Just to refresh your memory, here's what Dam 1.0 looked like.
This solution worked well enough, but if you know me, you know I am the kind of person that doesn't accept "well enough". I am constantly striving for prefection.
Introducing "Dam 2.0"
As you can see, we've added the second tube, which allows for more water into the pond, connected to a complex system of pressure treated wood and nine screws. All held together with a tube of caulking.
I know I can always fall back on my civil engineering degree!
Heavy rains yesterday were a great test for Dam 2.0. The water below the dam is forced into the pond, while the rest of the water is free to flow into the brook! It can't fail.
And if it does, I know who I can get to take the fall.