(Answered): b. Figure 3.32 is a map showing the ground-water elevations in wells screened in an unconfined aqui ...

b. Figure 3.32 is a map showing the ground-water elevations in wells screened in an unconfined aquifer in Milwaukee, Wisconsin. The aquifer is in good hydraulic connection with Lake Michigan, which has a surface elevation of 580 ft above sea level. Lakes and streams are also shown on the map 1. Make a water-table map with a contour interval of 50 ft, starting at 550 ft. 2. Why do you suppose that ground-water levels are below the Lake Michigan surface elevation in part of the area? I A ? Stream Water table contour Well 0 200 400 600 800 1000 meters ? FIGURE 3.31 Water-table map with the hydraulic gradient changing across the site. Where the contour lines are close together, the gradient is steeper than where they are farther apart. Note that the contour lines form the shape of a V where they cross a stream.