How to Siphon a Dam

Cheap and effective way to empty a dam / lower water level.

[@andyn5138]

Hi, do you need to have a valve on the lower end initially to allow for filling of the pipe up to the check valve? Or did you have a cap over the end until it was full to get the siphoning action happening? Also,does the t piece at the high point help to create a venturi effect? Thanks,Andy.

[@bappadityaraj8248]

How long water can be out from this system

[@mitchh1315]

We just run this system until the water level is low enough to do the work required. It’s a good controlled release so that anything downstream can handle the flow just like any heavy rain event. This dam (18ML) filled back up in 48 hours once we were finished.