A cross drainage work provided when the canal runs below the drain with the Full Supply Level (FSL) of the canal well below the bed of the drain is called a Super Passage.


A super passage is a type of cross drainage work that is constructed when the canal has to pass below the drain and the Full Supply Level (FSL) of the canal is significantly below the bed level of the drain. It is designed to allow the drain to pass over the canal without any obstruction or interference.

Features and Construction of Super Passage:

- A super passage consists of a masonry or concrete structure built across the drain to provide a clear passage for the drain over the canal.
- The structure of the super passage is typically in the form of a rectangular or circular shape, depending on the design requirements.
- The dimensions and shape of the super passage are designed based on various factors such as the size of the drain, the flow of water, and the difference in levels between the canal and the drain.
- The structure is designed to withstand the hydraulic pressure exerted by the flow of water in the drain and to ensure the stability and safety of the canal.
- The super passage is constructed with proper foundations and abutments to support the structure and prevent any settlement or failure.
- The flow of water in the drain is not affected by the presence of the super passage, and it can continue to flow smoothly without any obstruction.
- The super passage may also include provision for an access road or pathway for maintenance and inspection purposes.

Advantages of Super Passage:

- Allows the drain to pass over the canal without any interference or obstruction.
- Ensures the smooth flow of water in the drain.
- Provides a safe and stable structure to support the canal.
- Allows for easy maintenance and inspection of the canal.

In conclusion, a super passage is a cross drainage work that is constructed when the canal runs below the drain with the FSL of the canal well below the bed of the drain. It provides a clear passage for the drain over the canal, allowing the smooth flow of water and ensuring the stability and safety of the canal.