• Due to high rate of pumping, sometimes, level of water in a confined aquifer depresses below the top of the confined aquifer as shown in Fig. 7.11. In such a

Fully penetrating artesian gravity well.

  • case the flow pattern near the well, upto the point (A) where draw down curve cuts the top of confine aquifer behaves  gravity well. Beyond point A the flow from the well is artesian flow.
  • This type of well is known as a combined artesian-gravity well.
  • The flow from such a well  found out using the following formula given by Muskat.

\[Q= \frac{\pi k (2bh-b^{2}-h^{^{2}})}{log_{r}\frac{R}{r}}\]