The following details pertain to the crossing of a canal and a drain. Bed level of Canal = + 211 m; Full Supply depth of Canal = 1.8 m; Bed level of Drain = + 209.4 m; depth of flow at High Flood Level = + 2.2 m. The suitable type of cross drainage work is:
1
Syphon Aqueduct
2
Canal Syphon
3
Super Passage
4
Aqueduct