Are you guys doing the math on the flow of water at peak on the elbow and doing the math on how quickly it would fill a reservior? Shouldn't it be something like half of peak flow? There's an amount that can safely flow through the elbow, so the rate at which the reservior fills shouldn't be the entire flow (if that's how you're doing your math). It's not like the elbow will be dry while the reservior fills.
Need to figure out the capacity that the Elbow can handle (and the bow I guess) and then subtract that from peak flow and use that flow rate for your reservior fill rate.
I think. . .
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