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<br />003'397
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<br />CONGRESO GEOLOGICO INTERNACIONAL
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<br />the record of silting in the reservoi-r. In the 21.5 years before a dense growth
<br />of saltcedar developed on th", delta above it, some 41,000 acre,feet of silt was
<br />deposited in the reservoir, whereas in the 25 years since the dense growth
<br />deve loped only about 9,800 acre.feet of silt was deposited.
<br />The desilting effect of the salcedar growth suggests the possibility of 'using
<br />these plants as a desilting agent to. prolong the life of reservoirs, The cost, ho.
<br />wever, in terms of water may be quite high. The average streamflow depletion
<br />by about 12,000 acres of ,a!tcedars in the McMmillan de!ta from 1934 to 1940
<br />was estimated to be 54,200 acre.feet a year (National Resources. Planning
<br />Board, 1942, p. 56), or more than 20 perC<jllt of the streamflow entering the
<br />area of sa!tcedar growth.
<br />
<br />BIBLIOGRAPHY
<br />
<br />BLANEY, H. F., C. A. TAYLOR, H. G. NICKLE and A. A. YOUNG, 1933. Water
<br />losses under natural conditions from wet areas in southern California.
<br />Calif. Dept. Public Works, Div. Water Resources Bull., 33.
<br />GATEWOOD J. 5., T, W. ROBINSON, B. R. COLBY, J. D. HEM and L, C. HALPENNY,
<br />150 Use of water by bottom-land vegetation in lower Safford Valley, Arizona.
<br />U, S, Geol. Survey, Water,Supply Paper 1103.
<br />MACKICHAN, K. A. 1951. Estimated use of water in the United States. 1950,
<br />U. S. Geol. Surv., Cire. 115.
<br />MEINZER, O. E. 1923. Outline of ground-water hydrology, with definitions.
<br />U. S. Geol. Surv., Water.Supply Paper 494.
<br />- 1927. Plants as indicators of ground water, U. S. Geol, Surv., Water.
<br />Supply Paper 577.
<br />MUCKEL, D. C. and H. F. BLANEY, 1945. Utilization of the waters of lower Sian
<br />Luis Rey Valley, San Diego County, Calif. U. S. Dept. Agriculture Pubis.
<br />NATIONAL RESOURCES PLANNING BOARD. 1942. Regional Planning, Part X.
<br />ROBINSON, T. W. 1952, Phreatophytes and their relation to water in western
<br />United States. Trans, American Geophys, Union, 33(1).
<br />. THOMAS, If, E. 1952. Hydrologic reconnaissance of the Green River in Utah
<br />and Colorado. U. S. Ceol. Surv., Cire, 129.
<br />WHITE, W. N. 1932, A method for estimating ground-water supplies based on
<br />discharge by plants and evaporation from soil. U. S, Geol, Surv., Water-
<br />Supply Paper 659-A,
<br />YOUNG, A. A. and If. F. BLANEY, 1942. Use of water by native vegetation.
<br />Calif. Dept. Public Works, Div, Water Resources BuY. 50.
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