Conceptest: Permeability and Cone of depression
Two wells (A and B) are drilled into rocks that have the same porosity, but the rocks around well A have a higher permeability than these around well B. Suppose both wells are pumped at the same rate. Which statement is true?
b. Well B will have a larger cone of depression.
c. The cone of depression will be the same for both wells.
These responses were collected from students (mostly freshmen, non-majors) in multiple large Earth Science classes (60+ students) at an open-enrollment, Midwestern university. N=145 students on first attempt; 133 after peer instruction.
a. 39% of students selected this answer on their first attempt; 27% after peer instruction.
b. 53% of students selected this answer on first attempt; 71% after peer instruction. (correct)
c. 8% of students selected this answer on first attempt; 2% after peer instruction.