I have found drains mainly used for forage ponds and commerical operations. The catfish raisers and fee fishing places need to periodically drain the ponds, either partially or completely, for health reasons. For commercial reasons, they pretty well overstock and then remediate.

It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

Without a sense of urgency, Nothing ever gets done.

Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP Grandpa