Pronunciation: [tˈe͡ɪlɹe͡ɪs] (IPA) 
The word "tailrace" is a commonly used term in engineering and refers to the channel or tunnel that carries water away from a waterwheel or turbine. The correct spelling of this word is /teɪlreɪs/. The "t" sound is followed by the long "a" vowel sound, represented by the letters "ai", and the stress is on the second syllable. The final "e" is silent and acts to indicate that the preceding "a" is pronounced as a long vowel sound.
A tailrace refers to a channel or watercourse constructed to carry away the water that has passed through a turbine or waterwheel in a hydroelectric power plant, a mill, or other similar industrial facilities. Also known as a tailwater, it is an essential component of such systems as it ensures the proper functioning and efficient operation of the machinery.
The tailrace is typically located downstream from the power plant or mill and is designed to regulate the flow of water discharged from the turbines or waterwheels. This discharged water passes through the tailrace and is directed back into a natural water body, such as a river or stream, returning it to its original flow.
The construction and management of a tailrace involve careful engineering considerations, including ensuring proper water flow, preventing erosion or sediment buildup, and maintaining ecological balance in the water body to avoid environmental impacts. The shape and size of the tailrace are designed to minimize energy losses and maintain adequate water velocity.
In addition to its functional role, the tailrace may also serve as a fishing or recreation area, depending on its location and accessibility. Overall, the tailrace constitutes an integral part of harnessing water power for electricity generation or industrial processes, providing a controlled discharge of water for continued operational efficiency while ensuring minimal environmental disruption.
The word "tailrace" originated in the early 19th century. Its etymology stems from the combination of two terms: "tail" and "race".
The term "tail" refers to the back end or the lower part of something, typically the end opposite to the head. In this context, it specifically refers to the lower end or exit point of a channel built for water to flow through.
The word "race", in this case, does not refer to a competition but rather to a channel or course that the water flows through. The term can be traced back to Old English and Old Norse, where it originally meant a running or flowing, referencing water or other fluids moving swiftly through a channel or course.
Therefore, the word "tailrace" describes the lower part or exit channel through which water or other fluids flow swiftly, typically created as a result of a dam or other water-related engineering structures.
