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Old 09-05-2009, 12:37 AM   #12 (permalink)
Bicycle Bob
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A dam can raise the water level close to your turbine, and provide a cushion for dry spells. However, it is nothing magic. If you figure out where an ideal dam would back the water up to, and just run a large-bore pipe from that elevation, you gain the same head-height, minus any dynamic loss from friction in the pipe. There are many on-line calculators for pressure loss in pipes.
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