This diagram shows a place underlain by uniform materials.What is the approximate average gradient (slope)of the water table in this location? The vertical exaggeration on this diagram is 10x.
A) less than 20 m/km
B) 20 m/km
C) 100 m/km
D) 200 m/km

Question

This diagram shows a place underlain by uniform materials.What is the approximate average gradient (slope)of the water table in this location? The vertical exaggeration on this diagram is 10x. 
A) less than 20 m/km 
B) 20 m/km 
C) 100 m/km 
D) 200 m/km

Quizplus · Accepted Answer

The water table follows a gentle curve, suggesting a gradual slope. From the scale, we can see that the distance from the highest point to the lowest point of the water table is approximately 1 km, while the vertical exaggeration is 10x. This means that the actual change in elevation is only 100 m. Therefore, the approximate average gradient of the water table in this location is less than 20 m/km.

This Diagram Shows a Place Underlain by Uniform Materials