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V'< < IU Ino , IOrAl trU No JS 14 r IJ/�4 <br /> water body within the separating stream surface is captured by the UVB, and that outside <br /> of it, which flows from upstream, passes the well. <br /> In Figure 5 the outer surface of the capture zone, calculated numerically, and the <br /> surrounding horizontal aquifer bottom and aquifer top are plotted for two situations (the <br />' natural groundwater flows from the background at the right side to the UVB, as shown <br /> by the vectors). Figures 5a and 5b were calculated for the situation described for Figure <br /> 3b; the only difference is that for Figure 5a the vertical hydraulic conductivity is Kv = <br /> 0.001 m/sec, which means the calculation is performed for isotropic conditions. The <br /> figures have a visible basis area of 50 m • 50 m (Fig. 5a) and 100 m - 50 in (Fig. 5b). <br /> use <br /> 4 <br /> KH= Kv=0 0 01 m/s <br /> lb} Uve <br /> M KH=0001 m15 <br /> K„= 00001m/s <br />' Figure 5. Separating stream surface of the capture zone for the situation of Figure 3b: <br /> (a) Kii = 0 001 m/sec (isotropic); (b� anisotropic K,j/Kv = 10. <br /> The captured water is cleaned within the well and ]eaves it through the upper <br /> screen section in all directions (not shown in Fig. 5). Parts of it are again captured by the <br />' lower screen section, and the rest flows directly downstream. <br /> If a wide plume of contaminated groundwater 1s to be cleaned, one UVB might <br /> not be enough to capture the whole plume Different UVB installations can be arranged, <br /> for example, in one line normal to the natural flow An important question concerns the <br /> maximum distance that allows no contaminated water to flow between two neighbouring <br /> wells without being cleaned. Figure 6 demonstrates such an example for the situation of <br />