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A hydraulic structure is constructed when the Full Supply Level (FSL) of a canal is much higher than the High Flood Level (HFL) of the stream which in turn, is lower than the bottom of the canal trough is called:

A hydraulic structure is constructed when the Full Supply Level (FSL) of a canal is much higher than the High Flood Level (HFL) of the stream which in turn, is lower than the bottom of the canal trough is called: Correct Answer aqueduct

Explanation:

Cross-drainage works:

A cross drainage work is a structure that is constructed at the crossing of a canal and a natural drain. To dispose of drainage water without interrupting the continuous canal supply.

Types of cross drainage work:

(i) When canal passes over Drainage:

(a) Aqueduct: HFL of the drain sufficiently below the bottom of the canal.

(b) Syphon aqueduct: HFL of the drain is above the bottom of the canal.

 

 

(ii) When canal passes below drainage:

(a) Super passage: The FSL of the canal is well below the bottom of the drain

(b) Canal syphon: FSL Of canal is above the bottom of drain.

 

 

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