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<br /> <br />003091 <br />86 <br /> <br />CONGRESO GEOLOGICO INTERNACIONAL <br /> <br />the western United States. These data, including iniormation On the volume <br />density and depth to the water table when known, are shown in table 1. <br /> <br />TABLE 1 <br /> <br />ANNUAL RATE OF WATER USE, INCLUDING PRECIPITATION, BY SOME OF THE <br />COMMON SPECIES OF PHREATOPHYTES IN THE WESTERN UNITED STATES <br /> <br /> Annual use Volume Depth to <br />Species ( acre.feet density water Locality and remarks <br /> per acre) (percent) (feet) <br />Alder 5.3 - - Santa Ana River <br /> drainage basin, Calif. <br />Alfalfa 2,6' - 3 Escalante Valley, Utah <br />do 3.71 - 4,5 Albuquerque, N. Mexico <br />Batamote 4,7 100 6 Safford Valley, Ariz. <br />Cottonwood 6,0 100 6 do <br />do 5,2 100 4 San Luis Rey River, Calif. <br />do 7.6 100 3 do <br />Mezquite 3,3 100 10 Safford Vane~ Arn. <br />Saltcedar 7,2 100 7 do <br />do 6.0 - - Pecos River, N. Mexico <br />Willow 4.41,2 - 2 Santa Ana, Calif. <br />do 2.5' - 1.1 Isleta, N. Mexico <br />Saltgrass ,8 to 4,0' - 0.5 to 5,0 See Fig. 3 . <br /> <br />1 For plants grown in tanks. <br />.2 Tank isolated, not in natural environment. <br /> <br />The role or phreatophytes in the water economy of arid regions stands out <br />sharply when expressed in terms of man's needs. For example, it was found <br />in the Safford Valley, Ariz" that the average use by a 3.year old cottouwood <br />three during the growing season was 10.3 gallons a day; in August, a month <br />of heavy use, it was 14,5 gallons a day, A single saltcedar plant of the same <br />age used 13.5 gallons a day for the season and 15,3 gallons a day during <br />August, <br />The average daily nse of water by each city dweller in the United States in <br />1950 was about 145 gallons, by each rural dweller having running water about <br />80 gallons, and by each rural dwller not having runing water about 10 gallons <br />