Glad that you found my thread, Stevie
I can't really guess the gallonage, but the pond is probably 4 feet wide, 7 feet long, and 2.5 feet deep.
It does have a filtration unit within the pump for the waterfall.
I'll go ahead and ask the landscape architect again about the Koi to double check.
Also, is there any sence in collecting frogs/tadpoles or will they find the pond for sure? It's probably 75 yards from the creek, uphill, so they might not...
Thanks for any info.
-Tim