Need advice on building a highbanker

[Huelten]

I currently have a 10x36 proline sluice that I am going to be converting to a highbanker. This will be my first experience with highbanker as all I've used are stream sluices. My question is regarding the water pump that will be needed for the highbanker. I'm going to use a 12v submersible pump, currently I own a 1250 gph pump. Is that to small to run enough water? If so, some advice on what gph I need to run would be greatly appreciated. I'm set on a 12v pump and not a gas pump however

 

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[SusanMN]

You'll have better luck getting responses if you post on the gold prospecting boards.