Put in the siphon drain, the beavers won't realize that it's a drain. Wait until the pond water is below the old drain, then pour in dry red bag concrete mix down the standpipe. It will harden by itself without mixing once water gets to it. It's used to set mailbox posts, etc.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).