They had said to use 3" pipe. See I didn't know you could run all that off of one pump - as I said pumps are a major blind spot in this build for me.
The waterfall is luckily taken care of - before the pond drained on it's own - the waterfall was working perfectly fine with it's own pump... I'm not going to mess with it.
There isn't currently a retaining wall in the bog there, I just wrote like that so that my contractor knows to fill it in there with dirt for about two feet to separate the bog and the rest of the pond. This has been really challenging because we are really working backwards on the design... The pond right now is a bowl and at it's deepest 7 feet... probably by the bog it's 5 ft but they are starting on bring the rocks that I have on the site down on Monday and building the french drain so I have to figure it all out pretty soon
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KEEP IN MIND YOU WILL WANT TO TRY AND KEEP WATER RUN Off from getting in the pond. it will add nutrients and pollutions. and unless your solely on sand you may entertain a under liner pipe or two to prevent the hippo.
a 8000 gph pump is not 2.7 hp and that sounds like a huge energy pig if it is but pumps can be mind blowing , hydronics is not a simple engineering field.
my 12000 is only a one hp