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<br />1.
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<br />Determine the geographic extent' of 'phteatophyte "areas,
<br />their composition ilndchanges;in vegetation cover. The
<br />present maps are being revised. Aerial photographs and
<br />old'vegetiltion surveys ofs~lected areas are being
<br />assembled.
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<br />2,
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<br />Determine the costs of water salvage'l'iy eradication or
<br />control of phreatophytes. Review,the legal s,tatu6 by states
<br />of water so developed.
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<br />3,
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<br />Development of methods for physically evaluating salvage
<br />resulting from eradication or control of nonbenef,ibia:!',
<br />phreatophytes under different conditions of (a) climate,
<br />(b) depth to the water table, (c) cO'l/'er densi,ty (i.e.
<br />volume of foliage), and (d) 'quali ty Of the ground wa ter.
<br />Asa corollary to' this and' 'a'side:from' the 'water benefits,
<br />forecasts' of the possible beneficial' or harmful effects
<br />that could' result from the treatment, 'such as streambank
<br />and wind erosion; increase or decrease in flood damage'andl
<br />or sedimentation. ' ,
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<br />4.
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<br />Evaluate the various methods for ,determining:evapo,tr'ilIJspi-
<br />ration rates of phreatophytes, as to accuracy, cost, prac-
<br />:ticabilityj efficiency ilnd the extrapolatiol1 of the' results
<br />for 'l/'arying conditions' of climate, 'water table, and cover' '
<br />density. A corollary to' this would be the method of expres-
<br />sing these rateB that is depth ofwatetover' a unit area;';
<br />or' as a quantity 'of water per a u~itof, foliage volume,
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<br />5.
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<br />Evaluate the efficiency of the various control methods
<br />(~chanical, chemical, biological, ot\i.er), ilp.,d develop field
<br />cost figures.
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<br />6.
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<br />rhve'Stigate the benefiCial uses of phreatophytes, such as
<br />,control' of streambank and ,wind erosion,' habitat for'wild-
<br />life, effect on sport fishing,'tecteatiol1 facilities (parks,
<br />piCt\ic a'reas, roadside, re6t',areas) and commerciahproducts.
<br />(We know'saltcedar is high" in'oxalic', acid, and mesquite
<br />makes excellent charcoal', and thilt' latex'mily be' obtained
<br />from rabbit-brush). (Would it be feasible to raise and
<br />harvest phreatophytes as a crop for some valuable produce?)
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<br />7.
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<br />Study the increased reservoir longevity through decreasing
<br />sediment 'deposition. Phreiltophytes growing in the delta
<br />areas act as a partial barrier t.o'reduce the velocity, of'
<br />sediment-laden flood flows, and cause the sediment to be
<br />deposited in the area of growth, rather than in the
<br />reservoir.
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