The Ant Farm has a product called Hydro Locks. It's a great product -- I find myself using it a lot for various industrial scenes -- but it might not be the classic kind of dam you're looking for. Maybe a product called "Dam, reservoir" at Renderosity is closer to what you need (found just by searching Renderosity for "dam").
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well there is this https://www.renderosity.com/rr/mod/bcs/index.php?ViewProduct=142215&&
it's just a dam though not hydroelectric
The Ant Farm has a product called Hydro Locks. It's a great product -- I find myself using it a lot for various industrial scenes -- but it might not be the classic kind of dam you're looking for. Maybe a product called "Dam, reservoir" at Renderosity is closer to what you need (found just by searching Renderosity for "dam").
The one on Renderosity is just what I wanted. And the price is right. I purchased it this morning.