- The term derivation has other meanings, see derivation .
Derivation (from the Latin. Derivatio - lead, deviation) in hydraulic engineering - diversion of water from the river bed for various purposes along the canal  or the system of water conduits.
In a broader sense, derivation is understood as a set of hydraulic structures that divert water from a river, reservoir or other reservoir and bring it to other hydraulic structures  .
These types of derivational structures are distinguished - free- flow (channel, tunnel, tray) and pressure (pipeline, pressure tunnel). Pressure type is used if there are significant (more than a few meters) seasonal or temporary fluctuations of the water level at the place of its intake.
Modern diversion canals and watercourses have a length of tens of kilometers and a carrying capacity of several thousand m³ / s.
Examples of diversion channels
- Skhodnensky derivational canal
- In this case, the channel is called the derivation channel .
- Hydropower station (HPP), pumping station, distribution system of canals, etc.
- Derivation - an article from the Great Soviet Encyclopedia .