In Aqueduct and Syphon Aqueduct, canal is carried over natural drain. In level crossing and inlet and outlets, canal water and drainage water are allowed to intermingle with each or.

In canal syphon and syphon aqueduct, canal water flows under symphonic action. The canal and drainage system approach each or practically at same level in CD works like Level crossing and inlets and outlets.

In Aqueduct, drainage water runs below canal eir freely or under symphonic action. In Super passage, drain is taken over canal such that canal water runs below drain. Similarly, a syphon is also a reverse of aqueduct syphon.

For siphoning higher discharges, horseshoe-shaped, rectangular or circular barrels are adopted. For siphoning small discharges, precast RCC pipes are adopted.

Level crossing is generally adopted when canal and drainage are practically at same level and for high flood drainage discharge but short-lived. Aqueduct or super passage is adopted when high flood drainage discharge is large.

The structure allows drainage water to enter canal and get mixed with canal water. It helps in augmenting canal supplies. It is adopted when high flood drainage discharge is small.

This is a type of cross-drainage works in which canal water and drain get intermixed. The arrangement is generally adopted when a huge canal crosses a large torrent carrying a high short-lived flood.

The uplift pressure on floor of aqueduct is caused due to seepage of water from canal to drainage and sub-soil water table in drainage bed. The drain bed of aqueduct is generally depressed and provided with pucca floor.

In this arrangement, canal is above ground hence it is open to inspection. The damage done by light floods is rare. The CD works are less liable to damage than earthwork of canal when canal passes below drainage.

In level-crossing, a regulator is provided across drainage to control discharge. When re are no floods torrent regulator is kept closed and during floods, regulator is opened so as to pass flood discharge.