Groundwater Wells and Pumps

In unsteady radial flow to a well, Cooper-Jacob approximation is valid when the Theis parameter $u$ satisfies:

Options:

• (A) $u < 0.05$ (or $u < 0.01$)
• (B) $u > 10$
• (C) $u = 1.0$
• (D) $u > 100$