There is few tricks you can try get most of the water out of the conduct
1} use shop vaccum to suck much water as possible
2} use the compressed air to blow the water out [ make sure no one is standing on the oppstite end other wise will get soaked from " fontaion " or shower ]
but dont expect to get all of the water out of the conduct 100 percent of it espcally if run in UG set up
Merci , Marc