Canal Escape Function Explained

The question asks to identify the specific canal structure used for removing surplus water from a canal and directing it into a natural drain. This function is crucial for preventing canal breaches and damage caused by excessive water levels.

Understanding Canal Structures

Let's examine the function of each option provided:

• Canal Regulator: These structures are typically installed at the head of a canal or at important junctions. Their main purpose is to control the flow of water into the canal or its distributaries, often regulating the supply based on demand. They are not primarily designed for discharging excess water into drains.
• Canal Fall: A canal fall is constructed where a canal passes from a higher ground level to a lower ground level. Its function is to dissipate the excess energy of the flowing water safely, preventing erosion of the canal bed and banks. It manages the vertical drop in water level, not the removal of surplus water into drains.
• Canal Outlet: Canal outlets, also known as modules, are structures built to take water out of the main canal to supply it for irrigation purposes to a specific area or watercourse. They are designed for water distribution, not for emergency discharge of surplus water.
• Canal Escape: A canal escape structure is specifically built to provide a safe passage for discharging surplus water from the canal directly into a natural drain, river, or another less critical channel. This is essential for regulating the water level in the canal, especially during heavy rainfall or when the demand decreases suddenly, thereby protecting the canal system from overtopping and potential failure.

Conclusion on Canal Structures

Based on the functions described, the structure used to remove surplus water from a canal into a natural drain is the canal escape.