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<br />4 <br /> <br />The second factor concerns man-made modifications, In areas where <br /> <br />shallow basins are separated by low divides, construction of roads <br /> <br />and canals can either subdivide single basins or unirnbasins that <br /> <br />previously were separate, \-lith the large number of roads and .canals <br /> <br />in the thesis area, it was not practical to assess the extent to <br /> <br />which man's activities have modified the basins. Users of the.se <br /> <br />maps should be a~are of these uncertainties. <br />