For cross-drainage works, which of the following statement is true?
1
Aqueduct are cross drainage work in which high flood level of drainage remains lower than the level of the underside of the canal trough.
2
Siphon Super passage has an irrigation canal passes over the drainage
3
In level crossing cross drainage work consist two regulators and two weirs
4
Superpassage is the cross drainage work in which drain flows at atmospheric pressure over the work.