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Building a small mound for my stackable waterfall

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Any tips? I have a small pond with 4 stackable artificial stone waterfalls. I previously stacked these with bricks but they got knocked down and I've woke up to an empty pond a couple times. I'm been advised to build a mound but want a few tips.
I can just use soil but want to make sure it doesn't erode away when it rains. Will it be sensible to cover it with a waterproof liner? 
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