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<br />Figure 1. Map showing location of sIudy area. sewage-treatment facilities, major washes,
<br />and other pertinent geographic features ..,.,',.""""""..",...,..", 2
<br />
<br />2. Graph showing relation between population growth in Las Vegas Valley and
<br />sorface-water outflow to Las Vegas Wash .....,..".",........,....",.. 5
<br />
<br />.'"
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<br />3. Map showing location of D-14 detention basin with respect to Las Vegas Wash,
<br />f1oodways. areas dominated by hydrophytes, and other geographic features ......... 6
<br />
<br />4. Map showing location of observation wells .......,.....,...."..,.......... 9
<br />
<br />5. Hydrogeologic section along line W- Y, showing generalized distribution
<br />of horizontal hydraulic conductivity on basis of slug-test data for cluster wells . . , . . . . 15
<br />
<br />6. Graph showing relation between volumetric water content and hydraulic head for
<br />cores taken from zone of water-table fluctuation at selected cluster-well sites . , . . . , . , 16
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<br />7. Map showing water-table contours for March and September 1986, which depict
<br />effects of pumping and evapotranspiration ...,..................,....,.... 18
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<br />8. Hydrographs showing seasonal water-level fluctuations in areas of hydrophytic
<br />
<br />vegetation ...................................................... 20
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<br />9. Hydrographs showing seasonal water-level fluctuations in areas of phreatophytic
<br />
<br />vegetation ......,....".........................".............. 21
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<br />10. Hydrogeologic section along line W-Y, showing average water-table
<br />altitude and distribution of average dissolved-solids concentrations in 1986-87 ....... 24
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<br />11. Hydrogeologic sections along line W-z, showing contrast between vertically
<br />exaggerated and unexaggerated projections . . . . . . . . . . . . . . , , . . . . , . . . . . . . , . , . 26
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<br />12-14. Diagrams showing:
<br />
<br />12, Planimetric finite-elemenr grid used for model that simulates ground-water flow,
<br />and simulated water-table configuration under steady-state conditions without
<br />dike and hypothetical slurry wall . . , . . . . . . . . . . , . . . , . . . . , . . . , , , . . . . . 30
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<br />13. Simulated planimetric water-table configuration and resulting flow
<br />pattern for steady-state conditions, assuming a vertically infinite no-flow
<br />boundary coincident with location of dike and hypothetical slurry wall ...,... 32
<br />
<br />14. Simulated planimetric water-table configuration and resulting flow
<br />pattern for steady-state conditions, with dike and hypothetical
<br />slurry wall in place ...,.".........,..,.".",.,...,.",...". 33
<br />
<br />] 5. Cross-sectional. finite-element grid used for model that simulates distribution of
<br />dissolved solids and ground-water flow ',...,...,.....,.."..,...,...".. 35
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