Quote:
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Originally Posted by Mama Bear
How can I do this, so as to keep the water pressure from pushing the
blocks over, and still make the water flow over the top in a nice little
waterfall?
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- Mama Bear
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I'd buy solid block and cut them to the shape of arch stones, ie wedge like, them build them in a curve like the hoover dam. A 9" diamond edged stone cutting disc in a 9" angle grinder would make short work of the cutting and the discs are cheap, about £19 here