Which is NOT correct about cross drainage works?
1
Aqueduct - canal water flows above the natural drainage and the HFL of the drain is well below the bed of the canal.
2
Superpassage - Natural drain is carried over the canal and FSL of the canal is wall below the bed of the drain.
3
Syphon Aqueduct - Canal water flows above the natural drainage and the HFL of the drain is above the bed of the canal.
4
Syphon - Canal water flows above the natural drainage and the HFL of the drain is well below the bed of the canal.