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Message: [QUOTE="Marinegrunt, post: 318986, member: 8922"] I wish I would've drawn up a plan. I already have everything dug. The upper tiny pond, waterfall, stream, and main pond which is about 8x13. I already install and buried the 3" drain pipe. It rained like mad last night so everything is a mess. I have to whole yard torn up right now to level and add new top soil so everything is a mess! If the 3" is enough flow would I be okay using a smaller pump from barrels going right back to the big pond and the just using the 4500 pump directly from the bottom of the big pond up to the small pond for the waterfall and stream? Seems it might be easier to adjust waterflow that way. One thing about the original way is when I shut the pump off all of the water from the falls and stream will run down and add all of that extra water to the barrels. I guess I could put an overflow on the barrel so when the pump is off that extra water just just keeps flowing back to the pond. Right now the 3" pipe comes out about 2 to 3' lower than the top of the pond. I could adjust the height of it up or down to speed up or slow down flow. I read somewhere that a 10" drop allows something like 12000 gph worth of flow. I also read on here where Waterbug said the flow rate of a bottom drain is exactly the same as the water your pumping in. Considering I already have the 3" pipe dug in I guess I can just go with it and see what happens. Worst case I can just control the flow after the pump as Meyer mentioned. If I need more water flow for the waterfall and stream I can add another pump to the main pond and plumb it directly to the upper pond. [/QUOTE]

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