Pond pump size -- need to pump 12-15,000 gph with HIGH HEAD

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I am in advanced stages of planning a water garder in orlando florida.unable to decide the pump as i am unsure of actual TDH -- i would have a 5000 gallon and a bog which needs to a pump to water from the bog to top of a aquascape biofall grande -- the challenge is the waterfall is 70-75 feet away and 7 to 8 feet high -- the land follows a natural decline allowing a beatiful strem from the fall to the pond but distance and height from the bog to fall is messing up the pump head --- can someone suggg a cost effective way to overcome this.??
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