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pbng,
In your application a normal water pump probably would not work. The effective velocity of anything coming out of the spray bar from a normal pump would be siginificantly diminished and would probably not create the current you're looking for.
However, this may be a place where a prop pump would work if this was a zero head application. Do a seach here for prop pump and you should come up with a couple of links and references. Prop pump can move alot of water and that may be your only chance to overcome the friction losses caused by a spay bar type device.
-Dan
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