Whistler,I do not mess with the water level,till I am done trapping.I also ask all landowners and others where I trap,not to mess with the levels.
Unplugging the pipe will lower your levels,but they will also force the beavers to plug them again.This will give you huge up and down fluctuations of your water levels.Makes for harder trapping and a less efficient job.
Give me stable water levels any time.
If you need any help,let me know.
Tom