Can anybody help me figure how many gallons per minute will flow thru both a 10 inch and 12 inch penstock that is 22 feet long that has a 6 foot 8 inch head without any turbine? The penstock will have one 90 degree bend and a 3 foot draft tube. I trying to determine what size will be ideal to replace the existing 8.25 inch penstock before i size a turbine that sizes the penstock. Thanx
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