Definition

1. Noun:
   • A gate at the lower end of a lock or canal: A "tail gate" is a type of gate located downstream, used to regulate or stop the flow of water at the lower end of a lock chamber or canal section.

Usage

• The term "tail gate" is a technical noun used primarily in the context of hydraulic engineering, navigation, and water management. It refers specifically to the gate controlling the exit point of water.

Examples

• Noun:
  • The lockkeeper closed the tail gate to begin filling the chamber.
  • Water rushed out when the tail gate was opened.

Advanced Usage

• "tail gate" vs. "head gate": In lock systems, the "head gate" controls water at the upper end, while the "tail gate" controls it at the lower end. The "tail gate" is crucial for maintaining the water level differential needed for boats to pass through.

Variants and Related Words

• Tailgate (one word, common variant): This is the more common, closed-form spelling for the noun describing the downstream gate of a lock. It is also the standard spelling for the rear door of a vehicle.
  • The canal's tailgate was made of heavy timber.
• Tailrace: The channel that carries water away from a waterwheel or turbine, often located downstream from a tail gate.

Synonyms

• Lower gate: A direct synonym often used in engineering contexts.
• Downstream gate: A descriptive synonym emphasizing its location.

Notes on Meaning

• This definition is distinct from the more common term "tailgate" (one word) referring to a vehicle's rear door or a social event. The two-word form "tail gate" specifically denotes the water-control structure. In modern usage, the single word "tailgate" is often used for both meanings, but the technical engineering context may preserve the two-word form for clarity.

Noun

1. a gate downstream from a lock or canal that is used to control the flow of water at the lower end