Abstract
The purpose of this chapter is twofold. The first one is to expose two methods that enable us to apprehend the problem of tanks and water towers by two different approaches: The first is a simplified one by using approximate formulas. The second is shell theory whose resulting equations are more complicated and closer to reality because it takes into consideration curvilinear shape of the structure. The second objective of this chapter is to be able to understand the hydrodynamic study using Houzner's method, whose principle is to divide the contents of the tank into two parts: oscillatory and impulse.