Hydrodynamics - when water starts to flow
Hydrodynamics is the study of water flow. This is more complex than hydrostatics because several additional factors must be taken into account, namely, velocity, direction of flow and viscosity. Hydrodynamics provides the link between pressure, velocity and the size of pipes and channels that carry the flow. How large must a channel be to carry water from a dam to an irrigation scheme? What diameter of pipe is needed to supply water to a small town? What kind of pumps might be required and how large must they be? These are the practical problems of hydrodynamics.