genera and include many species. They have only one common
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