# Problem 8 Solution

**Question:** The figure shows a map view of a lake and shoreline. The water table elevation at Well A is 12 m. Assuming the water table is planar (an inclined plane), what is the expected water level elevation in Well B?

a) 12

b) 13

c) 14

d) A value between 12 and 13

**Solution:** The water level in the lake is horizontal. Therefore, the head is the same everywhere in the lake, including along the length of the lake-shoreline interface. Since flow is orthogonal to equipotential lines and the water table is assumed planar, the contour interval of 2 m is extrapolated upgradient, thereby resulting in a water level of 14 m at Well B.