Draw a sketch of the solution (11.4) for values of r/R from 0.001 to 1. The value 0.001 applies to the value r = rw, where rw is the radius of the tube through which the water is being produced. Assume that h0 = 20 m, H = 10 m, and Q0/2πkH = 1 m. What is the limiting value of the head when the radius of the tube is very small, rw → 0?