This module uses screencasts and an interactive simulation to derive equations for hydrostatic pressure on submerged and partially submerged surfaces.. The screencasts are used to show how to setup and force balance on submerged surfaces. An interactive simulation and example problems allow the user to test themselves. We suggest using the learning resources in the following order:

  1. Attempt to answer the multiple-choice ConcepTest and solve the example problem before watching the screencasts or working with the simulation.
  2. Watch the screencasts that describe force balances on submerged surfaces and answer the questions within the screencasts.
  3. Use the interactive simulation to further understand the forces acting on a submerged gate and a partially submerged gate.
  4. Try to solve the two example problems before watching the solutions in the screencasts.
  5. Answer the ConcepTests.

Determination of hydrostatic pressure on submerged surfaces is essential for designing structurally stable storage tanks, reactors, and other hydraulic surfaces.

          This module is intended for Fluid dynamics courses.

Before studying this module, you should be able to:

  • Calculate hydrostatic pressures.
  • Do a force balance.
  • Calculate moments of inertia and centroids.

After studying this module, you should be able to:
  • Calculate the forces on a submerged surface.
  • Calculate the center of pressure on a surface.
  • Determine forces needed to hold a rotating or hinged gate in place.